86,622 research outputs found
Dataset for Impaired executive functioning in Brazilian boys with Duchenne muscular dystrophy
No full textExcel file with raw data with the genetic profile of Duchenne muscular dystrophy (DMD) participants and data the CANTAB tests results from DMD and control participants
Effects of bismuth vandate and anthraquinone dye on the photodegradation of polycarbonate
No full textBoth inorganic and organic compounds, such as oxides or salts of metals and polycyclic and azo compounds, are frequently used as colorants in polymeric systems. Bismuth vanadate pigment has been used as an environmentally friendly alternative for cadmium containing pigments and anthraquinone dyes represent a polycyclic colorant class of wide use in polymers. Besides their coloring properties, both bismuth vanadate and anthraquinone present photocatalytic activity or photochemical properties that can influence the mechanism and the kinetics of the photodegradation of the polymer into which they are incorporated. In this paper the influence of bismuth vanadate pigment and anthraquinone dye on the photodegradation of polycarbonate was evaluated. For this purpose, samples of polycarbonate containing the colorants were submitted to photochemical aging following the recommendations of ASTM G53. Bismuth vanadate accelerates the photodegradation of polycarbonate, causing a faster drop in the mechanical properties and an increase in the hydroperoxide concentration during the aging process. The coloring ability of the pigment is also affected. The photodegradation behavior of polycarbonate in presence of bismuth vanadate may be caused by a possible direct chemical reaction between pigment and polymer, promoted by UV radiation. On the other hand, the presence of anthraquinone dye seems to stabilize the polycarbonate against photodegradation through a deactivation mechanism of the excited state
Influence of copper-phthalocyanine on the photodegradation of polycarbonate
No full textDyes and pigments are extensively used in polymer materials to confer colour-changing properties. However, these additives can significantly affect polymer stability against degradation. While the mechanism of stabilization of polymers by some pigments, such as carbon black, has been studied and is well known, the action of chromatic colorants, mainly in the sensitization of the degradation process, remains unclear. Cu-phthalocyanine dye can stabilize polymers against degradation as well as accelerate degradation in other situations. Cu-phthalocyanine incorporated into polycarbonate resulted in an acceleration of the degradation when the material was submitted to photochemical aging. The possible mechanism to explain the photodegradative behavior of PC containing Cu-phthalocyanine is based on the hypothesis that specific interactions among excited states of PC and Cu-phthalocyanine take place and enhance the formation of reactive species in polycarbonate. Excited states of Cu-phthalocyanine may abstract hydrogen atoms from methyl groups in polycarbonate, increasing the formation of free radicals P-., which are the starting points for the sequential photo-oxidation reactions that lead to the degradation of the polycarbonate. Electron transfer sensitization is also a possible mechanism: the excited state of Cu-Ph abstracts an electron from PC to form the Cu-Ph radical anion and the PC radical cation. These reactive species in the presence of oxygen can cause oxidation of the aromatic ring. (c) 2006 Elsevier Ltd. All rights reserved
Effect Of In Situ Polymerization Conditions Of Methyl Methacrylate On The Structural And Morphological Properties Of Poly(methyl Methacrylate)/ Poly(acrylonitrile-g-(ethylene-co-propylene-co-diene)-g-styrene) Pmma/aes Blends
No full textIn this study, the structural and morphological properties of poly(methyl methacrylate)/poly(acrylonitrile-g-(ethylene-co-propylene-co-diene-g-styrene) (PMMA-AES) blends were investigated with emphasis on the influence of the in situ polymerization conditions of methyl methacrylate. PMMA-AES blends were obtained by in situ polymerization, varying the solvent (chloroform or toluene) and polymerization conditions: method A-no stirring and air atmosphere; method B-stirring and N 2 atmosphere. The blends were characterized by infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and dynamic mechanical analysis (DMA). The results showed that the PMMA-AES blends are immiscible and present complex morphologies. This morphology shows an elastomeric dispersed phase in a glassy matrix, with inclusion of the matrix in the elastomer domains, suggesting core shell or salami morphology. The occlusion of the glassy phase within the elastomeric domains can be due to the formation of graft copolymer and/or phase inversion during polymerization. However, this morphology is affected by the polymerization conditions (stirring and air or N 2 atmosphere) and by the solvent used. The selective extraction of the blends' components and infrared spectroscopy showed that crosslinked and/or grafting reactions occur on the elastomer chains during MMA polymerization. The glass transition of the elastomer phase is influenced by morphology, crosslinking, and grafting degree and, therefore, T g depends on the polymerization conditions. On the other hand, the behavior of T g of the glassy phase with blend composition suggests miscibility or partial miscibility for the SAN phase of AES and PMMA. © 2011 Wiley Periodicals, Inc.124428462856Poomalai, P., Ramaraj, B., Siddaramaiah, (2007) J Appl Polym Sci, 104, p. 3145Zheng, S., Guo, Q., Chan, C.M., (1999) J Polym Sci Part A: Polym Chem, 37, p. 2329Carvalho, F.P., Gonçalvez, M.C., Felisberti, M.I., (2010) Macromol Symp, 296, p. 596Soto, G., Nava, E., Rosas, M., Fuenmayor, M., González, I.M., Meira, G.R., Oliva, H.M., (2004) J Appl Polym Sci, 92, p. 1397Lee, S.J., Jeoung, H.G., Ahn, K.H., (2003) J Appl Polym Sci, 89, p. 3672Estenoz, D.A., Leal, G.P., López, Y.R., Oliva, H.M., Meira, G.R., (1996) J Appl Polym Sci, 62, p. 917Sardelis, K., Michels, H.J., Allen, G., (1987) Polymer, 28, p. 244Casis, N., Estenoz, D., Gugliotta, L., Oliva, H., Meira, G., (2006) J Appl Polym Sci, 99, p. 3023Cheng, S.-K., Chen, C.-Y., (2003) J Appl Polym Sci, 90, p. 1001Lourenço, E., Felisberti, M.I., (2007) J Appl Polym Sci, 105, p. 986Zheng, S., Li, J., Guo, Q., (1997) J Mater Sci, 32, p. 3463Lourenço, E., Gonçalves, M.C., Felisberti, M.I., (2009) J Appl Polym Sci, 112, p. 2280Lourenço, E., Felisberti, M.I., (2008) J Appl Polym Sci, 110, p. 1804Larocca, N.M., Hage Jr., E., Pessan, L.A., (2004) Polymer, 45, p. 5265Saron, C., Felisberti, M.I., (2004) Mater Sci Eng A, 370, p. 293Lourenço, E., Felisberti, M.I., (2006) Polym Degrad Stab, 91, p. 2968Suess, M., Kressler, J., Kammer, H.W., (1987) Polymer, 28, p. 957Kumaraswamy, G.N., Ranganathaish, C., Urs, M.V.D., Ravikumar, H.B., (2006) Eur Polym J, 42, p. 2655Kressler, J., Higashida, N., Inoue, T., Heckmann, W., Seitz, F., (1993) Macromolecules, 26, p. 2090Bhanu, V.A., Kishore, K., (1991) J Am Chem Soc, 91, p. 99Turchet, R., Felisberti, M.I., (2006) Polímeros: Ciência e Tecnologia, 16, p. 158Garcia, M.F., Martinez, J.J., Madruga, E.L., (1998) Polymer, 39, p. 991Carraher Jr., C.E., (2003) Polymer Chemistry, , 6th ed. Marcel Dekker: New YorkMoad, G., Solomon, D.H., (2006) The Chemistry of Radical Polymerization, , Chapter 6 2nd ed. Elsevier Science: San DiegoBasu, B.S., Sen, J.N., Palit, S.R., (1950) Proc R Soc London A, 202, p. 485Bae, Y.O., Ha, C.S., Cho, W.J., (1991) Eur Polym Mater, 27, p. 121Alias, Y., Ling, I., Kumutha, K., (2005) Ionics, 11, p. 414Meira, R.G., Luciani, C.V., Estenoz, D.A., (2007) Macromol J, 1, p. 25Duin, M.V., Dikland, H.G., (2003) Rubber Chem Technol, 76, p. 132Grassi, V.G., Forte, M.M.C., Pizzol, M.F.D., (2001) Polímeros: Ciência e Tecnologia, 11, p. 158Sideridou, I.D., Achilias, D.S., Karava, O., (2006) Macromolecules, 39, p. 2072Leal, G.P., Asua, J.M., (2009) Polymer, 50, p. 68Choi, J.H., Ahn, K.H., Kim, S.Y., (2000) Polymer, 41, p. 5229Grego, R., Malinconico, M., Martuscelli, E., Ragosta, G., Scarinzi, G., (1987) Polymer, 28, p. 1185Rottela, D.C., (2011) Master Dissertation, Institute of Chemistry, , University of CampinasXu, F.Y., Chien, J.C.W., (1994) Macromolecules, 27, p. 6589Carvalho, F.P., Quental, A.C., Felisberti, M.I., (2008) J Appl Polym Sci, 110, p. 880Turchet, R., Felisberti, M.I., (2005), Br, PI. 0305588-4Lourenço, E., Gonçalves, M.C., Felisberti, M.I., (2009) J Appl Polym Sci, 113, p. 2638Bates, F.B., Cohen, R.E., Argon, A.S., (1983) Macromolecules, 16, p. 110
Pmma-aes Blends Prepared By In Situ Polymerization
No full textBlends of poly(methyl methacrylate) (PMMA) and poly(acrylonitrile-g- (ethylene-co-propylene-co-diene)-g-styrene) (AES) were prepared by in situ polymerization. AES, a commercial elastomer obtained by radical copolymerization of styrene and acrylonitrile in the presence of ethylene-propylene-diene terpolymer (EPDM), was dissolved in methyl methacrylate and the in situ polymerization was conducted at 60 °C. The blends were characterized by CHN analysis, infrared spectroscopy (FTIR), carbon-13 nuclear magnetic resonance (13C NMR), dynamic mechanical analysis (DMA) and transmission electron microscopy (TEM). These blends are immiscible and present complex phase behavior. Selective extraction of the blends' components showed that a fraction of the material is crosslinked and grafting reactions on EPDM chains take place during MMA polymerization. Syndiotactic PMMA was obtained in the presence of AES and this syndiotactic-specificity increased with increasing amount of AES. The morphology of polymerized specimens showed irregular domains of elastomeric phase and in some cases inclusions of PMMA could be observed. Copyright © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.2961596608Ruckdäschel, H., Sandler, J.K.W., Altstädt, V., Rettig, C., Schmalzm, H., Abetz, V., Müller, A.H.E., (2006) Polymer, 47, p. 2772Corté, L., Leibler, L., (2005) Polymer, 46, p. 6360Poomalai, P., Ramaraj, B., Siddaramaiah, (2007) J. Appl. Polym. Sci., 104, p. 3145Zheng, S., Guo, Q., Chan, C.-M., (1999) J. Polym. Sci., Part A: Polym. Chem., 37, p. 2329Zheng, S., Lin, J., Guo, Q., (1997) J. Mater. Sci., 32, p. 3463Lourenço, E., Felisberti, M.I., (2006) Eur. Polym. J., 42, p. 2632Lourenço, E., Felisberti, M.I., (2006) Polym. Degrad. Stab., 91, p. 2968Upreti, S.R., Sundaram, B.S., Lohi, A., (2005) Eur. Polym. J., 41, p. 2893Lalande, L., Plummer, C.J.G., Månson, J.-A.E., Gérard, P., (2006) Polymer, 47, p. 2389Borgreeve, R.J., Gaymans, R.J., Sehuijer, J., (1987) Polymer, 28, p. 1489Bucknall, C.B., Partridge, I.K., Ward, M.V., (1984) J. Mater. Sci., 19, p. 2064Cheng, S.-K., Chen, C.-Y., (2004) Eur. Polym. J., 40, p. 1239Larocca, N.M., Hage Jr., E., Pessan, L.A., (2004) Polymer, 45, p. 5265Saron, C., Felisberti, M.I., (2004) Mater. Sci. Eng., A, 370, p. 293Turchet, R., Felisberti, M.I., (2005), Br PI. 0305588-4Turchet, R., Felisberti, M.I., (2006) Polímeros: Ciência e Tecnologia, 16, p. 158Suess, M., Kressler, J., Kammer, H.W., (1987) Polymer, 28, p. 957Kressler, J., Higashida, N., Inoue, T., Heckmann, W., Seitz, F., (1993) Macromolecules, 26, p. 2090Feng, H., Feng, Z., Ye, C., (1996) Polym. J., 28, p. 661Kumaraswamy, G.N., Ranganathaish, C., Urs, M.V.D., Ravikumar, H.B., (2006) Eur. Polym. J., 42, p. 2655Duin, M.V., Dikland, H.G., (2003) Rubber Chem. Technol., 76, p. 132Bae, Y.O., Ha, C.S., Cho, W.J., (1991) Eur. Polym. J., 27, p. 121Alias, Y., Ling, I., Kumutha, K., (2005) Ionics, 11, p. 414Isobe, Y., Yamada, K., Nakano, T., Okamoto, Y., (1999) Macromolecules, 32, p. 5979Ferguson, R.C., Ovenall, D.W., (1987) Macromolecules, 20, p. 1245Wang, J.-S., Jérôme, R., Warin, R., Teyssié, P., (1993) Macromolecules, 26, p. 5984Hirano, T., Masuda, S., Nasu, S., Ute, K., Sato, T., (2009) J. Polym. Sci., Part A: Polym. Chem., 47, p. 1192Hirano, T., Miki, H., Seno, M., Sato, T., (2005) Polymer, 46, p. 3693Hirano, T., Ishii, S., Kitajima, H., Seno, M., Sato, T., (2005) J. Polym. Sci., Part A: Polym. Chem., 43, p. 50Xu, F.Y., Chien, J.C.W., (1994) Macromolecules, 27, p. 6589Keinath, S.E., Boyer, R.F., (1981) J. Appl. Polym. Sci., 26, p. 2077Carvalho, F.P., Quental, A.C., Felisberti, M.I., (2008) J. Appl. Polym. Sci., 110, p. 880Lourenço, E., Gonçalves, M.C., Felisberti, M.I., (2009) J. Appl. Polym. Sci., 113, p. 2638Lourenço, E., Gonçalves, M.C., Felisberti, M.I., (2009) J. Appl. Polym. Sci., 112, p. 2280Bates, F.B., Cohen, R.E., Argon, A.S., (1982) Macromolecules, 16, p. 1108Szabõ, P., Epacher, E., Földes, E., Pukánszky, B., (2004) Mater. Sci. Eng., A, 383, p. 307Mark, H.F., Bilakes, N.M., Overberger, C.G., (1998) Encyclopedia of Polymer Science and Engineering, , John Wiley & Sons, Inc., New YorkLeal, G.P., Asua, J.M., (2009) Polymer, 50, p. 68Lee, S.J., Jeoung, H.G., Ahn, K.H., (2003) J. Appl. Polym. Sci., 89, p. 3672Jagadeesh, K.S., Siddaramaiah, Kalpagam, V., (1990) J. Appl. Polym. Sci., 40, p. 1281Arayapranee, W., Prasassarakich, P., Rempel, G.L., (2002) J. Appl. Polym. Sci., 83, p. 2993Grassi, V.G., Forte, M.M.C., Pizzol, M.F.D., (2001) Polímeros: Ciência e Tecnologia, 11, p. 158Tillier, D.L., Meuldijk, J.J., Höhne, G.W.H., Frederik, P.M., Regev, O., Koning, C.E., (2005) Polymer, 46, p. 7094Klempner, D., Sperling, L.H., Utracki, L.A., (1994) Interpenetrating Polymer Networks, , 1° Ed., Ed. ASC, WashingtonInoue, T., Kobayashi, S., Chen, W., Ohnaga, T., Ougizawa, T., (1994) Polymer, 35, p. 401
Thermal, Mechanical And Electrochemical Behaviour Of Poly(vinyl Chloride)/ Polypyrrole Blends (pvc/ppy)
No full textThe conductivity, thermal, mechanical and electrochemical properties of poly(vinyl chloride)/polypyrrole blends are described in this paper. These blends were prepared by oxidative chemical polymerization of pyrrole, in the vapour phase, in PVC films impregnated with FeCl3. They were characterized by attenuated total reflectance FT i.r. spectra, differential scanning calorimetry and dynamic-mechanical analysis. Infrared reflectance spectra suggested that the polymerization occurs preferentially on the matrix surface producing sandwich-type structures. The mechanical, thermal and conducting behaviour showed a dependence on (1) initial concentration of FeCl3 in the matrix and (2) exposition time to pyrrole vapour. By cyclic voltammetry we observe that blends synthesized by oxidative chemical polymerization show electrochemical properties similar to blends prepared by electrochemical methods. Their conductivity varies from 10-4 to 10-1 S cm-1. Dynamic-mechanical analysis results suggest a certain degree of miscibility among the polymeric components of the blend. Copyright © 1996 Elsevier Science Ltd.372351655170Diaz, A.F., Kanazawa, K.K., (1979) J. Chem. Soc., Chem. Commun., p. 635Peres, R.C.D., Pernaut, J.M., De Paoli, M.-A., (1991) J. Polym. Sci.: Part A: Polym. Chem., 29, p. 225De Paoli, M.-A., Waltman, R.J., Diaz, A.F., Bargon, J., (1985) J. Polym. Sci. Polym. Chem. Ed., 23, p. 1687Bi, X., Pei, Q., (1987) Synth. Met., 22, p. 145Chen, Y., Qian, R., Li, G., Li, Y., (1991) Polym. Commun., 32, p. 189Zinger, B., Kijel, D., (1991) Synth. Met., 41-43, p. 1013Wang, H.L., Toppare, L., Fernandez, J.E., (1990) Macromolecules, 23, p. 1053Pron, A., Zagorska, M., Fabianovski, W., Raynor, J.B., Lefrant, S., (1987) Polym. Commun., 28, p. 193Ueno, T., Arntz, H.-D., Flesch, S., Bargon, J., (1988) J. Macromol. Sci.-chem., A25, p. 1557Kang, T.J., Miyata, S., Miyaki, T., (1993) Polym. Bull., 31, p. 593Nakata, M., Kise, H., (1993) Polym. J., 25, p. 91Olmedo, L., Hourquebie, P., Jousse, F., (1993) Adv. Mater., 5, p. 373Ferreira, C.A., Aeiyach, S., Delamar, M., Lacaze, P.C., (1990) J. Electroanal. Chem., 284, p. 351Niwa, O., Kakuchi, M., Tamamura, T., (1987) Macromolecules, 20, p. 749Quintas, M.C., Mano, V., Felisberti, M.I., De Paoli, M.-A., (1992) Proc. Simposio Iberoamericano de Polimeros, p. 141. , VigoMano, V., Felisberti, M.I., De Paoli, M.-A., Macromolecules, , submittedNiwa, O., Kakuchi, M., Tamamura, T., (1987) Polym. J., 19, p. 1293Mano, V., Felisberti, M.I., De Paoli, M.-A., (1993) Proc. 2° Congresso Brasileiro de Polimeros, p. 578. , São PauloAbrantes, L.M., Mesquita, J.C., Kalaji, M., Peter, L.M., (1991) J. Electroanal. Chem., 307, p. 275Diaz, A., (1981) Chem. Scripta, 17, p. 145Uosaki, K., Okazaki, K., Kita, H., (1990) J. Polym. Sci, Polym. Chem. Ed., 28, p. 399Diaz, A.F., Bargon, J., (1986) Handbook of Conducting Polymers, 1, p. 81. , Ed. T. A. Skothein, Marcel Dekker, New Yor
Dynamic Mechanical And Morphological Behavior Of Blends Of Polystyrene And Poly[acrylonitrile-g-(ethyleneco-propylene-co-diene)-g-styrene] Prepared By In Situ Polymerization Of Styrene
No full textPS/AES blends were prepared by in situ polymerization of styrene in the presence of AES elastomer, a grafting copolymer of poly(styrene-co- acrylonitrile) - SAN and poly(ethylene-co-propylene-co-diene)-EPDM chains. These blends are immiscible and present complex phase behavior. Selective extraction of the blends' components showed that some fraction of the material is crosslinked and a grafting of PS onto AES is possible. The morphology of the noninjected blends consists of spherical PS domains covered by a thin layer of AES. After injection molding, the blends show morphology of disperse elastomeric phase morphology in a rigid matrix. Two factors could contribute to the change of morphology: (1) the stationary polymerization conditions did not allow the mixture to reach the equilibrium morphology; (2) the grafting degree between PS and AES was not high enough to ensure the morphological stability against changes during processing in the melting state. The drastic change of EPDM morphology from continuous to disperse phase has as consequence a decrease in the intensity of the loss modulus peaks corresponding to the EPDM glass transition. However, the storage modulus at temperatures between the glass transition of EPDM and PS/SAN phases does not change significantly. This effect was attributed to the presence of the SAN rigid chains in the AES. © 2009 Wiley Periodicals, Inc. Journal of Applied Polymer Science 113: 2638-2648, 2009.113426382648Galloway, J.A., Jeon, H.K., Bell, J.R., Macosko, W., (2005) Polymer, 46, p. 183Ohishi, H., Ikehara, T., Nishi, T., (2001) J Appl Polym Sci, 80, p. 2347Katime, I., Quintana, J.R., Price, C., (1995) Mater Lett, 22, p. 297Ramsteiner, F., Heckmann, W., MacKee, G.E., Breulmann, M., (2002) Polymer, 42, p. 5995Socrate, S., Boyce, M.C., Lazzeri, A., (2001) Mech Mater, 33, p. 155Bucknall, C.B., (1989) Comprehensive Polymer Science, 10, pp. 27-47. , Allen, G, Bevington, J. C, Eastmond, G. C, Ledwith, A, Russo, S, Sigwalt, P, Eds, Pergamon Press: OxfordWu, J., Guo, B., Chan, C.-H., Li, J., Tang, H.-S., (2001) Polymer, 42, p. 8857Dompas, D., Groeninckx, G., (1994) Polymer, 35, p. 4743Choi, J.H., Ahn, K.H., Kim, S.Y., (2000) Polymer, 41, p. 5229Amado, F.D.R., Gondran, E., Ferreira, J.Z., Rodrigues, M.A.S., Ferreira, C.A., (2004) J Membr Sci, 234, p. 139Alfarraj, A., Nauman, E.B., (2004) Polymer, 45, p. 8435Matisová-Rychlá, L., Ryhlý, J., George, G.A., (2002) Polym Degrad Stab, 75, p. 385Saron, C., Felisberti, M.I., (2004) Mater Sci Eng A, 370, p. 293Larocca, N.M., Hage Jr, E., Pessan, L.A., (2004) Polymer, 45, p. 5265Tanabe, T., Furukawa, H., Okada, M., (2003) Polymer, 44, p. 4765Hwang, I.J., Lee, M.H., Kim, B.K., (1998) Eur Polym J, 34, p. 671Turchet, R.. Blendas de PMMA e AES: Morfologia e Propriedades Mecânicas, Master's Thesis, Instituto de Química, Universidade Estadual de Campinas, 2002Lourenço, E., Felisberti, M.I., (2007) J Appl Polym Sci, 105, p. 986Turchette, R.Felisberti, M. I. Polímeros:Ciência e Tecnologia 2006, 16, 158Ko, J., Park, Y., Choe, S., (1981) J Polym Sci: Polym Phys 1998, p. 36Sheng, J., Li, F.-K., Hu, J., (1998) J Appl Polym Sci, 67, p. 1199Keinath, S.E., Boyer, R.F., (1981) J Appl Polym Sci, 26, p. 2077Carvalho, F.P., Quental, A.C., Felisberti, M.I., (2008) J Appl Polym Sci, 110, p. 880Turchet, R., Felisberti, M.I., J Appl Polym Sci, , submittedLourenço, E., Felisberti, M.I., (2006) Eur Polym J, 42, p. 2632Szabó, P., Epacher, E., Földes, E., Pukánsky, E., (2004) Mater Sci Eng A, 383, p. 307Bucknal, C.B., (2001) J Microscopy, 201, p. 221Booij, H.C., (1977) Br Polym J, 9, p. 47Mäder, D., Bruch, M., Maier, R., Stricker, F., Mü lthaupt, R., (1999) Macromolecules, 32, p. 1252Lourenço, E., (2007) Caracterização de Poliestireno de Alto Impacto à base de elastômeros saturados de EPDM, , PhD Thesis, Instituto de Química, Universidade Estadual de Campinas, Campinas, BrazilPaul, D.R., Bucknall, C.B., (1999) Polymer Blends, , John Wiley and Sons, Inc, New YorkPiorkowska, E., Argon, A.S., Cohen, R.E., Schneider, M., Pith, T., Lambla, M., (1993) Polymer, 34, p. 4435Schneider, M., Pith, T., Lambla, M., (1997) J mater Sci, 32, p. 5191Cassu, S.N., Felisberti, M.I., (2002) J Appl Polym Sci, 83, p. 830Cassu, S.N., Felisberti, M.I., (2004) J Appl Polym Sci, 93, p. 229
Dynamic Mechanical Behavior And Relaxations In Polymers And Polymeric Blends [comportamento Dinâmico-mecânico E Relaxações Em Polímeros E Blendas Poliméricas]
No full textDynamic mechanical analysis (DMA) is widely used in materials characterization. In this work, we briefly introduce the main concepts related to this technique such as, linear and non-linear viscoelasticity, relaxation time, response of material when it is submitted to a sinusoidal or other periodic stress. Moreover, the main applications of this technique in polymers and polymer blends are also presented. The discussion includes: phase behavior, crystallization; spectrum of relaxation as a function of frequency or temperature; correlation between the material damping and its acoustic and mechanical properties.282255263Wunderlich, B., (1997) Thermal Characterization of Polymer Materials, 1, p. 305. , Turi, E. A., ed.2nd.ed., Academic Press Inc.: New YorkWetton, R.E., (1986) Developments in Polymer Characterization, p. 179. , Dawkins, J. V., ed.Elsevier Applied Sci. Publishers: LondonMcCrum, N.G., Buckley, C.P., Bucknall, C.B., (1997) Principles of Polymer Engineering, 2nd Ed., , Oxford University Press Inc.: New York, cap.Brown, M.E., (1988) Introduction to Thermal Analysis, 1st Ed., , Chapman and Hall Ltd.: New York, cap.8Nielsen, L.W., (1974) Mechanical Properties of Polymers and Composites, 1-2. , Marcel Dekker, INC.: New YorkMurayama, T., (1988) Encyclopedia of Polymer Science and Engineering, 5, p. 299. , Mark, H. F.Bikales, N. M.Overberger, C. G.Menges, G.Kroschwits, J. I., eds.2nd ed., John Wiley &Sons: New YorkMenard, P.K., (1999) Dynamic Mechanical Analysis: A Practical Introduction, , CRC Press LLC: New YorkFerry, J.D., (1980) Viscoelastic Properties of Polymers, , John Wiley & Sons: New YorkWard, I.M., (1983) Mechanical Properties of Solid Polymers, 2nd Ed., , John Wiley & Sons: New YorkHutchinson, J.M., (1997) The Physics of Glassy Polymers, p. 85. , Haward, R. N.Young, R. J., Eds.2nd Ed.Chapman and Hall: LondonGradin, P., Howgate, P.G., Seldén, R., Brown, R., (1989) Comprehensive Polymer Science, 2, p. 533. , Allen, G.Bevington, J. C.Booth, C.Price, C., eds.1st ed.Pergamon Press: New YorkMark, J.E., Eisenberg, A., Graessley, W.W., Mandelkern, L., Samulski, E.T., Koenig, J.L., Wignall, G.D., (1993) Physical Properties of Polymers, 2nd Ed., , American Chemical Society: WashingtonOlabisi, O., Robeson, L.M., Shaw, M.T., (1979) Polymer-Polymer Miscibility, , Academic Press: New YorkHeijboer, J., (1977) Int. J. Polym. Mater., 6, p. 11Jho, J.Y., Yee, A.F., (1991) Macromolecules, 24, p. 1905Yee, A.F., Smith, S.A., (1981) Macromolecules, 14, p. 54Schaefer, J., Steijskal, E.O., Perchak, D., Skolnick, J., Yaris, R., (1985) Macromolecules, 18, p. 368Yee, A.F., (1977) Polym. Eng. Sci., 17, p. 213Floudas, G., Higgins, J.S., Meier, G., Kremer, F., Fischer, E.M., (1993) Macromolecules, 26, p. 1676Jones, A.A., (1985) Macromolecules, 18, p. 902Hoff, E.A.W., Robinson, D.W., Willbourn, A.H., (1955) J. Polym. Sci., 18, p. 161Williams, G., (1966) Trans-Faraday Soc., 62, p. 2091Dionisio, M.S., Moura-Ramos, J.J., Williams, G., (1994) Polymer, 35, p. 1705Diaz-Calleja, R., Devine, I., Gargallo, L., Radic, D., (1994) Polymer, 35, p. 151Utracki, L.A., (1990) Polymer Alloys and Blends: Thermodynamics and Rheology, p. 1. , Hanser Publishers: New YorkPaul, D.R., Bucknall, C.B., (1999) Polymer Blends, , John Wiley & Sons: New YorkCassu, S.N., Felisberti, M.I., (1999) Polymer, 40, p. 4845Santos, L.E.P., (1995), Dissertação de Mestrado, Universidade Estadual de Campinas, BrasilKempler, D., Sperling, L.H., Utracki, L.A., Interpenetrating Polymer Networks (1994) Advances in Chemistry Series, p. 234. , Washington, DCFelisberti, M.I., (1990), Ph. Thesis, Albert-Ludwig-Universität, AlemanhaFelisberti, M.I., Müller, G., Stadler, R., Polym. Mater Sci. Eng (1990) Proc. of ACS Div. PMSE, 62, p. 659Rocha, S.M., (1998), Tese de Doutorado, Universidade Estadual de Campinas, BrasilSanchez, E.M.S., Zavaglia, C.A.C., Felisberti, M.I., (2000) Polymer, 41, p. 765Di Lorenzo, M.L., Frigione, M., (1997) J. Polym. Eng., 17, p. 429Koninig, C., Van Duin, M., Pagnoulle, C., Jerome, R., (1998) Prog. Polym. Sci., 23, p. 707Costa, S.C.G., Felisberti, M.I., (1999) J. Appl. Polym. Sci., 72, p. 1835Carone Jr., E., Felisberti, M.I., Nunes, S.P., (1998) J. Mater. Sci., 33, p. 3729Lipatov, Y.S., (1994) Interpenetrating Polymer Network, , Klempson, D.Sperling, L. H.Utracki, L. A., eds.ACS: Washington, DCChang, M.C.O., Thomas, D.A., Sperling, L.H., (1988) J. Polym. Sci., Part B: Polym. Phys., 26, p. 1627Hourston, D.J., Schäfer, F.-U., (1996) High Perform. Polym., 8, p. 19Boyer, R.F., (1968) Polym. Eng. Sci., 8, p. 161Heijboer, J., (1968) J. Polym. Sci., Part C: Polym. Sym., 16, p. 3755Keskkula, H., Turley, S.G., Boyer, R.F., (1971) J. Appl. Polym. Sci., 15, p. 351Karger-Kocsis, J., Kuleznev, V.N., (1982) Polymer, 23, p. 69
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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