1,720,990 research outputs found
Luminescent Properties Of A Silicone-carbazolyl Polyfluorene Hybrid Material For Device Applications
No full textIn the present work, bilayered hybrids obtained by hydrosilylation of polysiloxane with carbazolyl moieties (Sil-Cz) and polyfluorene (Sil-PFO) had their photophysical behavior, morphological characteristics and interaction properties studied for applications in electroluminescent devices. Fluorescence spectra of the Sil-Cz did not show emission in the excimer/aggregate region (from 400 to 500 nm). This is an unexpected behavior since most of the carbazole-based materials present excimer and aggregation. Nonetheless, this unusual observation was also predicted by geometry optimization calculations. Fluorescence spectra were taken for both compounds separately and for the bilayered system show some evidence of interaction between carbazolyl and polyfluorene moieties, giving rise to the supposition that the can form a system with tunable luminescent properties. Copyright © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.2961170175Weyenberg, D.R., Lanes, T.H., (1990) Silicon Based Polymer Science: A Comprehencive Resource, , J. M. Zigler, F. W. G. Fearon, Eds., Adv. Chem. Ser 224, American Chemical Society, Washington DCChalk, A.J., Harrod, J.F., (1965) J. Am. Chem. Soc., 87, pp. 16-21Domingues, R.A., Yoshida, I.V.P., Atvars, T.D.Z., (2010) J. Polym. Sci. Polym. Phys. Ed., 48, pp. 74-81Belfield, D., Najjar, O., Plus, S.M., (1998) Polym. Prep, 39, pp. 445-446Miyate, S., Nalva, H.S., (1998) Organic Electroluminescet Materials and Devices, , Gordon and Breach, TokyoAkcelrud, L., (2003) Progr. Polym. Sci., 28, pp. 875-962MacHado, A.M., Neto, J.D.D., Cossiello, R.F., Atvars, T.D.Z., Ding, L., Karasz, F.E., Akcelrud, L., (2005) Polymer, 46, pp. 2452-2460Ego, C., Marsitzky, D., Becker, S., Zhang, J.Y., Grimsdale, A.C., Mullen, K., MacKenzie, J.D., Friend, R.H., (2003) J. Am. Chem. Soc., 125, pp. 437-443Leclerc, M., (2001) J. Polym. Sci. Polym. Chem., 39, pp. 2867-2873Chochos, C.L., Kallitsis, J.K., Gregoriou, V.G., (2005) J. Phys. Chem. B, 109, pp. 8755-8760Grisorio, R., Piliego, C., Striccoli, M., Cosma, P., Fini, P., Gigli, G., Mastrolliri, P., Nobile, C.F., (2008) J. Prhys. Chem. C, 112, pp. 20076-20087Lee, T.W., Park, J.J., Kwon, Y., Hayakawa, T., Choi, T.L., Park, J.H., Das, R.R., Kakimoto, M.A., (2008) Langmuir, 24, pp. 12704-12709Nowacki, B., Iamazaki, E.T., Cirpan, A., Karasz, F., Atvars, T.D.Z., Akcelrud, L., (2009) Polymer, 50, pp. 6057-6064Brewer, P.J., Demello, A.J., Demello, J.C., Lane, P.A., Bradley, D.D.C., Fletcher, R., O'Brien, J., (2006) J. Appl. Phys., 99, p. 114502Brewer, P.J., Lane, P.A., Huang, J., Demello, A.J., Bradley, D.D.C., Demello, J.C., (2005) Phys. Rev. B, 71, p. 205209Martins, T.D., Weiss, R.G., Atvars, T.D.Z., (2008) J. Braz. Chem. Soc., 19, pp. 1450-1461Souza, A.A., Cossiello, R.F., Plivelic, T.S., Mantovani, G.L., Faria, G.C., Atvars, T.D.Z., Torriani, I.L., Deazevedo, E.R., (2008) Eur. Polym. J., 44, pp. 4063-4073Bloise, A.C., Deazevedo, E.R., Cossiello, R.F., Bianchi, R.F., Balogh, D., Faria, R.M., Atvars, T.D.Z., Bonagamba, T.J., (2005) Phys. Rev. B, 71, p. 171202Faria, G.C., Plivelic, T.S., Cossiello, R.F., Souza, A.A., Atvars, T.D.Z., Torriani, I.L., De Azevedo, E.R., (2009) J. Phys. Chem. B., 113, pp. 11403-11413Clark, M., Cramer III, R.D., Van Opdenbosch, N., (1989) J. Comp. Chem., 10, p. 982. , Spartan 5.0: Program for Molecular Mechanics and Quantum Chemical CalculationsUniversity of California, USA, 1997Oliveira, H.P.M., Martins, T.D., Honõrio, K.M., Rodrigues, P.C., Akcelrud, L., Silva, A.B.F., Atvars, T.D.Z., (2009) J. Braz. Chem. Soc., 20, pp. 160-166MacHado, A.M., Munaro, M., Martins, T.D., Davila, L.Y.A., Giro, R., Caldas, M.J., Atvars, T.D.Z., Akcelrud, L.C., (2006) Macromolecules, 39, pp. 3398-3407Skilton, P.F., Ghiggino, K.P., (1984) Polym. Photochem., 5, pp. 179-19
Whitening Regenerated Cellulose Fibers Using Fluorescent Agent, Surfactants, And Salt-color Indices Measurements
No full textThe whitening efficiency of regenerated cellulose fibers using sodium 4,4′-distyrylbiphenyl sulfonate in the presence of an anionic surfactant (sodium dodecylsulfate) and a cationic surfactant (dodecyl trimethyl ammonium chloride) and salt (NaCl) was determined by fluorescence spectroscopy and color index values (brightness, whiteness, and yellowness). Epifluorescence images gave an intense blue color with an apparent uniform emission distribution. In absence of salt, the whitening efficiency was higher for aqueous solutions containing cationic surfactant below critical micellar concentration (cmc). In presence of salt, whitening efficiency was higher for anionic surfactant and more important. The concentration of surfactant required for greater brightness, whiteness, and yellowness was lower than that required in absence of salt. These data were discussed by the decrease of the cmc and by the screening of the modified cellulose fibers by counter ions coming from the salt. The role of surfactants was explained by the admicelization during the sorption process. © 2011 Wiley Periodicals, Inc.124543714380Blackburn, R.S., Harvey, A., Kettle, L.L., Manian, A.P., Payne, J.D., Russell, S.J., (2007) J Phys Chem B, 111, p. 8775Mischnick, P., Heinrich, J., Gohdes, M., Wilke, O., Rogmann, N., (1985) Macromol Chem Phys, 2000, p. 201Jakob, H.F., Fengel, D., Tschegg, S.E., Fratzl, P., (1995) Macromolecules, 28, p. 8782Ha, M.A., Apperley, D.C., Evans, B.W., Huxham, M., Jardine, W.G., Vietor, R.J., Reis, D., Jarvis, M.C., (1998) Plant J, 16, p. 183Muller, M., Hori, R., Itoh, T., Sugiyama, J., (2002) Biomacromolecules, 3, p. 182Abu-Rous, M., Ingolic, E., Schuster, K.C., (2006) Cellulose, 13, p. 411Kreze, T., Strnad, S., Stana-Kleinschek, K., Ribitsch, V., (2001) Mater Res Innov, 4, p. 107Krassig, H., (1978) Tappi, 61, p. 93Kotek, R., (2007) Handbook of Fiber Chemistry, p. 667. , In, 3rd ed. Lewin, M. Ed.CRC Press: New YorkStana-Kleinschek, K., Strnad, S., Ribitsch, V., (1999) Polym Eng Sci, 39, p. 1412Stana, K.K., Pohar, C., Ribitsch, V., (1995) Colloid Polym Sci, 273, p. 1174Timofei, S., Schmidt, W., Kurunczi, L., Simon, Z., (2000) Dyes Pigments, 47, p. 5Sarrazin, P., Beneventi, D., Chaussy, D., Vurth, L., Stephan, O., (2009) Colloids Surf A: Physicochem Eng Aspects, 334, p. 80Iamazaki, E.T., Atvars, T.D.Z., (2007) Langmuir, 23, p. 12886Leaver, I.H., Milligan, B., (1984) Dyes Pigments, 5, p. 109Canonica, S., Kramer, J.B., Reiss, D., Gygax, H., (1997) Environm Sci Tech, 31, p. 1754Choudhury, A.K.R., (2006) Textile Preparation and Dyeing, , Science Publishers: New YorkIamazaki, E.T., Atvars, T.D.Z., (2006) Langmuir, 22, p. 9866Lewis, D.M., (1998) J Soc Dyers Col, 114, p. 264Vigil, M.R., Bravo, J., Baselga, J., Yamaki, S.B., Atvars, T.D.Z., (2003) Curr Org Chem, 7, p. 197Schurr, O., Yamaki, S.B., Wang, C.H., Atvars, T.D.Z., Weiss, R.G., (2003) Macromolecules, 36, p. 3485Baldi, L.D.C., Iamazaki, E.T., Atvars, T.D.Z., (2008) Dyes Pigments, 76, p. 669Iamazaki, E.T., Pereira-Da-Silva, M.A., Carvalho, A.J.F., Romero, R.B., Gonôalves, M.C., Atvars, T.D.Z., (2010) J Appl Polym Sci, p. 118. , electronic version available since junePinto, R., Amaral, A.L., Ferreira, E.C., Mota, M., Vilanova, M., Ruel, K., Gama, M., (2008) BMC Biotechnol, 8, p. 7Berns, R.S., Reiman, D.M., (2002) Col Res Appl, 27, p. 360Billmeyer Jr., F.W., Saltzman, M., (1981) Principles of Color Technology, , 2nd ed. Wiley-Interscience: New YorkSenthilkumar, A., (2007) Dyes Pig, 75, p. 356Imura, K., (2007) Color Res Appl, 32, p. 195Imura, K., (2007) Color Res Appl, 32, p. 449Smit, K.J., Ghiggino, K.P., (1991) J Polym Sci Part B-Polym Phys, 29, p. 1397Aloulou, F., Boufi, S., Belgacem, N., Gandini, A., (2004) Colloid Polym Sci, 283, p. 344Alila, S., Boufi, S., Belgacem, M.N., Beneventi, D., (2005) Langmuir, 21, p. 8106O'Haver, J.H., Harwell, J.H., (1995) Surfactant Adsorption and Surface Solubilization, p. 49. , Sharma, R. Ed.ACS Symposium Series 615, American Chemical Society: Washingto
Photophysical Study In Blends Of Poly(alkyl Methacrylate-co-styrene)/ Polystyrene
No full textThe morphology of blends of poly(alkyl methacrylate-co-styrene)/polystyrene [XMAS/PS; X = M (methyl), E (ethyl)] was studied at the microscopic level (micrometric scale) by differential scanning calorimetry (DSC), dynamic-mechanical analysis (DMA), and epifluorescence microscopy (EFM) and at the nanoscopic scale by steady-state and time-resolved fluorescence emission spectroscopy (FES). Timeresolved energy transfer analysis was used to probe the interpenetration of molecular chains. The copolymers MMAS and EMAS (approximate content in mol %: 78% of methacrylate units; 22% of styrene units) covalently labeled with 9-vinylanthracene units (≤0.1%), as fluorescent comonomer (fluorophore), were synthesized by emulsion polymerization and were characterized by FTIR, 1H NMR, 13C NMR, TGA, GPC, DSC, DMA, UV-vis, and FES. Films of copolymer blends were prepared by casting from dilute chloroform solutions with compositions of 5, 20, 50, 80, and 95 wt % of copolymer. Some miscibility was observed for the blends of XMAS/PS containing 5, 20, and 95 wt % of copolymer. Interaction strength in blends increased with the size of aliphatic chain of the ester group in the copolymer. Blends with 50 wt % of copolymer are always immiscible. Two values of glass transition temperatures were observed by DSC and DMTA. MMAS/PS and EMAS/PS blends of copolymer-richer compositions (95 and 80 wt %) show fluorescence lifetimes with broader distributions, suggesting a wider distance distribution of interlumophoric groups.372490969108Takeaki, A., Hajime, T., (2001) Macromolecules, 34, p. 1953Utracki, L.A., (1989) Polymer Alloys and Blends: Thermodynamics and Rheology, , Hanser: Munich, Chapter 2Benabdelghani, Z., Belkhiri, R., Djadoun, S., (1995) Polym. Bull. (Berlin), 35, p. 329Robertson, C.G., Wilkes, G.L., (2000) Polymer, 41, p. 9191Ziaee, S., Paul, D.R., (1996) J. Polym. Sci., Part B: Polym. Phys., 34, p. 2641Li, G.X., Cowie, J.M.G., Arrighi, V., (1999) J. Appl. 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Probing Interchain Interactions In Emissive Blends Of Poly[2-methoxy-5- (2′-ethylhexyloxy)-p-phenylenevinylene] With Polystyrene And Poly(styrene-co-2-ethylhexyl Acrylate) By Fluorescence Spectroscopy
Full text linkWe present dynamic and static photoluminescence studies on polymer blends of conjugated poly[2-methoxy-5-(2′-ethylhexyloxy)-p-phenylenevinylene] (MEH-PPV) with polystyrene-co-1-pyrenyl methyl methacrylate and its copolymer poly(styrene-co-2-ethylhexyl acrylate-co-1-pyrenylmethyl methacrylate) (with 9 mol% and 19 mol% of 2-ethylhexyl acrylate units and 0.06 mol% of 1-pyrenyl). Pyrenyl-labeled polystyrene and its copolymers were synthesized by emulsion polymerization and characterized by 13C and 1H-NMR, FTIR, GPC, DSC, and UV-Vis. Spin-coating films of the blends were prepared from chloroform solutions with 0.1, 0.5, 1.0, and 5.0 wt% of MEH-PPV. The miscibility of these systems was studied by non-radiative energy transfer processes between the 1-pyrenyl moieties (the energy donor) and MEH-PPV (the energy acceptor). 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Detection Of Residual Acidic Groups In Several Poly(n-alkyl Methacrylate)s Using Photopnysical And Photochemical Probes
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Phosphorescence Lifetime In Polymer Relaxation Studies: Phase Resolution Method [aquisição De Tempos De Vida De Fosforescência Com Resolução De Fase E Sua Aplicação Ao Estudo De Relaxações Em Polímeros]
No full textWe describe in this work a simple experimental set up to perform time dependent luminescence experiments in time scales from mili-seconds to seconds, based on the phase resolution of the emission signal. This system is composed by modulation of a continuous light source with an external chopper controlled by a lock-in amplifier. We exemplified the utility of the system in studies of phosphorecence emission using benzophenone dissolved in polystyrene and since the phosphorescence intensity and lifetime are temperature-dependent processes, we also studied polymer relaxation processes in the temperature range from 20 to 400K. A software that drives the spectrofluorimeter and controls both the cryosystem and the lock-in amplifier was developed.213332336Birks, J.B., (1970) Photophysics of Aromatic Molecules, , Willey-Interscience, LondonSakurovs, R., Ghiggino, K.P., (1981) Aust. J. Chem., 34, p. 1367Rabek, J.F., (1982) Experimental Methods in Photochemistry and Photophysics, , John Willey & Sons, AvonO'Connor, D., Phillips, D., (1984) Time-Correlated Single Photon Counting, , Academic Press, LondonBailey, E.A., Rollefson, G.K., (1954) J. Chem. Phys., 21, p. 1315McGown, L.B., Bright, F.V., (1984) Anal. Chem., 56, pp. 1400A(1989) Manual de Operação do Amplificador Lock-in SR530, , Stanford Research SystemsTalhavini, M., Atvars, T.D.Z., (1995) Quím. Nova, 18, p. 298Sabadini, E., (1988), Tese de MestradoUNICAMPTalhavini, M., (1995), Dissertação de MestradoUNICAMPGuillet, J.E., (1988) Advances in Photochemistry, 14, p. 91. , Volman, D. H.Hammond, G. S. and Gollnick, K. (editores:), Wiley, New YorkHalary, J.L., Monnerie, L., (1986) Photophysical and Photochemical Tools in Polymer Science, 182, p. 589. , NATO ASI Series, Winnik, M. (editor), D. Riedel, New YorkRusakonics, R., Byer, G.W., Leermakers, P.A., (1971) J. Am. Chem. Soc., 93, p. 3263Hikosaka, Y., Hikida, T., (1996) Chem. Phys., 203, p. 137Zevenhuijzen, D., Van Der Werf, R., (1977) Chem. Phys., 26, p. 27
A Morphological View Of The Sodium 4,4′-distyrylbiphenyl Sulfonate Fluorescent Brightness Distribution On Regenerated Cellulose Fibers
No full textEvidence of the sorption of the whitening agent sodium 4,4′- distyrylbiphenyl sulfonate in the presence of the anionic surfactant sodium dodecylsulfate or the cationic surfactant dodecyl trimethyl ammonium chloride on regenerated cellulose fibers is given by several microscopy techniques. Scanning electron microscopy provided images of the cylindrical fibers with dimensions of 3.5 cm (length) and 13.3 lm (thickness), with empty cores of 1 μm diameter and a smooth surface. Atomic force microscopy showed a fiber surface with disoriented nanometric domains using both tapping-mode height and phase image modes. Atomic force microscopy also showed that the whitening agent and surfactant molecules were sorbed onto the fiber surface, in agreement with the adsolubilization sorption model. Transmission electron microscopy showed fibers with nanometric parallel cylinders, surrounded by holes where the fluorescent whitening molecules accumulated. On the basis of these techniques, we conclude that the sorption process occurs preferentially on the fiber surface in contact with the water solution, and under saturated conditions, the whitening agent penetrates into the pores and are simultaneously sorbed on the pore walls bulk, forming molecular aggregates. © 2010 Wiley Periodicals, Inc.118423212327Pielesz, A., Wesełucha-Birczyńska, A., Freeman, H.S., Wlochowicz, A., (2005) Cellulose, 12, p. 497Kreze, T., Strand, S., Stana-Kleinschek, K., Ribitsch, V., (2001) Mater. Res. Innov., 4, p. 107Abu-Rous, M., Ingolic, E., Schuster, K.C., (2006) Cellulose, 13, p. 411Jakob, H.F., Fengel, D., Tschegg, S.E., Fratzl, P., (1995) Macromolecules, 28, p. 8782Há, M.A., Apperley, D.C., Evans, B.W., Huxham, M., Jardine, W.G., Vietor, R.J., Reis, D., Jarvis, M.C., (1998) Plant. J., 16, p. 183Muller, M., Hori, R., Itoh, T., Sugiyama, J., (2002) Biomacromolecules, 3, p. 182Nigmatullin, R., Lovitt, R., Wright, C., Linder, M., Nakari-Setala, T., Gama, A., (2004) Colloids Surf B. Biointerfaces, 35, p. 125Zugenmaier, P., (2001) Prog. Polym. Sci., 26, p. 1341Krassig, H., (1978) Tappi, 61, p. 93Kotek, R., (2007) Handbook of Fiber Chemistry, p. 667. , 3rd ed.Lewin, M., Ed.CRC Press: New YorkMikhailov, N.V., Gorbacheva, V.O., Krasova, I.I., Milkova, L.P., Bochkina, V.S., Nikolaeva, N.S., (1972) Fiber Chem., 2, p. 619Iamazaki, E.T., Atvars, T.D.Z., (2007) Langmuir, 23, p. 12886Iamazaki, E.T., Atvars, T.D.Z., (2006) Langmuir, 22, p. 9866Stana-Kleinschek, K., Strand, S., Ribitsch, V., (1999) Polym. Eng. Sci., 39, p. 1412Stana-Kleinschek, K., Pohar, C., Ribitsch, V., (1995) Colloid Polym. Sci., 273, p. 1174Yamaki, S.B., Barros, D.S., Garcia, C.M., Socoloski, P., Oliveira, O.N., Atvars, T.D.Z., (2005) Langmuir, 21, p. 5414Kim, J., Yun, S., Ounaies, Z., (2006) Macromolecules, 39, p. 4202Iamazaki, E.T., Atvars, T.D.Z., (2008) Dyes Pigm, 76, p. 669Aloulou, F., Boufi, S., Belgacem, N., Gandini, A., (2004) Colloid Polym. Sci., 283, p. 344Alila, S., Boufi, S., Belgacem, M.N., Beneventi, D., (2005) Langmuir, 21, p. 8106O'Haver, J.H., Harwell, J.H., In surfactant adsorption and surface solubilization (1995) ACS Symposium Series, 615, p. 49. , Sharma, R., Ed.American Chemical Society: WashingtonTalhavini, M., Atvars, T.D.Z., Schurr, O., Weiss, R.G., (1998) Polymer., 39, p. 322
Structural Study Of Polymer Blends By Fluorescence Spectroscopy
No full textSteady-state fluorescence spectra and time correlated single-photon counting measurements were performed on samples of poly(vinyl alcohol), poly(vinyl acetate) and their blends in different proportions (9/1, 1/1 and 1/9) containing fluorescein and/or anthracene probes. The interface thickness, the surface to volume ratio of microdomains and the heterogeneity of the samples were determined from those measurements.72-74467469Morawetz, H., Piérola, I.F., Jachowicz, J., Chen, H.L., (1982) Polym. Prep., 23, p. 12Dibbern-Brunelli, D., Atvars, T.D.Z., (1995) J. Appl. Polym. Sci., 55, p. 88
Photoinduced Birefringence In Di-azo Compounds In Polystyrene And Poly(methyl Methacrylate) Guest-host Systems
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Polymeric Light Emitting Devices [dispositivos Polimŕricos Eletroluminescentes]
No full textHere we present an overview of electroluminescent devices that use conjugated polymers as the active media. The principal components of the devices are described and we show some examples of conjugated polymers and copolymers usually employed in polymeric light emitting devices (PLED), Some aspects of the photo and electroluminescence properties as well as of the energy transfer processes are discussed. As an example, we present some of the photophysical properties of poly(fluorene)s, a class of conjugated polymers with blue emission.292277286Shirakawa, H., Louis, E.J., MacDiarmid, A.G., Chiang, C.K., Heeger, A.J., (1977) J. Chem. Soc. Chem. Commun., 16, p. 578Chiang, C.K., Ficher, C.R., Park, Y.W., Heeger, A.J., Shirakawa, H., Louis, E.J., Gau, S.C., MacDiarmid, A.G., (1977) Phys. Rev. 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