1,721,039 research outputs found
Simplified Analysis of Wined Film Polycondensation Reactor Used as Finisher in PET Synthesis
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Optical and Rheological Studies of Rigid Macromolecules with Dipoles in Hydridynamic and Electric Fields
No full textMorphology evolution in PS/LDPE blends in a twin screw extruder: Effects of compatibilizer
No full textIn order to understand the mixing in polymer extrusion, the morphology of PS/LDPE blends compatibilized with SEES was simulated based on the Lee and Park model. Experiments were performed in a co-rotating twin screw extruder and a Haake mixer, and the morphology of the compatibilized blends of various compositions was compared with the non-compatibilized ones. The size of the dispersed phase of the compatibilized blend was smaller than the noncompatibilized one, and the blend of the PE matrix had a smaller size in the dispersed phase than the non-compatibilized one. Simulation results were agreed well with experiments, and the Lee and Park model could be applied in the extrusion analysis of compatibilized polymer blends
Nonisothermal crystallization behavior of SPS/APS blends
No full textThe nonisothermal crystallization behavior of syndiotactic polystyrene (SPS)/ atactic polystyrene (APS) blends was studied with differential scanning calorimetry to investigate the effects of APS on the crystallization behavior of SPS. Polarized optical microscopy and wide-angle X-ray diffractometry were also used to observe the morphology of the SPS crystalline structure. From a cyclic heating/cooling temperature program, we obtained found that APS retarded the crystallization (and recrystallization) of SPS and made the crystal less perfect, but the ultimate crystallinity of SPS did not change with the addition of APS. We also observed that APS was disposed in the interfibrillar region of SPS spherulites and did not change the crystalline form of SPS. This result will be helpful for improving SPS applications through blending with rubber-toughened APS. (C) 2000 John Wiley & Sons, Inc
Experimental electrohydrodynamics of poly(gamma-benzyl-L-glutamate) in m-cresol solution subjected to shear flow and electric fields
No full textElectrohydrodynamics of a dilute solution of rigid macromolecules was experimentally studied in a continuation of previous theoretical work. We used poly(gamma-benzyl-L-glutamate), having 4 different molecular weights ranging from 15,000 to 236,000, dissolved in m-cresol. Poly(gamma-benzyl-L-glutamate) solutions were subjected to combinations of simple shear flow field and uniform electric field perpendicular to the shear direction. Transient birefringence and extinction angle were simultaneously measured using the phase-modulated birefringence method Steady state re suits were compared with the theoretical prediction from previous works and rotational diffusivity and permanent dipole strength of PBLG were obtained from multiple parameter fitting. Consequently, the optical state of PBLG solution could be explained to a certain extent by the dimensionless field parameters established in the previous theory
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