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Effects of the addition of a liquid crystalline copolyester to polystyrenes on blending torque and mechanical properties of blends
Author(s) -
Ogata N.,
Tanaka T.,
Ogihara T.,
Yoshida K.,
Kondou Y.,
Hayashi K.,
Yoshida N.
Publication year - 1993
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1993.070480302
Subject(s) - copolyester , materials science , thermotropic crystal , viscosity , polymer blend , polymer , composite material , torque , rheology , phase (matter) , plastics extrusion , liquid crystalline , copolymer , polyester , organic chemistry , thermodynamics , chemistry , physics
Blending of polystyrenes (PS) with a thermotropic liquid crystalline polymer (LCP) was performed by using a continuous corotating twin screw extruder. The influence of LCP content on the blending process was studied by changing the barrel heater temperature and the screw speed. The torque of screw shafts, generated during the blending process, was influenced by LCP content and its influence was not simple. The torque generated during the blending process was not directly related to the apparent melt viscosity of blends. Further, the effects of the matrix viscosity on the morphology and mechanical properties of the PS/LCP blends were studied using three grades of PS as matrix resins. It was found that the size of the LCP dispersed phase decreased with increasing matrix viscosity. Consequently, the mechanical properties of the PS/LCP blend were improved. © 1993 John Wiley & Sons, Inc.