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Effects of thermal history on impact‐modified, high‐flow polycarbonate
Author(s) -
Chung James Y. J.
Publication year - 1995
Publication title -
journal of vinyl and additive technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 1083-5601
DOI - 10.1002/vnl.730010412
Subject(s) - polycarbonate , materials science , intermolecular force , intramolecular force , composite material , molding (decorative) , izod impact strength test , glass transition , yield (engineering) , thermal , melt flow index , polymer , thermodynamics , ultimate tensile strength , chemistry , organic chemistry , molecule , copolymer , physics
Miles Inc. recently developed an impact‐modified, high‐flow polycarbonate to help meet the material requirements for thin wall applications. Melt temperature and heat aging were found to affect its impact strength, yield stress, and dynamic mechanical relaxations. The results are explained in terms of the presence of polycarbonate's high‐energy intramolecular conformations formed as a result of intermolecular packing effects during molding, their rearrangement to trans‐tans conformations, and the increased interlocking between neighboring chains during heat aging.