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Molding of syndiotactic polystyrene under its melting temperature
Author(s) -
Abbondanza Luigi,
Garbassi Fabio,
Gennaro Antonio,
Giannotta Giorgio,
Marra Gianluigi,
Po' Riccardo,
Toscani Francesco
Publication year - 2001
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 - 10.1002/1097-4628(20010418)80:3<377::aid-app1109>3.0.co;2-o
Subject(s) - tacticity , polystyrene , materials science , thermoplastic elastomer , compression molding , polymer , composite material , thermoplastic , molding (decorative) , atmospheric temperature range , polymer chemistry , thermodynamics , copolymer , polymerization , mold , physics
Syndiotactic polystyrene (SPS), a thermoplastic polymer that exhibits a high T m in some crystalline forms, can be conveniently processed by a cold‐compaction technique. Processing temperatures in the range of 150–210°C, well below the T m , gives rise to physicomechanical properties comparable and even better than those obtained by thermal compression or injection molding. The optimum treatment temperature seems to fall around 175°C. X‐ray diffraction analysis, thermal analysis, and density measurements suggest that such behavior is connected to phase transitions of SPS and favored by the presence of styrene included in the crystalline fraction. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 377–383, 2001