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Ultradrawing of amorphous polymers by coextrusion illustrated with atactic polystyrene
Author(s) -
Zachariades Anagnostis E.,
Sherman Edward S.,
Porter Roger S.
Publication year - 1979
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.1979.070241006
Subject(s) - materials science , polystyrene , extrusion , ultimate tensile strength , composite material , amorphous solid , birefringence , polymer , modulus , polymer chemistry , crystallography , optics , chemistry , physics
Films of pure and high‐impact atactic polystyrene were prepared by the recently developed technique of solid‐state coextrusion. The films were produced at extrusion rates ≥4 cm/min at 126°C with a maximum extrusion draw ratio (EDR) of 11.6. These ultradrawn films are fibrous, have a high birefringence of −2.24 × 10 −2 , and exhibit a 72% elastic recovery. The material has a tensile modulus of ∼4–5 GPa and a tensile strength to break of 85 MPa. Thermal analysis suggests a constant T g .