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Shear yield and crazing stresses in selected glassy polymers
Author(s) -
Ikeda Richard M.
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.1993.070470406
Subject(s) - crazing , materials science , polycarbonate , polymer , composite material , polyetherimide , amorphous solid , polysulfone , yield (engineering) , shear (geology) , polymer chemistry , chemistry , crystallography
The plane strain shear yield stress and the triaxial crazing stress were determined for several commercial glassy polymers as a function of temperature. The polymers considered were: polycarbonate (Lexan ® ), polysulfone (Udel ® ), polyetherimide (Ultem ® ), polyarylate (Arylon ® ), and an amorphous nylon (Zytel ® 330). When normalized to T g the data for the various polymers were similar but not identical. An exception may be the triaxial crazing strains. In the temperature region between [ T–T g ] = −300° and −50°C the crazing strains were all small (<1.5%), showed little temperature dependence, and appeared identical within the precision of our measurements. For temperatures below T g and above any major secondary relaxation, Poisson's ratio was found to be constant for all of the polymers examined, 0.42 (±5%). © 1993 John Wiley & Sons, Inc.