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Orientation in amorphous polymers I. Preparation and testing of oriented samples
Author(s) -
Vrentas J. S.,
Vrentas C. M.,
Bhombal A. H.,
Lahalih M. S.
Publication year - 1984
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760241204
Subject(s) - materials science , birefringence , ultimate tensile strength , polystyrene , amorphous solid , polymer , composite material , rheology , relaxation (psychology) , creep , orientation (vector space) , crystallography , optics , geometry , psychology , social psychology , chemistry , physics , mathematics
Orientation effects in amorphous polystyrene are studied using a uniaxial stretching experiment. The rheological properties of the polymer are determined from an analysis of creep data obtained from the tensile apparatus, and oriented polymer samples are prepared at different extension ratios and rates of stretching. From birefringence and tensile strength measurements on oriented samples of polystyrene, it is shown that the tensile strength is not a unique function of the birefringence. It is proposed that the tensile strength may depend not only on the average orientation, as reflected by the birefringence, but on which portion of the relaxation spectrum is preferentially oriented.