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Orientation development and relaxation in injection molding of amorphous polymers
Author(s) -
Dietz Wolfgang,
White James L.,
Clark Edward S.
Publication year - 1978
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.760180407
Subject(s) - birefringence , materials science , amorphous solid , polymer , molding (decorative) , orientation (vector space) , composite material , stress (linguistics) , relaxation (psychology) , stress relaxation , vitrification , thermodynamics , optics , crystallography , creep , geometry , physics , psychology , social psychology , linguistics , chemistry , mathematics , philosophy , nuclear physics
Orientation development in amorphous polymer melts being vitrified in an injection molding process is described. Predictions of orientation development are based on the argument that the stress‐optical laws are valid in the molten stare and birefringence values appropriate to the stress levels at the time of vitrification remain. This theory is compared to birefringence distributions determined in injection molded parts.