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Free volume and the annealing and antiplasticizing of bisphenol A polycarbonate
Author(s) -
Robertson Richard E.,
Joynson Catherine W.
Publication year - 1972
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.1972.070160317
Subject(s) - annealing (glass) , glass transition , polycarbonate , materials science , bisphenol a , composite material , volume (thermodynamics) , saturation (graph theory) , polymer , polymer chemistry , thermodynamics , mathematics , physics , epoxy , combinatorics
Annealing below the glass transition temperature and the addition of an antiplasticizer are each known to increase the yield stress and the density of glassy bisphenol A polycarbonate. We have studied the combined effects of annealing and antiplasticizing to see if the individual effects would interfere with one another, as might be expected if the same free volume were involved in each. We find that the effects, even when they individually approach saturation, remain additive. This suggests that the free volume in the glass has at least two parts, one of which is affected by annealing and the other by antiplasticization. The available data indicate that the rate at which the yield stress changes with measured volume is different for the two parts.