AbstractCase II sorption kinetics have been analyzed for PS–n‐hexane systems. Samples of polystyrene characterized by several different annealing histories were used. For all thermal histories, then‐hexane sorption kinetics at several temperatures were measured, as well as some relevant mechanical properties of the glassy matrix, e.g., density and initial stress for crazing. The main influence of the thermal history is to appreciably alter the initial stress for crazing σc, as well as the swelling kinetics. The σccurve vs. annealing time is seen to go through a minimum which is paralleled, at 40°C, by a maximum in the swelling kinetics. The independent mechanical and sorption data obtained were compared with a recently proposed G. C. Sarti,Polymer,20, 827 (1979); G. C. Sarti and A. Apicella,Polymer,21, 1031 (1980) theory for Case II kinetics, which is shown to be particularly suitable to describe the observed
展开▼
