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Diffusion and some structural effects of two chlorinated hydrocarbon solvents in bisphenol A polycarbonate
Author(s) -
Titow W. V.,
Braden M.,
Currell B. R.,
Loneragan R. J.
Publication year - 1974
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.1974.070180321
Subject(s) - sorption , polycarbonate , solvent , polymer , bisphenol a , diffusion , polymer chemistry , solvent effects , chemistry , hydrocarbon , bisphenol , chemical engineering , materials science , organic chemistry , thermodynamics , adsorption , epoxy , physics , engineering
CH 2 ClCH 2 Cl and CHCl 3 , in which bisphenol A polycarbonate is normally readily soluble, were sorbed into the polymer from the liquid phase at 24–25°C. Sorption behavior was studied over a range of solvent activities (ambient concentrations), and the effects of repeated sorptions were observed. Penetration was strongly dependent on solvent concentration and on the previous history of the polymer. Time dependence was also observed, evidently associated with the rate of relaxation processes in the polymer surface since the effects increased logarithmically with solvent activity. Analysis of sorption curves, supplemented by DSC and density determinations, showed that the sorbed solvents caused a structural rearrangement (ordering) of the polymer when present above the critical content of 0.3 w/w. The rearrangement was not identical with that caused by heating the polymer, as evidenced by differences in subsequent solvent sorption behavior.