Diffusion and some structural effects of two chlorinated hydrocarbon solvents in bisphenol A polycarbonate

✍ Scribed by W. V. Titow; M. Braden; B. R. Currell; R. J. Loneragan

• Publisher: John Wiley and Sons
• Year: 1974
• Tongue: English
• Weight: 857 KB
• Volume: 18
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1974.070180321

✦ Synopsis

CHzClCHzCl and CHCla, in which bisphenol A polycarbonate is normally readily soluble, were sorbed into the polymer from the liquid phase a t 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.