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Strain effects in the mass flux of methanol in poly(methyl methacrylate)
Author(s) -
Ware Robert A.,
Cohen Claude
Publication year - 1980
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.1980.070250501
Subject(s) - penetrant (biochemical) , materials science , polymer , isothermal process , sorption , diffusion , poly(methyl methacrylate) , methyl methacrylate , polymer chemistry , thermodynamics , polystyrene , mass flux , molar mass , composite material , chemistry , organic chemistry , copolymer , physics , adsorption
Diffusion of organic solvents into glassy polymers often results in a phase transformation of the hard, solid polymer into a swollen, rubbery material. During the sorption, internal stresses exist in the swollen and glassy parts of the polymer and are thought to contribute significantly to the “anomalous” diffusion observed in many penetrant–polymer systems. In this investigation, isothermal sorption data for the methanol–poly(methyl methacrylate) system have been obtained on plates ranging in thickness from 1/32 to ¼ in. The results show features characteristic of both a strain‐dependent diffusion coefficient and of a stress gradient contribution to the mass flux. An attempt to reproduce these results by combining a strain‐dependent diffusion coefficient model with a stress‐induced contribution to the flux is presented.