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The transport of methyl methacrylate monomer in poly(methyl methacrylate)
Author(s) -
Hopfenberg H. B.,
Stannett V. T.,
Jacques C. H. M.
Publication year - 1975
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.1975.070190911
Subject(s) - kinetics , sorption , penetrant (biochemical) , methyl methacrylate , monomer , polymer chemistry , materials science , methacrylate , polymer , fick's laws of diffusion , sorbent , chemistry , diffusion , organic chemistry , thermodynamics , composite material , adsorption , physics , quantum mechanics
The absorption kinetics and equlibria of methyl methacrylate monomer into poly(methyl methacrylate) were studied over a range of penetrant activities. The interval sorption kinetics at elevated activities were determined, compared, and contrasted with the integral sorption experiments in previously unpenetrated film samples. The sorption kinetics in previously unpenetrated films were predominantly case II or relaxation controlled at high activities. A Fickian contribution to the overall kinetics was apparent at lower activities. In contrast, interval sorption, at elevated activities in previously equilibrated and plasticized samples, followed Fickian kinetics rather closely, whereas resorption, over an activity range which involved a traversal of the effective T g , was characterized by more complicated kinetics involving a super case II mechanism at long times. These composite results reinforce the notion that the kinetics describing penetration of a single penetrant into a single polymer are extremely sensitive to the boundary condition imposed upon the polymeric sorbent.