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Dimensional changes during solvent‐induced crystallization of poly(ethylene terephthalate) films
Author(s) -
Durning Christopher J.,
Rebenfeld Ludwig
Publication year - 1984
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.1984.070291021
Subject(s) - poly ethylene , crystallization , materials science , amorphous solid , penetrant (biochemical) , softening , ethylene , diffusion , fick's laws of diffusion , sorption , composite material , polymer , solvent , polymer chemistry , polyethylene terephthalate , chemical engineering , thermodynamics , crystallography , chemistry , organic chemistry , adsorption , physics , engineering , catalysis
Abstract The sample dimensional changes accompanying diffusion with induced crystallization in amorphous poly(ethylene terephthalate) (PET) films are analyzed. Initially, the film's lateral area remains practically constant, but near the end of the process, it increases rapidly, consistent with non‐Fickian models for diffusion. The ultimate relative thickness increase is about double that for the lateral dimension, implying that plastic deformation in the thickness direction accompanies the sorption. Plots of fractional area increase (Δ A /Δ A ∞ ) vs. fractional weight gain ( W/W ∞ ) indicate severe softening of the polymer by the penetrant.