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Crystallization from the glassy state
Author(s) -
Collier John R.,
Baer Eric
Publication year - 1966
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.1966.070101003
Subject(s) - crystallization , materials science , isothermal process , diffusion , thermodynamics , glass transition , fick's laws of diffusion , crystallization of polymers , poly ethylene , polymer , constant (computer programming) , ethylene , polymer chemistry , composite material , chemistry , organic chemistry , physics , catalysis , computer science , programming language
Isothermal crystallization of poly[3,3‐bis(chloromethyl)oxacyclobutane] and poly‐(ethylene terephthalate) from the quenched glassy state gave small lamellae approximately 1000–2000 A. in lateral dimension with a constant thickness of about 100 A. The maximum primary nuclei density for crystallization slightly above the glass transition temperature, T g , was 10 10 greater than frequently observed during spherulitic growth from the melt. Since the lamellae grow at a linear rate, the crystallization process could be described by the Avrami theory for two‐dimensional growth with a constant nuclei density. By assuming that crystallization near T g is diffusion‐controlled, bulk crystallization rate data were analyzed to obtain self‐diffusion coefficients whose activation energies were similar to reported values for other polymers.