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Physical aging and crystallization of amorphous poly(aryl ether ether ketone ketone)
Author(s) -
Tan Susheng,
Luo Jun,
Su Aihua,
Zhao Xiaoguang,
Zhou Enle
Publication year - 1998
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/(sici)1097-4628(19981031)70:5<907::aid-app10>3.0.co;2-q
Subject(s) - activation energy , crystallization , ketone , glass transition , arrhenius equation , ether , amorphous solid , materials science , peek , thermodynamics , quenching (fluorescence) , isothermal process , polymer chemistry , chemistry , organic chemistry , polymer , composite material , physics , quantum mechanics , fluorescence
Physical aging of poly(aryl ether ether ketone ketone) (PEEKK) was investigated. Heat flow responses were measured after annealing the amorphous samples that were obtained by quenching the melt into an ice‐water bath at just below the glass transition temperature. Isothermal cold crystallization of the aged samples was carried out. The Avrami equation was used to determine the kinetic parameters, and the Avrami constant n is about 2. An Arrhenius form was used to evaluate the relaxation activation energy of physical aging and the transport activation energy of isothermal crystallization. The activation energy of physical aging was similar in magnitude to that observed for the temperature dependence of crystallization under conditions of transportation control. Results obtained were interpreted as purely kinetic effects associated with the glass formation process. © 1998 John Wiley & Sons, Inc. J. Appl. Polym. Sci. 70: 907–912, 1998