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Effect of nucleating agents upon the kinetics of poly(ethylene terephthalate) crystallization
Author(s) -
Przygocki Wladyslaw,
Wlochowicz Andrzej
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.1975.070191004
Subject(s) - crystallization , nucleation , ethylene , materials science , kinetics , chemical engineering , poly ethylene , polymer , polymer chemistry , composite material , chemistry , organic chemistry , catalysis , physics , quantum mechanics , engineering
Experiments have been conducted to examine the effect of the following agents: TiO 2 , CaO, MgO, BaSO 4 , SiO 2 , and Al 2 O 3 as modifiers on the poly(ethylene terephthalate) crystallization kinetics. Modifier concentration in the polymer varied from 0.5% to 3%. Crystallization rate measurements at a temperature of 237°C were performed by dilatometric method and measurements of spherulitic growth rate, by microscopic method. It has been stated that the addition of a modifier affects the crystallization rate, dimension, and homogeneity of spherulitic sizes. The spherulitic growth rate, with the exception of that modified by CaO, does not depend on the kind and the concentration of a modifier. Heterogeneous nucleating agents exert an effect, then, mainly on the heterogeneous nucleation process. In the presence of the agents, the nucleation in the poly(ethylene terephthalate) is of athermal character. The kind of a modifier applied exerts also an effect on the final crystallization degree.