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Non‐Isothermal crystallization of isotactic polypropylene in dotriacontane. I: Effects of dilution, cooling rate, and nucleating agent addition on overall crystallization kinetics
Author(s) -
Lim Gordon B. A.,
Lloyd Douglas R.
Publication year - 1993
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760330904
Subject(s) - crystallization , materials science , tacticity , diluent , differential scanning calorimetry , kinetics , nucleation , isothermal process , polypropylene , polymer chemistry , chemical engineering , dilution , composite material , thermodynamics , polymerization , polymer , nuclear chemistry , chemistry , physics , quantum mechanics , engineering
The overall non‐isothermal crystallization kinetics for nucleated and non‐nucleated isotactic polypropylene (iPP) in dotriacontane systems was investigated. Adipic acid was used as the nucleating agent. Crystallization peak temperature was determined via differential scanning calorimetry as a function of the experimentally controlled variables iPP concentration, cooling rate, and nucleating agent concentration. The influence of these variables on crystallization mechanism and spherulitic structure as implied by the Ozawa and Ziabicki analyses was determined. The non‐isothermal crystallization kinetics presented here are the first for iPP‐diluent systems with and without nucleating agent.