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Crystallization kinetics of crosslinkable polymer complexes of novolac resin and poly(ethylene oxide)

journal contribution
posted on 1999-10-01, 00:00 authored by Z Zhong, Qipeng Guo
Results of a study on the isothermal crystallization and thermal behavior of both uncured and hexamine-cured novolac/poly(ethylene oxide) (PEO) complexes are reported. The crystallization behavior of PEO in complexes is strongly influenced by factors such as composition, crystallization temperature, complexation, and crosslinking. The time dependence of the relative degree of crystallinity at high conversion deviated from the Avrami equation. The cured complexes exhibited an obvious two-stage crystallization (primary crystallization and crystal perfection), and this was more evident at higher crystallization temperature and high PEO-content. The addition of a noncrystallizable component into PEO caused a depression of both the overall crystallization rate and the melting temperature. In general, complexation and curing resulted in an increase in the overall crystallization rate. Complexation and curing are beneficial to the nucleation of PEO. Additionally, curing led to changes of the nucleation mechanism. Experimental data on the overall kinetic rate constant K n were analyzed by means of the nucleation and crystal growth theory. For uncured complexes, the surface free energy of folding, σ e , increased with increasing novolac content, whereas for cured complexes, σ e displayed a maximum with the variation of composition.

History

Journal

Journal of polymer science, part B: polymer physics

Volume

37

Issue

19

Pagination

2726 - 2736

Publisher

Wiley

Location

Hoboken, N.J.

ISSN

0887-6266

eISSN

1099-0488

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

1999, Wiley