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Crystallization kinetics of thermosetting polymer blends of poly(ε-caprolactone) and unsaturated polyester resin

Version 2 2024-06-17, 15:38
Version 1 2017-05-03, 13:36
journal contribution
posted on 2024-06-17, 15:38 authored by Q Guo, H Zheng
A study has been made of the isothermal crystallization kinetics of poly(ε-caprolactone) (PCL) in partially miscible crosslinked polyester resin (PER)/PCL blends by using differential scanning calorimetry (DSC). For comparison, miscible blends of PCL with uncured polyester resin, i.e., oligoester resin (OER), were also investigated. The overall crystallization rate of PCL remarkably decreased with the addition of amorphous component, OER or PER. The kinetic rate constant K n decreased sharply for both the OER/PCL blends and the crosslinked PER/PCL blends with decreasing PCL concentration. The mechanism of nucleation and geometry of the growing PCL crystals was not remarkably affected by the incorporation of OER, but changed considerably with the addition of PER. However, the overall crystallization rate of PCL in the crosslinked PER/PCL blends was much higher compared with the corresponding uncured OER/PCL blends, which is attributable to the phase-separated structure and the reduced miscibility in the crosslinked blends. According to the nucleation and growth theories, the nucleation process was considered to be the rate controlling step in the crystallization.

History

Journal

Journal of Applied Polymer Science

Volume

74

Pagination

322-327

Location

Hoboken, N.J.

ISSN

0021-8995

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

1999, John Wiley & Sons

Issue

2

Publisher

John Wiley & Sons

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