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Miscibility and crystallization of thermosetting polymer blends of unsaturated polyester resin and poly(∈-caprolactone)

journal contribution
posted on 1999-02-01, 00:00 authored by G Qipeng, H Zheng
Poly(∈-caprolactone) (PCL) was found to be miscible with uncured polyester resin, i.e. oligoester (OER), as shown by the existence of a single glass transition temperature (T g ) in each blend. However, PCL was judged to be partially miscible with crosslinked polyester resin (PER) which was concluded from the results of thermal analysis. Fourier-transform infrared (FT-i.r.) studies revealed that intermolecular hydrogen bonding interaction between the components is an important driving force to the miscibility of PCL/OER blends and the partial miscibility of crosslinked PCL/PER blends. The importance of entropy contribution to the miscibility of thermosetting polymer blends is also shown from the FT-i.r. results. The spherulitic morphology of the blends was remarkably affected by crosslinking. The birefringent spherulites were observed in the uncured PCL/OER blends, whereas a distinct pattern of extinction rings, which was absent either in the pure PCL or in the uncured PCL/OER blends, was apparent in the crosslinked PCL/PER blends.

History

Journal

Polymer

Volume

40

Issue

3

Pagination

637 - 646

Publisher

Elsevier

Location

London, Eng.

ISSN

0032-3861

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

1998, Elsevier Science