Phase behavior, crystallization, and morphology in thermosetting blends of a biodegradable poly(ethylene glycol)-type epoxy resin and poly(ε-caprolactone)

Guo, Q. P., Slavov, S. and Halley, P. J. (2004) Phase behavior, crystallization, and morphology in thermosetting blends of a biodegradable poly(ethylene glycol)-type epoxy resin and poly(ε-caprolactone). Journal of Polymer Science Part B-polymer Physics, 42 15: 2833-2843. doi:10.1002/polb.20158


Author Guo, Q. P.
Slavov, S.
Halley, P. J.
Title Phase behavior, crystallization, and morphology in thermosetting blends of a biodegradable poly(ethylene glycol)-type epoxy resin and poly(ε-caprolactone)
Journal name Journal of Polymer Science Part B-polymer Physics   Check publisher's open access policy
ISSN 0887-6266
Publication date 2004
Sub-type Article (original research)
DOI 10.1002/polb.20158
Volume 42
Issue 15
Start page 2833
End page 2843
Total pages 11
Editor Robert M. Briber
Place of publication Hoboken
Publisher John Wiley & Sons Inc
Collection year 2004
Subject C1
291401 Polymers
670705 Plastic products (incl. construction materials)
Abstract Thermosetting blends of a biodegradable poly(ethylene glycol)-type epoxy resin (PEG-ER) and poly(epsilon-caprolactone) (PCL) were prepared via an in situ curing reaction of poly(ethylene glycol) diglycidyl ether (PEGDGE) and maleic anhydride (MAH) in the presence of PCL. The miscibility, phase behavior, crystallization, and morphology of these blends were investigated. The uncured PCL/PEGDGE blends were miscible, mainly because of the entropic contribution, as the molecular weight of PEGDGE was very low. The crystallization and melting behavior of both PCL and the poly(ethylene glycol) (PEG) segment of PEGDGE were less affected in the uncured PCL/PEGDGE blends because of the very close glass-transition temperatures of PCL and PEGDGE. However, the cured PCL/PEG-ER blends were immiscible and exhibited two separate glass transitions, as revealed by differential scanning calorimetry and dynamic mechanical analysis. There existed two phases in the cured PCL/PEG-ER blends, that is, a PCL-rich phase and a PEG-ER crosslinked phase composed of an MAH-cured PEGDGE network. The crystallization of PCL was slightly enhanced in the cured blends because of the phase-separated nature; meanwhile, the PEG segment was highly restricted in the crosslinked network and was noncrystallizable in the cured blends. The phase structure and morphology of the cured PCL/PEG-ER blends were examined with scanning electron microscopy; a variety of phase morphologies were observed that depended on the blend composition. (C) 2004 Wiley Periodicals, Inc.
Keyword Polymer Science
Biodegradable
Epoxy Resin
Poly(epsilon-caprolactone)
Poly(ethylene Glycol)
Thermosetting Blends
Miscibility
Phase Behavior
Unsaturated Polyester Resin
Poly-epsilon-caprolactone
Oxide) Blends
Semicrystalline Morphology
Multiblock Copolymers
Block-copolymers
Kinetics
Nanostructures
Degradation
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 03:14:48 EST