Title: DUAL CURE PHENOL – EPOXY RESINS: CHARACTERISATION AND PROPERTIES (short article)
Page Range: p.551-558
Author(s): Devi K A; Nair C P R; Ninan K N
File size: 92K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 11
Issue No: No. 7
Abstract
Reactive blends of 2, 2′-diallyl bisphenol A (DABA) and a novolac epoxy resin (EPN) were investigated for their cure behaviour, and rheological, physical, mechanical and thermal properties. Cure characterization was carried out by differential scanning calorimetry and dynamic mechanical analysis. The system underwent dual curing via a sequential phenol-epoxy reaction and allyl polymerization. The former reaction was catalysed by triphenyl phosphine. Whereas the phenol-epoxy reaction was completed, the allyl polymerisation was limited to 40% by the regulation of cure conditions. It was shown that an increase in epoxy concentration in DABA-EPN blends led to an improvement in the tensile and flexural strengths of the neat castings. Flexural strength and interlaminar shear strength of the glass laminate showed an improvement with an increase in EPN concentration. Although the crosslink density of the neat casting was enhanced by epoxy concentration, this was not shown to result in any significant variations in the Tg of the cured matrix. The dual curing of the matrix system resulted in a considerable improvement, it is claimed, in the flexural properties of their glass composites. 15 refs.
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