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Polymers and Polymer Composites

NON-ISOTHERMAL CURE KINETICS OF POLYBENZOXAZINE/CARBON FIBER COMPOSITES BY PHASE CHANGE THEORY

June 1, 2005 By: Chunling Xin; Xiaoping Yang; Dingsheng Yu Research article

Title: NON-ISOTHERMAL CURE KINETICS OF POLYBENZOXAZINE/CARBON FIBER COMPOSITES BY PHASE CHANGE THEORY
Page Range: p.599-605
Author(s): Chunling Xin; Xiaoping Yang; Dingsheng Yu
File size: 124K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 13
Issue No: No. 6

Abstract
The curing of benzoxazines (BA-a) and benzoxazine/carbon fibre composites (BA-a/CF), was monitored and compared using non-isothermal differential scanning calorimetry, at various heating rates. The results showed that the initial cure temperature of BA-a/CF was lower that of BA-a at the same heating rate. Various kinetic parameters and apparent activation energies for both curing systems were obtained using a modified version of the Avrami equation. The change in the Avrami component with cure temperature is reported to reflect two different stages of the benzoxazine cure reaction: the microgel formation, growth stage and the diffusion-controlled stage, The activation energy obtained from the Avrami rate constant for neat benzoxazine was shown to closely agree with earlier values reported by another method. For BA-a/CF composites, the activation energies obtained from the Avrami rate constant reflected the effect of the carbon fibres on the cure behaviour of benzoxazine. The cure reaction of benzoxazines was found to be not only catalysed by carbon fibre, but also retarded by it. 19 refs.

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