Properties of cyanate ester-cured epoxy/polyphenylene oxide blends as a matrix material for Kevlar fiber composites | Health & Environmental Research Online (HERO)

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Citation
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HERO ID

7434793

Reference Type

Journal Article

Title

Properties of cyanate ester-cured epoxy/polyphenylene oxide blends as a matrix material for Kevlar fiber composites

Author(s)

Wu, SJ; Lin, TK; Zhang, JX; Shyu, SS

Year

2000

Is Peer Reviewed?

Yes

Journal

Journal of Adhesion Science and Technology
ISSN: 0169-4243
EISSN: 1568-5616

Publisher

VSP BV

Location

ZEIST

Volume

Issue

Page Numbers

1423-1438

Language

English

DOI

10.1163/156856100742276

Web of Science Id

WOS:000165638300005

URL

http://www.tandfonline.com/doi/abs/10.1163/156856100742276
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Abstract

Epoxy/polyphenylene oxide (PPO) blends were cured with multifunctional cyanate ester resin. The effects of the PPO content on the cure behavior in the cyanate ester-cured epoxy were investigated with Fourier transform infrared spectroscopy (FTIR). The cure reaction in the epoxy/PPO blends was faster than that of the neat epoxy system. FTIR analysis revealed that the cyanate functional group reactions were accelerated by adding PPO and that several co-reactions had occurred, such as cyanate-hydroxyl addition and epoxy-cyanate addition. This was caused by the reaction of cyanate ester with the PPO phenolic end-group and water yielding imidocarbonate and carbamate intermediate which can react with cyanate ester to form cyanurate. Then the cyanurate can react further with the epoxy resin. Thermal mechanical analysis showed that the thermal stability of the epoxy/PPO blends is improved by adding PPO. The morphology of the fiber-rich areas in the composite is different from that of the epoxy/PPO blend without Kevlar fiber. :In the pure polymer blends with high PPO content (30 and 50 phr), phase separation and phase inversion were observed. In the composites, the majority of the epoxy resin migrates to the polar fiber surface, resulting in epoxy-coated fibers. So the interfacial shear strength (IFSS) between Kevlar fiber and the epoxy/PPO blends is almost the same as that between Kevlar fiber and neat epoxy. The presence of PPO does not affect the interfacial property in the epoxy/PPO/fiber composite. So the interlaminar shear strength (ILSS) increase with the PPO content is due to an increase in the composite's ductility or toughness.

Keywords

epoxy; PPO; cyanate ester; Kevlar fiber; epoxy-coated fiber; IFSS; ILSS; composite