Modification of a phenolic resin with epoxy- and methacrylate-functionalized silica sols to improve the ablation resistance of their glass fiber-reinforced composites

Yu Hu, Wenlong Geng, Hong You, You Wang, Douglas A. Loy

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Functionalized silica sols were obtained by the hydrolytic condensation of (γ-methacryloxypropyl)trimethoxysilane (MPMS), (γ-glycidyloxypropyl)trimethoxysilane (GPMS) and tetraethoxysilane (TEOS). Three different sols were obtained: MPS (derived from MPMS and TEOS), GPS-MPS (derived from GPMS, MPMS and TEOS), and GPSD (derived from GPMS, TEOS and diglycidyl ether of bisphenol A, DGEBA). These silica sols were mixed with a phenolic resin (PR). Ethylenediamine was used as a hardener for epoxy-functionalized sols and benzoyl peroxide was used as an initiator of the free-radical polymerization of methacrylate-functionalized silica sols. Glass fiber-reinforced composites were obtained from the neat PR and MPS-PR, GPS-MPS-PR and GPSD-PR. The resulting composites were evaluated as ablation resistant materials in an acetylene-oxygen flame. A large increase in the ablation resistance was observed when the PR was modified by the functionalized silica sols. The ablation resistance of the composites decreased as follows: GPSD-PR > MPS-PR > GPS-MPS-PR > PR.

Original languageEnglish (US)
Pages (from-to)105-113
Number of pages9
JournalPolymers
Volume6
Issue number1
DOIs
StatePublished - Jan 1 2014

Keywords

  • Ablation
  • DGEBA
  • GPMS
  • Glass fiber-reinforced composite
  • MPMS
  • Phenolic resin (PR)
  • Silica sol
  • Silsesquioxanes
  • TEOS

ASJC Scopus subject areas

  • Chemistry(all)
  • Polymers and Plastics

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