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Polymers 2014, 6(1), 105-113; doi:10.3390/polym6010105
Article

Modification of a Phenolic Resin with Epoxy- and Methacrylate-Functionalized Silica Sols to Improve the Ablation Resistance of Their Glass Fiber-Reinforced Composites

1,* , 2
,
2
,
1,*  and 3
1 School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China 2 State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150001, China 3 Department of Materials Science and Engineering, the University of Arizona, Tucson, AZ 85721, USA
* Authors to whom correspondence should be addressed.
Received: 16 December 2013 / Revised: 26 December 2013 / Accepted: 30 December 2013 / Published: 6 January 2014
(This article belongs to the Special Issue Polymer Colloids)
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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.
Keywords: ablation; glass fiber-reinforced composite; phenolic resin (PR); silica sol; silsesquioxanes; MPMS; GPMS; TEOS; DGEBA ablation; glass fiber-reinforced composite; phenolic resin (PR); silica sol; silsesquioxanes; MPMS; GPMS; TEOS; DGEBA
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Hu, Y.; Geng, W.; You, H.; Wang, Y.; Loy, D.A. Modification of a Phenolic Resin with Epoxy- and Methacrylate-Functionalized Silica Sols to Improve the Ablation Resistance of Their Glass Fiber-Reinforced Composites. Polymers 2014, 6, 105-113.

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