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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

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Received: 16 December 2013; in revised form: 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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

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.

AMA Style

Hu Y, Geng W, You H, Wang Y, Loy DA. 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(1):105-113.

Chicago/Turabian Style

Hu, Yu; Geng, Wenlong; You, Hong; Wang, You; Loy, Douglas A. 2014. "Modification of a Phenolic Resin with Epoxy- and Methacrylate-Functionalized Silica Sols to Improve the Ablation Resistance of Their Glass Fiber-Reinforced Composites." Polymers 6, no. 1: 105-113.


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