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

Polymers

Yu Hu¹  Wenlong Geng²  Hong You²  You Wang¹ 

[1] School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150001, China; E-Mails:

关键词: ablation;    glass fiber-reinforced composite;    phenolic resin (PR);    silica sol;    silsesquioxanes;    MPMS;    GPMS;    TEOS;    DGEBA;   

DOI  :  10.3390/polym6010105

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.