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Indexed by:期刊论文

Date of Publication:2016-12-05

Journal:MATERIALS & DESIGN

Included Journals:SCIE、EI、Scopus

Volume:111

Page Number:453-462

ISSN No.:0264-1275

Key Words:Epoxy resin; Benzoxazine; Silica; Thermal property; Mechanical behavior

Abstract:Trialkoxy-terminated benzoxazine monomer was synthesized using bisphenol A (BPA), 3-aminopropyltriethoxysilane (KH-550) and paraformaldehyde. Subsequently, bisphenol F epoxy resin (F51) was pretreated with 3-isocyanatopropyltriethoxysilane (IPTS) to covalently introduce trialkoxy group into the epoxy molecular. Sol-gel process was then initiated with tetraethoxysilane (TEOS) as precursor to introduce silica structure into epoxy-benzoxazine hybrid before curing reaction. The synthesized benzoxazine and epoxy resin containing trialkoxysilane group were used as silane coupling agent to connect epoxy-benzoxazine matrix as organic domain and silica units as inorganic domain. Thermal gravimetric analysis (TGA) and dynamic mechanical analysis (DMA) show that the organic-inorganic ternary copolymer possesses promoted thermal stability compared with the unmodified epoxy-benzoxazine matrix. The char residues of the ternary copolymer after decomposition test reveal a dense surface layer and unbroken original dimension which is in accordance with the TGA results. According to the results of the mechanical tests and DMA, the SiO2/epoxy-benzoxazine copolymer possesses improved toughness and is more capable of absorbing deformation energy under external force. (C) 2016 Elsevier Ltd. All rights reserved.