Study on properties of diamine-type benzoxazine modified bisphenol A epoxy resin and its glass fiber reinforced composites

doi:10.19936/j.cnki.2096-8000.20240628.004

Abstract

Abstract: To extend the shelf life of epoxy resin and enhance its heat resistance, benzoxazine resin can be used for blending modification. Blending resin systems (E/B-x) of epoxy resin (EP) and benzoxazine resin (BZ) with different mass ratios were prepared in solution. Their viscosities, rheological properties, gelation activation energies and curing exothermic peaks were tested and analyzed. After the addition of BZ, the viscosities become low and the gelation activation energies increase, which delays the curing reaction to a certain degree. In addition, the copolymerization reaction was analyzed by FTIR technology. Then, the surface properties of the copolymer were investigated and showed that the water contact angle of the copolymer was gradually increased with the increase of addition of BZ. Furthermore, glass cloth reinforced composites were prepared, and their dry and wet T_gs were obtained by DMA. Compared with EP composite, dry and wet T_gs of E/B-40 composite with 40wt% of BZ increase by 12.6% and 11.7%, respectively. Moreover, its flexural strength and modulus achieve 569 MPa and 27.9 GPa, respectively.

Key words: epoxy resin, benzoxazine, copolymerization, wet glass transition temperature, composites

CLC Number:

TB332

CHENG Sheng, XIE Zhihui, HE Weihan, ZHANG Yue, LIANG Zhiming, HUANG Ze, ZHANG Wei, RAN Qichao. Study on properties of diamine-type benzoxazine modified bisphenol A epoxy resin and its glass fiber reinforced composites[J]. COMPOSITES SCIENCE AND ENGINEERING, 2024, 0(6): 29-33.

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