PREPARATION AND STUDY OF TOUGHENED BISMALEIMIDE RESIN MODIFIED BY BENZOXAZINE

Abstract

Abstract: The unmodified pure bismaleimide resin has the shortcomings of poor solubility, high curing processing temperature and ease of brittleness fracture. 2,2′-Diallylbisphenol A (DABPA) and 3-aminophenylacetylene (m-APA) as chain extender toughening agent, bisphenol A phenylbenzoxazine (BOZ) as toughened agent were adopted to copolymerize with 4,4′-bismaleimidodiphenyl methane (BDM) resin. Then, a kind of resin matrix was prepared, which presented high temperature resistance and high toughness. The curing reaction of BOZ/BAD422 resin system was studied by Fourier transform-infrared spectroscopy and differential scanning calorimetry analyses, respectively. Mechanical measurements, thermal properties analysis, and microanalyses were conducted to assess the toughness and morphology of the cured blends. The research results show that the addition of BOZ resin can effectively increase the BMI resin toughness. In the range of 0~30wt% BOZ resin, the impact performance of the blended resin system is increased with the increase of the quality fraction of BOZ resin. The maximum impact performance reaches up to 18.3 kJ/m², which was 53.8% higher than the BAD422 system. The bending strength is slightly increased and remains at a high level compared with the BAD422 system, reaching at 145.9 MPa. The bending modulus slowly increases with the increase of BOZ content. However, heat resistance and thermal stability are reduced. But glass transition temperature (T_g) can still reach 250.8 ℃ and the initial decomposition temperature (T_5%) is 346.5 ℃ after the addition of 30wt% BOZ, indicating that the thermal performance is still good.

Key words: bimaleimide, benzoxazine, toughening, heat-resistance

CLC Number:

TB332

ZHOU Ru-jin, WANG Xiang, WANG Jun, CAI Hao-peng. PREPARATION AND STUDY OF TOUGHENED BISMALEIMIDE RESIN MODIFIED BY BENZOXAZINE[J]. Fiber Reinforced Plastics/Composites, 2018, 0(12): 21-27.

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