Simultaneously Enhancing Processability and Heat Resistance for Bismaleimide Resins via Forming Eutectic

Authors:
  • YGYing Guo
    Ying Guo
  • HDHaotian Ding
    Haotian Ding
  • CSChengyuan Shang
    Chengyuan Shang
  • XZXiaobiao Zuo
    Xiaobiao Zuo
  • HZHeng Zhou
    Heng Zhou
  • TZTong Zhao
    Tong Zhao
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Abstract
Simultaneously improving the processability and heat resistance for bismaleimide (BMI) resins remains an open challenge. Herein, the processing performance of traditional BMIs with high melting points, including m-phenylene bismaleimide (MPD-BMI), 3,3'-diphenylsulfone bismaleimide (33DDS-BMI) and bisphenol A bismaleimide (BDM), is significantly improved by forming eutectic systems though blending with low-melting-point BMI monomers, indan bismaleimide (PIDA-BMI) and aliphatic bismaleimide trimethylhexane bismaleimide (SEM23). The results show that, after PIDA-BMI modified 33DDS-BMI systems, the melting point decreases as high as 60% and the glass transition temperature (Tg) increases by 6%, compared with 33DDS-BMI systems. Similarly, for SEM23/BDM system, the melting point decreases by 14%, Tg increasesand and the flexural strength increases by by 13% and 10% respectively, compared with pure BDM system. Mechanistic analysis reveals that introducing low-melting-point BMI monomers forms a eutectic system, inducing amorphization of polycrystalline states through BMI structural differences. This reduces resin crystallinity and enhances segmental mobility, thereby synergistically optimizing melting point, heat resistance, and mechanical properties. This work provides a strategy for simultaneously enhancing processability and heat resistance for BMI resins.

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