Preparation and properties of carbon fabric reinforced modified BMI composites

doi:10.19936/j.cnki.2096-8000.20221128.013

Abstract

Abstract: 4,4'-Dipropargyloxydiphenyl ether (DPEDPE) and N-(3-ethynylphenyl) maleimide (3-EPM) were synthesized as alkynyl-containing modifiers to blend with diphenylmethane bismaleimide (BDM) and diallyl bisphenol A (DABPA) system to prepare modified bismaleimide resins in melting method. The processability, thermal stability, and mechanical properties of alkynyl-containing compounds modified BDM/DABPA resins were studied. The carbon fabric reinforced modified BDM/DABPA composites were molded by hot-press. The thermal-mechanical properties of the composites were also studied. The results show that DPEDPE can broaden the processing window of BDM/DABPA resin. The alkynyl-containing compounds modified BDM/DABPA resins can dissolve in polar solvents except ethanol. The temperature of 5% weight loss (T_d5) and residual yield at 800 ℃ (Y_{r 800 ℃}) in N₂, and glass transition temperature (T_g) of the cured 3-EPM modified BDM/DABPA resin can reach 426 ℃, 37.3% and above 380 ℃, respectively. The tensile strength of the cured BDM/DABPA decreases with addition of DPEDEP or 3-EPM. However, the impact strength of the cured DPEDPE-modified BDM/DABPA can increase to 19.6 kJ·m^-2. The T300 carbon fabric reinforced DPEDPE-modified BDM/DABPA composite possesses the flexural strength of 547 MPa and interlamellar shear strength (ILSS) of 32.8 MPa at room temperature, and retains the strength of 98% at 200 ℃. The flexural strength and ILSS of the composite can keep the flexural strength of the composite for 90%, and ILSS of the composite for 82% at 250 ℃, respectively.

Key words: bismaleimide, alkynyl-containing modifier, blend, composite, heat-mechanical property

CLC Number:

TB332

ZHANG Hui, WANG Lin-xiang, ZHENG Qing, YUAN Qiao-long, HUANG Fa-rong. Preparation and properties of carbon fabric reinforced modified BMI composites[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(11): 90-95.

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