Bismaleimide (BMI) resins have poor toughness due to their high crosslink density, which limits their wide development and application. In this study, the amino‐terminated poly(phthalazinone ether nitrile sulfone) (PPENS‐DA) resin was designed and the curing agent of 3,3′‐diallyl‐4,4′‐biphenol (DABP) was synthesized to toughen N,N′‐(4,4′‐diphenylmethane) bismaleimide (BDM) resin. The impact strength, flexural strength and fracture surface structures of the DABP/BDM and PPENS‐DA/DABP/BDM blends were studied. The results showed that the notched impact strength of the blends with 10‐phr PPENS‐DA is 4.98 kJ/m², which was 36% higher than that of pristine BDM/DABP blend and 200% higher than that of the 2,2′‐diallyl bisphenol A (DABPA) modified BMI resin system. The glass transition temperature (T_g) has been improved from 247 to 269°C for the blend system as evidenced by DMA. Rheological behavior analysis indicated that the blend system has a broad processing window (90‐175°C) with low viscosity of less than 1 Pa·s and low curing activation energy of 67.2 kJ/mol.

中文翻译：

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基于反应性氨基末端聚（酞嗪酮醚腈砜）和带有双酚基的双烯丙基的协同效应，提高了双马来酰亚胺树脂的韧性和热性能

双马来酰亚胺（BMI）树脂由于其高交联密度而具有较差的韧性，这限制了它们的广泛开发和应用。在这项研究中，设计了氨基末端的聚（酞嗪酮醚腈砜）（PPENS-DA）树脂，并合成了3,3'-diallyl-4,4'-Biphenol（DABP）的固化剂以增韧N，N '-（4,4'-二苯甲烷）双马来酰亚胺（BDM）树脂。研究了DABP / BDM和PPENS‐DA / DABP / BDM共混物的冲击强度，弯曲强度和断裂表面结构。结果表明，10phr PPENS‐DA共混物的缺口冲击强度为4.98 kJ / m ²，比原始的BDM / DABP混合物高36％，比2,2'-二烯丙基双酚A（DABPA）改性的BMI树脂体系高200％。DMA证明，共混体系的玻璃化转变温度（T _g）从247℃提高到269℃。流变行为分析表明，共混体系的加工窗口宽（90-175°C），低粘度小于1 Pa·s，固化活化能低至67.2 kJ / mol。