Because of its flawed toughness, the scope of application of bismaleimide resin (BMI) in the field of aeronautics, industry and electricity is greatly restricted. Herein, a novel Hyperbranched unsaturated polymers (HBP) with the flexible chains grafted was incorporated to reinforce BMI resin’s toughness, where the new interpenetrating networks (IPN) structure was formed. The rich unsaturated double bond of HBP polyester could react with the BMI resin for chemical crosslinking and be used for the toughening agent. ¹³C-NMR and FT-IR were used to characterize HBP’s hyperbranched structure. Consequently, after adding 20 wt.% HBP, the impact strength of BMI modified by HBP increased by 211.1%. In comparison with neat BMI, the flexural strength of BMI modified by HBP was enhanced by 209.3%. It is worth noticing that HBP available in BMI resin significantly improved its electrical performance.

由于其缺陷的韧性，大大限制了双马来酰亚胺树脂（BMI）在航空，工业和电力领域的应用范围。在本文中，引入了具有接枝柔性链的新型超支化不饱和聚合物（HBP），以增强BMI树脂的韧性，从而形成了新的互穿网络（IPN）结构。HBP聚酯的丰富的不饱和双键可与BMI树脂反应进行化学交联，并用作增韧剂。¹³C-NMR和FT-IR用于表征HBP的超支化结构。因此，在添加20重量％的HBP之后，通过HBP改性的BMI的冲击强度增加了211.1％。与纯BMI相比，HBP改性的BMI的抗弯强度提高了209.3％。值得注意的是，BMI树脂中可用的HBP大大改善了其电气性能。