根据分子结构决定性能的原理在PMR-15体系的基础上引入共聚单体PMDE,通过共聚方法合成了一系列BTDE/PMDE共聚PMR聚酰亚胺树脂.探讨了树脂粘度、冲击强度和热氧化稳定性与分子结构的关系规律,并对优化树脂体系通过TGA、DSC和DMTA等手段进行了表征.实验表明随着分子量的增大,树脂粘度增大,热氧化稳定性提高,冲击强度先增大后减小;随PMDE含量的增大,树脂粘度和冲击强度降低,热氧化稳定性提高.
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