【摘要】 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。更多还原

【Abstract】 A series of BTDE/PMDE copolymer PMR resin was synthesized by introducing a second monomer to PMR15 system on the principle that material properties depend on its molecular structure. The relations between properties such as resin viscosity, impact strength and thermooxidative stability and molecular structure were discussed. Simultaneously, the optimal resin system was characterized by TGA, DSC and DMTA. Experiment shows that with increasing of the molecular weight, the resin viscosity and thermooxidative stability increase, while the impact strength decreases after increasing. With increasing of PMDE content, the resin viscosity and impact strength decrease, while the thermooxidative stability increases.更多还原