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采用非异氰酸酯路线合成了1,6-六亚甲基二氨基甲酸羟异丙酯(BPU),分子量为320.利用熔融共混方法制备了聚碳酸1,2-丙二酯(PPC)/BPU共混物.研究发现BPU与PPC间有较好的相容性,随着BPU含量的增加,共混体系的起始热分解温度(Td,5%)可分别增加24～33℃,共混物韧性也显著提高,断裂伸长率最大可增至53.4%,为纯PPC的4倍,且共混物的强度和模量仍维持在较高的数值;BPU含量不超过10 wt%时,可以同时实现共混体系的增韧和增强.剪切屈服和银纹化是PPC/BPU体系得以增韧的最主要机理,而空洞化现象起辅助作用.
Hexylmethylene diisocarboxylate (BPU) was synthesized by non-isocyanate route with a molecular weight of 320. Polycarbonate 1,2-propanediol (PPC) / BPU Blends.The study found that there is a good compatibility between BPU and PPC, with the increase of BPU content, the initial thermal decomposition temperature (Td, 5%) of the blends can be increased by 24 ~ 33 ℃, The toughness of the composites also increased significantly, the elongation at break increased to 53.4% at the maximum, 4 times that of the pure PPC, and the strength and modulus of the blends remained at high values. When the content of BPU was less than 10% The toughening and strengthening of the blends can be achieved at the same time.It is the most important mechanism of PPC / BPU system to be toughened by shear yielding and silver texturing, while the cavitation phenomenon plays an auxiliary role.