线性聚酯酰胺对聚碳酸亚丙酯的改性

Effect of Linear Poly(ester amide) on Properties of Blends with Poly(propylene carbonate)

通过己内酯和氨基己酸开环、缩合反应制备了酯段含量为81%的线性聚酯酰胺(PEA),并用熔融共混的方法制备了PEA/聚碳酸亚丙酯(PPC)共混物,考察了PEA的引入对共混体系相容性、热力学稳定性和机械性能的影响。结果表明,PEA与PPC之间有较好的相容性,共混物的热力学稳定性比PPC有显著提高,当PEA质量分数为3%时,共混体系的起始分解温度(T-5%)和最大分解速率时的温度(Tmax)比PPC分别提高了52.7%和46.4%。通过调节PEA的含量可以使共混体系同时达到增强和增韧的效果。

Linear poly （ester amide） （PEA） with ester segment mass content of 81% was synthesized from 6caprolactone and 6aminocaproic acid by ringopening polymerization and melt polycondensation, which was a kind of biodegradable copolymer with excellent thermal stability and great mechanical properties. Biodegradable polyblends of PEA with poly（ propylene carbonate） （PPC） were prepared by melt b]ending. The effect of PEA content on miscibility, thermal properties and mechanical properties of the blends was investigated. PEA was found to be miscible with PPC and the thermal stability of the blend was significantly improved compared with pure PPC. When the mass ratio of PEA was 3% mass fraction, the temperatures of 5% mass loss（ T5%） and maximum mass loss rate（Tmax） were improved by 52. 7% and 46. 4%, respectively. Moreover, the mechanical properties of the corresponding blends were improved most remarkably, reinforcing and toughening of PPC were achieved simultaneously.