PVC/超支化聚(胺-酯)共混物的冲击与流变性能研究

研究了超支化聚(胺-酯)的代数和用量对PVC/超支化聚(胺-酯)共混体系冲击性能和流变性能的影响,利用扫描电镜对共混体系的冲击断面形态结构进行分析.结果表明:超支化聚(胺-酯)的代数和用量均对共混体系的冲击强度有影响,当加入质量分数为5%的第3代超支化聚(胺-酯)时,共混体系的冲击强度达到42.5 kJ/m2,加入超支化聚(胺-酯)能有效降低共混体系的粘度,并且随着超支化聚(胺-酯)加入量的增多,共混体系流动行为逐渐向牛顿型流体转变,使得PVC的加工可以在较低的温度下进行,从而避免高温引起PVC降解.

The Impact and Rheological Properties of PVC/Hyperbranched Poly(Amine-Ester) Blends

The effect of generations and content of hyperbranched poly(amine-ester) on the impact and rheological properties of the blends of hyperbranched poly(amineester)/PVC are investigated.The micro-configuration of the break surface of the blends is characterized by SEM.The results show that: The extra added hyperbranched poly(amine-ester) can improve the mechanical properties of PVC,and the generation and content of hyperbranched poly(amine-ester) can affect the impact strength of the blends which may reach the maximum value when the content of hyperbranched poly(amine-ester) of third generation is 5%,the impact strength is 42.5 kJ/m~2.The melt rheology measurements showed a reduced complex viscosity gradually for blends and the blends rheological behavior appeared toward Newtonian behavior gradually as the content of hyperbranched poly(amine-ester) increased.Therefore,the PVC materials can be processed at lower temperature in case of possible degradation of PVC at high temperatures.