马来酸酐接枝热塑性弹性体在PP/PA6共混物中的作用

研究了马来酸酐接枝热塑性弹性体 (TPEg )作为增容剂对聚丙烯 (PP) 尼龙 6 (PA6 )共混体系的相容性、相态以及物理力学性能的影响 .研究结果表明TPEg的加入大大改善了PP PA6共混体系的相容性 ,且随TPEg含量的增大分散相粒径明显降低 ,共混物的韧性以及延展性大大提高 ,同时拉伸强度及模量仍保持较好的水平 .TPEg增容的PP PA6共混物的非等温结晶行为的研究表明 ,共混物中PP和PA6的结晶行为不同于各自纯的聚合物 ,PA6作为成核剂使PP的结晶温度提高 ;而PA6由于TPEg的加入 ,出现分级结晶现象 ,一级结晶温度略低于纯PA6的结晶温度 ,且随TPEg含量增大结晶受阻 ,二级结晶温度与PP的接近 .由于PP、PA 6以及TPEg之间存在较强的相互作用 ,三元共混物中PP及PA6的玻璃化转变温度分别较其纯聚合物升高 .基于上述结果 ,提出了本共混体系的结构模型

EFFECT OF MALEIC ANHYDRIDE GRAFTED THERMOPLASTIC ELASTOMER ON PP/PA6 BLENDS

The effects of maleic anhydride grafted thermoplastic elastomer (TPEg) as a compatilizer on the compatibility,morphology and performance of polypropylene/polyamide6 blends were studied.The results showed that TPEg greatly improved the compatibility of the blends.With an increase in TPEg content in the blend,the size of minor component domains decreased greatly and the notched Izod impact strength and elongation at break of the final blends improved obviously.The non-isothermal crystallization behaviors of PP and PA6 in the blends were different from those in their pure polymers.The crystallization temperature of PP was promoted by the PA6 component due to its nucleating effect.While a fractionated crystallization was detected for PA6 when TPEg was used,the first crystallization occurred at a temperature slightly lower than the T c of pure PA6,and was reduced with increasing TPEg content in the blends;the second crystallization happened coincidently with the crystallization of PP.The strong interactions between PP or PA6 and TPEg at the interface increased the T g of the both the PP and PA6 domains in the blends, Based on these observations,a microstructure schematic model was proposed for the PP/PA6/TPEg and PP/PA6/TPE blends.