尼龙/乙烯-醋酸乙烯酯共聚物接枝马来酸酐共混体系的研究  

Study on PA66/EVA Copolymer Grafted Maleic Anhydride Blends

作　　者：张军[1] 陈民杰[1] 万吴军[1] 殷会玉 

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009

出　　处：《中国塑料》2003年第2期33-38,共6页China Plastics

摘　　要：通过双螺杆挤出机利用熔融挤出法制备了增韧的尼龙 66/乙烯 -醋酸乙烯酯共聚物接枝马来酸酐共混物(PA66/EVA g MAH)。实验结果表明 ,未经接枝改性的EVA与PA66是不相容的 ,对增韧PA66几乎没有贡献 ,而EVA g MAH则出现了明显的增韧效果。在熔融挤出过程中 ,PA66与EVA g MAH发生了原位化学反应 ,生成了PA66 EVA共聚物。这种共聚物细化了分散相尺寸 ,使得分散相在PA66基体中分散得更均匀 ,提高了两相的相容性。同时增强了两相界面间的结合力 ,使得应力能够在两相间有效地传递 ,这种界面形态的改善直接影响到共混物力学性能的变化。随着EVA g MAH含量的增加 ,PA66/EVA g MAH共混物的冲击强度提高 ,当PA66/EVA g MAH的共混比为 70 / 30 (质量比 )时 ,体系发生了脆韧转变 ,冲击强度达到了最大 ,比纯PA66、PA66/EVA( 70 / 30 )共混物提高了 12倍。和PE g MAH、PP g MAH相比 ,EVA gSuper-tough polyamide 66(PA66) was prepared by using ethylene vinyl acetate copolymer (EVA) grafted with maleic anhydride(EVA-g-MAH) as a compatibilizer in a twin-screw extruder.The experimental results showed that the unmodified EVA was uncompatible with PA66 and had hardly any contribution to the toughness of PA66,whereas the EVA-g-MAH had an obvious compatibilizing and toughening effect on PA66.During the melt extrusion process,the in-site reaction between PA66 and EVA-g-MAH was performed and the in-site PA66-g-EVA graft copolymer was formed,which acted as an interfacial agent between the elastomer disperse phase and the PA66 matrix.The in-site PA66-g-EVA graft copolymer improved the dispersion and interfacial morphology. The improvement of morphology directly affected mechanical properties of PA66/EVA-g-MAH blends. A transition from brittle to ductile occurred in the PA66/EVA-g-MAH blend with composition ratio of 70:30(mass ratio) and the maximum impact strength was obtained,which was about twelve times higher than that of PA66/EVA blend.Compared with PE-g-MAH and PP-g-MAH,the toughening effect of EVA-g-MAH was the best.

关 键 词：尼龙/乙烯-醋酸乙烯酯共聚物 接枝 马来酸酐共混体系 研究 增韧 

分 类 号：TQ342.12[化学工程—化纤工业]