论文部分内容阅读
以马来酸酐接枝(苯乙烯/乙烯/丁烯/苯乙烯)共聚物(SEBS-g-MAH)为增韧剂制备出了一系列超韧尼龙(PA)1111/SEBS-g-MAH共混体系,并对其力学性能和微观结构进行了研究。结果表明,随着增韧剂含量的增加,共混体系的缺口冲击强度显著提高,当增韧剂质量分数为25%时,缺口冲击强度为39.4kJ/m2,是纯PA1111的11.3倍。微观结构研究表明,PA1111的断裂属于韧性断裂,PA1111/SEBS-g-MAH共混体系的缺口冲击断面有明显的应力发白现象,冲击强度提高的主要原因在于应力集中点的增多而引发大量银纹所致。
A series of super-tough nylon (PA) 1111 / SEBS-g-MAH copolymers were prepared by using maleic anhydride grafted (styrene / ethylene / butylene / styrene) copolymer (SEBS-g-MAH) Mixed system, and its mechanical properties and microstructure were studied. The results showed that the notched impact strength of blends increased significantly with the increase of toughener content. When the toughening agent content was 25%, the notched impact strength was 39.4 kJ / m2, which was 11.3 times that of pure PA1111. The microstructure studies show that the fracture of PA1111 belongs to ductile fracture. The notched impact section of PA1111 / SEBS-g-MAH blends has obvious stress whitening phenomenon. The main reason for the increase of impact strength is the increase of stress concentration point and the large amount of silver Caused by the pattern