摘要
用红外、扫描电镜、熔体流动速率和力学性能等测试方法 ,研究了甲基丙烯酸缩水甘油酯 ( GMA)和苯乙烯 ( St)多单体熔融接枝聚丙烯 [PP-g-( GMA-co-St) ]对 PA6/PC共混物的反应增容作用 .研究结果表明 ,在熔融共混过程中 ,PP-g-( GMA-co-St)中的环氧基与 PA6的端氨基及 PC的端羟基原位生成的接枝共聚物有效地降低了共混物相间的界面张力 ,明显提高了共混物相界面的粘着力 .少量的 PP-g-( GMA-co-St)就能使 PA6和 PC的相容性得到显著改善 .当 PP-g-( GMA-co-St)的质量分数为 1 0 %时 ,共混物分散相的相区尺寸细化到 0 .2 μm,其力学性能也有较大提高 .PA6/PC/PP-g-( GMA-co-St)共混物的力学性能均衡 ,达到了弹性体增韧体系难以达到的效果 .即使 PP-g-( GMA-co-St)组分含量为 2 0 %时 ,共混物仍能保持较好的力学性能 ,特别是在共混物的韧性得以提高的同时 。
The glycidyl methacrylate(GMA) and styrene(St) multi monomers melt grafted PP, PP g (GMA co St), was used as a reactive compatibilizer of PA6/PC blends in this study. The effect of the addition of PP g (GMA co St) on compatibility of the blends was investigated. It was found that the addition of PP g (GMA co St) greatly reduced the MFR values of the PA6/PC, implying enhanced compatibility between PA6 and PC in the presence of the PP g (GMA co St). The phase morphologies of the blends with increasing content of PP g (GMA co St) were observed by SEM. The particle size of PC decreased with increasing content of PP g (GMA co St) in the blend. Much finer dispersion of discrete polycarbonate phase with average domain size 0 2 μm was reached when the content of the PP g (GMA co St) was 10%(PA6/PC, mass ratio 72/28). This should be due to the formation of the PA6 PP PC copolymer by chemical reactions between GMA in PP g (GMA co St) and the terminal amino or carboxylic groups of PA6 and between GMA in PP g (GMA co St) and terminal -OH group of PC during the melt extrusion process. The formation of PA6 PP PC copolymer is also characterized by FTIR. The mechanical properties of the PA6/PC blends, particularly the Izod impact strength and elongation at break were markedly improved by addition of a small amount of PP g (GMA co St). It should be noted that tensile strength of the PA6/PC/PP g (GMA co St) was also kept with increasing PP g (GMA co St) content. The PA6/PC blends with balanced mechanical properties can be obtained by addition of PP g (GMA co St) .
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2001年第7期1244-1248,共5页
Chemical Journal of Chinese Universities
基金
华南理工大学聚合物成型装备国家工程研究中心科学与技术基金 (批准号 :99-0 0 1)
