PP-g-(MAH/VAc)接枝物对PP/PA6体系的增容作用  

Compatibilization Effect of PP-g-(MAH/VAc)on Polypropylene/Polyamide 6 Blends

作　　者：邱敦瑞[1] 孙玉凤[1] 李书润[1] 杨万泰[1] 

机构地区：[1]北京化工大学有机材料表面工程研究室,北京100029

出　　处：《中国塑料》2008年第7期21-26,共6页China Plastics

摘　　要：通过扫描电镜、差示扫描量热仪和力学性能测试等方法研究了聚丙烯接枝马来酸酐和醋酸乙烯酯(PP-g-MAH/VAc)对聚丙烯/聚酰胺6(80/20)共混体系的增容效果。结果表明,PP-g-(MAH/VAc)用于 PP/PA6共混体系,分散相 PA6的微区尺寸可以减小到5 μm以下,相应地提高了共混物的断裂伸长率、拉伸强度和冲击强度。使用接枝率为5.3%的 PP-g-(MAH/VAc)作为相容剂,当用量为8%时,体系的拉伸强度为60.88 MPa,断裂伸长率为558%,冲击强度为5.28 kJ/m^2。DSC 分析表明,PP/PA6共混体系各组分相互促进成核,结晶度降低。FTIR 结果表明,PP-g-(MAH/VAc)中的 MAH 上的酸酐基团与 PA6中的酰胺键发生了化学反应从而改善了体系的相容性。Scanning electron microscopy （SEM）, differential scanning calorimetry （DSC） and mechanical performance testing were used to investigate the compatibilization of polypropylene （PP）/polyarnide 6 （PA6） blends containing various polypropylene grafted maleic anhydride and vinyl acetate （PP-g-MAH/VAc）. SEM images indicated that the domains of PA6 dispersed in the PP/PA6/PP-g-（MAH/ VAc） blends were significantly reduced to less than 5μm. As 8 % PP-g-MAH/VAc graft polymer with 5.3 % maleic anhydride-co-vinyl acetate was added as a compatibilizer in the blend of PP （80 % ） and PA6 （20 % ）, its elongation at break, tensile strength, and notched impact strength reached 558 %, 60.88 MPa, and to 5.28 kJ/m^2, respectively. The improved compatibility in PP/PA6/PP-g-（MAH/ VAc） blends was attributed to the formation of PP/PA6 copolymer by chemical reactions between anhy- dride of MAH in PP-g-（MAH/VAc） and terminal amino groups of PA6 during the melt mixing, as confirmed by FTIR results.

关 键 词：聚丙烯 聚酰胺6 接枝共聚物 增容作用 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]