共混方式对ABS/PA6/SMA共混体系形态和力学性能的影响

Influence of Blending Sequence on Morphology and Mechanical Properties of PA6/ABS Blend Compatibilized by Styrene-Maleic Anhydride Copolymer

以苯乙烯-马来酸酐共聚物(SMA)为反应增容剂,研究不同共混工艺和ABS/PA6配比对三共混体系聚集态结构和力学性能的影响。结果表明:SMA对共混体系增容效果显著,并明显改善了ABS/PA6共混体系的力学性能。其中当PA6用量为30份和40份时,SMA先与ABS共混再与PA6共混的方式所生成共混物的性能优于SMA先与PA6共混再与ABS共混的方式。PA6用量为30份时性能最好,共混物的分散相尺寸达到最小值0.31μm,分散相颗粒PA6周长面积比为最大值0.46,拉伸强度和冲击强度也分别为最大值63.2 MPa和8.29 kJ/m^2。当PA6用量达到45份时,共混方式对共混物的力学性能影响不大。研究表明,当ABS为连续相时,共混方式可以强烈地影响ABS/PA6共混物体系的聚集态结构和力学性能,而PA6和ABS向共连续相发展时,共混方式对ABS/PA6聚集态结构和力学性能则影响不大。

ABS/PA6 blends compatibilized by styrene-maleic anhydride （SMA） were prepared in a corotating twin-screw extruder, the influence of blending sequence was studied through observation of SEM. The relationship between morphology of PA6/ABS/SMA blends and mechanical properties was also discussed. The compatibility between PA6 and ABS was improved remarkably by adding SMA. When the content of PA6 was between 30 and 40 parts, ABS constituted the continuous phase, the blending sequences had major influence on the morphology structure and mechanical properties. SMA should be blended with ABS first and the PA6 was subsequently introduced. Thus obtained PA6 domains possessed small sizes about 0.31μm, leading to tensile and impact strengths of 63.2 MPa and 8. 29 kJ/m^2, respectively. However, when the content of PA6 was about 45 parts, the blend possessed a co-continuous morphology, the blending sequences had minor influences.