PBT/ABS反应增容体系的相形态及动态流变行为

Morphological Evolution and Viscoelastic Behavior of MGE-Compatibilized PBT/ABS Blends

以甲基丙烯酸甲酯-甲基丙烯酸缩水甘油酯-丙烯酸乙酯三元共聚物(MGE)为增容剂对聚对苯二甲酸丁二醇酯/丙烯腈-丁二烯-苯乙烯共聚物(PBT/ABS)共混体系进行增容。采用扫描电镜(SEM)和旋转流变仪等表征方法,研究了增容剂对PBT/ABS(70/30)共混体系的相形态及动态流变性能的影响。SEM分析结果表明,随着MGE用量的增加,共混体系中分散相的粒径逐渐减小,且分散更均匀。这可能是由于MGE的加入可原位生成PBT-g-MGE共聚物,使共混体系相容性得到显著改善。旋转流变实验结果表明,随着MGE用量的增加,体系黏度不断增加,低频模量随频率的变化趋势逐渐减小,并出现了"第二平台",这同样说明了体系中两相的界面处生成了对体系具有明显增容作用的第三相(PBT-g-MGE共聚物)。

Morphologies and viscoelastic behaviors of poly （butylenes terephthalate）/ （acrylonitrile-butadiene- styrene） （PBT/ABS） blends compatibilized by MGE were studied by scanning electron microscope （SEM） and dynamic rheological testing. It is clear show that methyl methacrylate-glycidyl methacrylate-ethyl acrylate terpolymers （MGE） can significantly improve the compatibility between PBT and ABS due to the in-situ formation of graft copolymer（PBT-g-MGE）. With the increasing of MGE content, the particles disperse more homogeneously in the PBT/ABS system and the size of particles dreases. The results of dynamic rheological test show that at low frequency, the dependence of system＇s modulus upon frequency decreases with the increase of the MGE content, and the curves form ＂second plateau＂, suggesting that the entanglement is strengthen between the macromolecular chains due to the formation of PBT-g-MGE copolymer.