PBT/PC/E-MA-GMA三元共混体系的力学性能与亚微相态

将乙烯-丙烯酸甲酯-甲基丙烯酸缩水甘油酯(E-MA-GMA)三元共聚物与聚碳酸酯(PC)增韧聚对苯二甲酸丁二酯(PBT),研究了其力学性能、亚微相态和强韧化机制。结果表明,当m(PBT)／m(PC)为50:50,三元共混体系在w(E-MA-GMA)为10％时,缺口冲击强度达93 kJ／m2,同时拉伸强度达到54 MPa。扫描电子显微镜观察发现,E- MA-GMA作为柔性界面层,起到反应性增容作用,使PC分散相的相畴尺寸变小。PC相特有的相形态以及柔性界面层的存在是三元共混体系强韧化的主要机制。

Mechanical properties and sub-microscopic phase state of ternary system of PBT/PC/E-MA-GMA

This paper studied the mechanical properties, sub-microscopic phase state and mechanism of strengthening and toughening of poly(butylene terephthalate) (PBT) modified with ethylene-methyl acrylate- glyceryl methacrylate terpolymer (E-MA-GMA) and polycarbonate (PC). The notched impact strength and tensile strength of the ternary blend system reached 93 kJ/m2 and 54 MPa, respectively, when the mass ratio of PBT to PC was 50 : 50 and the mass fraction of E-MA-GMA was 10%. The observation by scanning electron microscope clearly revealed that E-MA-GMA as soft interfacial layer played a function of reactive compatibilizer and made the dimension of the phase domain of PC as dispersive phase become smaller. The formation of the unique phase morphology of PC and the soft interfacial layer constituted the principal course in the mechanism of strengthening and toughening of the ternary blend system.