Liu Jingru, Zhu Xinxu, Cao Zheng
Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials, School of Materials Science and Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou 213164, China.
Polymers (Basel). 2019 Nov 16;11(11):1894. doi: 10.3390/polym11111894.
The influence of poly(acrylonitrile-butadiene-styrene) (ABS) as a special β-nucleating agent on the impact and tensile properties of isotactic polypropylene (iPP) were investigated by dynamic rheological measurements, wide-angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), and mechanical properties tests. It is found that the β nucleation efficiency of ABS is closely related to its concentration, dispersibility, and molding method for the iPP/ABS blends. The content of β-crystal () rises with the incorporation of ABS and shows a maximum with the introduction of 1% ABS for compression-molded blends and 2% ABS for injection-molded blends, respectively, which is followed by a decrease in . The addition of a small amount of ABS has a significant reinforcing and toughening effect on iPP. Compared with the compression-molded samples, the ABS dispersed phase in injection-molded samples has a smaller particle size and a larger specific surface area, which are favorable for stress transmission and higher β nucleation efficiency, and therefore, better tensile and impact properties can be expected.
通过动态流变测量、广角X射线衍射（WAXD）、差示扫描量热法（DSC）、扫描电子显微镜（SEM）和力学性能测试，研究了聚（丙烯腈-丁二烯-苯乙烯）（ABS）作为一种特殊的β成核剂对全同立构聚丙烯（iPP）冲击性能和拉伸性能的影响。发现ABS的β成核效率与其在iPP/ABS共混物中的浓度、分散性和成型方法密切相关。β晶型（）的含量随着ABS的加入而增加，对于压缩成型共混物，在加入1%ABS时达到最大值，对于注塑成型共混物，在加入2%ABS时达到最大值，随后含量下降。少量ABS的加入对iPP有显著的增强和增韧作用。与压缩成型样品相比，注塑成型样品中的ABS分散相粒径更小、比表面积更大，有利于应力传递和更高的β成核效率，因此，可以预期具有更好的拉伸性能和冲击性能。
