Lin Jia-Horng, Huang Chien-Lin, Liu Chi-Fan, Chen Chih-Kuang, Lin Zheng-Ian, Lou Ching-Wen
Laboratory of Fiber Application and Manufacturing, Department of Fiber and Composite Materials, Feng Chia University, Taichung City 40724, Taiwan.
School of Chinese Medicine, China Medical University, Taichung City 40402, Taiwan.
Materials (Basel). 2015 Dec 2;8(12):8279-8291. doi: 10.3390/ma8125451.
This study uses the melt compounding method to produce polypropylene (PP)/short glass fibers (SGF) composites. PP serves as matrix while SGF serves as reinforcement. Two coupling agents, maleic anhydride grafted polypropylene, (PP-g-MA) and maleic anhydride grafted styrene-ethylene-butylene-styrene block copolymer (SEBS-g-MA) are incorporated in the PP/SGF composites during the compounding process, in order to improve the interfacial adhesion and create diverse desired properties of the composites. According to the mechanical property evaluations, increasing PP-g-MA as a coupling agent provides the composites with higher tensile, flexural, and impact properties. In contrast, increasing SEBS-g-MA as a coupling agent provides the composites with decreasing tensile and flexural strengths, but also increasing impact strength. The DSC results indicate that using either PP-g-MA or SEBS-g-MA as the coupling agent increases the crystallization temperature. However, the melting temperature of PP barely changes. The spherulitic morphology results show that PP has a smaller spherulite size when it is processed with PP-g-MA or SEBS-g-MA as the coupling agent. The SEM results indicate that SGF is evenly distributed in PP matrices, but there are distinct voids between these two materials, indicating a poor interfacial adhesion. After PP-g-MA or SEBS-g-MA is incorporated, SGF can be encapsulated by PP, and the voids between them are fewer and indistinctive. This indicates that the coupling agents can effectively improve the interfacial compatibility between PP and SGF, and as a result improves the diverse properties of PP/SGF composites.
本研究采用熔融共混法制备聚丙烯（PP）/短玻璃纤维（SGF）复合材料。PP作为基体，而SGF作为增强体。在共混过程中，将两种偶联剂，即马来酸酐接枝聚丙烯（PP-g-MA）和马来酸酐接枝苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚物（SEBS-g-MA）加入到PP/SGF复合材料中，以提高界面附着力并赋予复合材料各种所需性能。根据力学性能评估，增加PP-g-MA作为偶联剂可使复合材料具有更高的拉伸、弯曲和冲击性能。相比之下，增加SEBS-g-MA作为偶联剂会使复合材料的拉伸强度和弯曲强度降低，但冲击强度增加。差示扫描量热法（DSC）结果表明，使用PP-g-MA或SEBS-g-MA作为偶联剂均会提高结晶温度。然而，PP的熔融温度几乎没有变化。球晶形态结果表明，当以PP-g-MA或SEBS-g-MA作为偶联剂进行加工时，PP的球晶尺寸较小。扫描电子显微镜（SEM）结果表明，SGF均匀分布在PP基体中，但这两种材料之间存在明显的空隙，表明界面附着力较差。加入PP-g-MA或SEBS-g-MA后，SGF可被PP包裹，它们之间的空隙较少且不明显。这表明偶联剂可有效改善PP与SGF之间的界面相容性，从而改善PP/SGF复合材料的各种性能。
