Mechanical behavior and fracture toughness evaluation of maleic anhydride compatibilized short glass fiber/SEBS/polypropylene hybrid composites
Mechanical behavior and fracture toughness evaluation of maleic anhydride compatibilized short glass fiber/SEBS/polypropylene hybrid composites
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DOI：
10.1016/s0266-3538(02)00037-4
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发表时间：
2002-05
影响因子：
9.1
通讯作者：
S. Tjong;Shiai Xu;R. Li;Y. Mai
中科院分区：
文献类型：
--
作者：
S. Tjong;Shiai Xu;R. Li;Y. Mai
用苯乙烯-乙烯-丁烯-苯乙烯（SEBS）三嵌段共聚物增韧短玻璃纤维（SGF）增强聚丙烯复合材料。研究了马来酸酐官能团对混杂复合材料力学性能的影响。在本研究中，MA接枝到PP （PP-g-MA）或SEBS共聚物（SEBS-g-MA）上。将95% PP与5% PP-g- ma复配，制备了mPP共混物。混合复合材料的基体由SEBS/mPP或SEBS-g- ma /mPP组成。拉伸试验表明，SGF对恢复SEBS/mPP共混物的刚度有良好的作用。SEBS/mPP的冲击测试显示出优异的冲击强度。然而，在SEBS/mPP和SEBS-g- ma /mPP共混物中加入SGF大大降低了冲击强度。SEM观察表明，SGF/SEBS/mPP和SGF/SEBS-g- ma /mPP杂化材料的SGF表面都包覆了一层薄的基体材料。这表明mPP的MA官能团改善了SGF与PP之间以及SGF与SEBS之间的粘附。断裂基本工作（EWF）表明，SGF与PP之间的强界面结合不利于SGF/SEBS/mPP和SGF/SEBS-g- ma /mPP三元复合材料的断裂韧性。动态力学分析表明，SGF增加了混合材料的存储模量，但降低了阻尼系数的强度。
Short glass fiber (SGF) reinforced polypropylene composites toughened with styrene-ethylene-butylene-styrene (SEBS) triblock copolymer were injection molded. The effect of maleic anhydride (MA) functional group on the mechanical performance of the hybrid composites was investigated. In this study, MA was either grafted to PP (PP-g-MA) or SEBS copolymer (SEBS-g-MA). The mPP blend was prepared by compounding 95% PP with 5% PP-g-MA. The matrix of hybrid composites consists of either SEBS/mPP or SEBS-g-MA/mPP. Tensile tests showed that SGF exhibits a beneficial effect for restoring the stiffness of the SEBS/mPP blend. Impact measurements on SEBS/mPP exhibited superior impact strength. However, the incorporation of SGF into SEBS/mPP and SEBS-g-MA/mPP blends reduced the impact strength considerably. SEM observations revealed that the SGF surfaces of both SGF/SEBS/mPP and SGF/SEBS-g-MA/mPP hybrids are coated with a thin layer of matrix material. This implied that the MA functional group of mPP improves the adhesion between SGF and PP, and between SGF and SEBS. The essential work of fracture (EWF) method revealed that a strong interfacial bonding between SGF and PP is detrimental to the fracture toughness of ternary SGF/SEBS/mPP and SGF/SEBS-g-MA/mPP hybrid composites. Finally, dynamic mechanical analysis showed that SGF increases the storage modulus but decreases the intensity of damping factor for the hybrids.