Junaedi Harri, Baig Muneer, Dawood Abdulsattar, Albahkali Essam, Almajid Abdulhakim
Department of Mechanical Engineering, College of Engineering, King Saud University, Po BOX 800, Riyadh 11421, Saudi Arabia.
Department of Engineering Management, College of Engineering, Prince Sultan University, Po BOX 66833, Riyadh 11586, Saudi Arabia.
Polymers (Basel). 2020 Nov 29;12(12):2851. doi: 10.3390/polym12122851.
The effect of various combinations of filler materials on the performance of polypropylene (PP)-based composites was investigated. PP in particulate form was used as the matrix. Milled short carbon fiber (SCF) micro-size, graphite nano-platelet (GNP), and titanium dioxide nanoparticles (nTiO) were used as fillers. These fillers were incorporated in the polymer matrix to produce mono-filler (PP/SCF and PP/nanofiller) and hybrid composites. Hybrid composites consist of PP/10SCF/GNP, PP/10SCF/nTiO, and PP/10SCF/GNP/nTiO. The effect of the addition of SCF, GNP, and nTiO on PP-based composites was investigated by analyzing their morphological, mechanical, and physical properties. The addition of mono-filler to the PP matrix improved the mechanical properties of the composites when compared to the neat PP. The ultimate tensile strength (UTS), flexural modulus, flexural strength, and impact toughness of the hybrid composites with 15 wt % total loading of fillers, were higher than that of mono-filler composites with 15 wt % SCF (PP/15SCF). A maximum increase of 20% in the flexural modulus was observed in the hybrid composite with 10 wt % of SCF with the additional of 2.5 wt % GNP and 2.5 wt % nTiO when compared to PP/15SCF composite. The addition of 2.5 wt % nTiO to the 10 wt % SCF reinforced PP, resulted in increasing the strain at break by 15% when compared to the PP/10SCF composite. A scanning electron microscope image of the PP/10SCF composite with the addition of GNP improved the interfacial bonding between PP and SCF compared with PP/SCF alone. A decrease in the melt flow index (MFI) was observed for all compositions. However, hybrid composites showed a higher decrease in MFI.
研究了各种填料组合对聚丙烯（PP）基复合材料性能的影响。颗粒状PP用作基体。研磨短碳纤维（SCF）（微米尺寸）、石墨纳米片（GNP）和二氧化钛纳米颗粒（nTiO）用作填料。这些填料被加入到聚合物基体中以制备单填料（PP/SCF和PP/纳米填料）和混杂复合材料。混杂复合材料包括PP/10SCF/GNP、PP/10SCF/nTiO和PP/10SCF/GNP/nTiO。通过分析其形态、力学和物理性能，研究了添加SCF、GNP和nTiO对PP基复合材料的影响。与纯PP相比，向PP基体中添加单填料提高了复合材料的力学性能。填料总含量为15 wt%的混杂复合材料的极限拉伸强度（UTS）、弯曲模量、弯曲强度和冲击韧性高于填料含量为15 wt%的单填料复合材料（PP/15SCF）。与PP/15SCF复合材料相比，在含有10 wt% SCF并额外添加2.5 wt% GNP和2.5 wt% nTiO的混杂复合材料中，弯曲模量最大增加了20%。在10 wt% SCF增强的PP中添加2.5 wt% nTiO，与PP/10SCF复合材料相比，断裂应变增加了15%。添加GNP的PP/10SCF复合材料的扫描电子显微镜图像显示，与单独的PP/SCF相比，PP和SCF之间的界面结合得到了改善。所有组合物的熔体流动指数（MFI）均下降。然而，混杂复合材料的MFI下降幅度更大。
