这项研究研究了粘胶纤维(VF)几何形状对高密度聚乙烯(HDPE)复合材料的微观结构和所得性能的影响。七种不同横截面形状的粘胶纤维,线密度,和长度被造粒,用双螺杆挤出机复合成HDPE,和注塑成型。通过研究其横截面并提取纤维并使用光学显微镜(OM)测量其长度来表征复合材料的微观结构。使用差示扫描量热法(DSC)表征复合材料的机械和热性能,拉伸试验,夏比冲击试验,和动态力学分析(DMA)。使用线性密度为1.7dtex的圆柱形纤维制备的复合材料表现出最佳的纤维分散性,最高取向,和最低的纤维纤维接触面积。圆柱形纤维线密度的降低导致分散和取向越来越差,而包含非圆柱形纤维的复合材料表现出相对较大的纤维-纤维接触面积。在加工过程中,约3至10mm的初始纤维长度减少到0.29mm至0.41mm的平均值,取决于初始几何形状。总的来说,与非圆柱形纤维相比,圆柱形纤维表现出优异的增强效果。含有线密度为1.7dtex,长度为5mm的圆柱形纤维的复合材料表现出最佳的增强效果,拉伸模量和强度分别增加了323%和141%,分别。
This study investigated the influence of viscose fibre (VF) geometry on the microstructures and resulting properties of high-density polyethylene (HDPE) composites. Seven types of viscose fibres varying in cross-section shape, linear density, and length were pelletised, compounded into HDPE with a twin-screw extruder, and injection moulded. The microstructures of the composites were characterised by investigating their cross-sections and by extracting the fibres and measuring their lengths using optical microscopy (OM). The mechanical and thermal properties of the composites were characterised using differential scanning calorimetry (DSC), tensile tests, Charpy impact tests, and dynamic mechanical analysis (DMA). The composites prepared using cylindrical fibres with a linear density of 1.7 dtex exhibited the best fibre dispersion, highest orientation, and lowest fibre-fibre contact area. The decrease in the linear density of the cylindrical fibres resulted in increasingly worse dispersion and orientation, while composites containing non-cylindrical fibres exhibited a comparably larger fibre-fibre contact area. The initial fibre length of about 3 to 10 mm decreased to the mean values of 0.29 mm to 0.41 mm during processing, depending on the initial geometry. In general, cylindrical fibres exhibited a superior reinforcing effect in comparison to non-cylindrical fibres. The composites containing cylindrical fibres with a linear density of 1.7 dtex and a length of 5 mm exhibited the best reinforcing effect with an increase in tensile modulus and strength of 323% and 141%, respectively.