自增强高密度聚乙烯/超高分子量聚乙烯复合材料制备与表征

Preparations and characterizations of high density polyethylene/ultra-high molecular weight polyethylene composite

用自制模具制备出自增强高密度聚乙烯(HDPE)/超高分子量聚乙烯(UHMWPE)棒材。通过SEM观察、X射线分析、DSC分析以及力学性能测试,研究了挤出自增强HDPE/UHMWPE棒材微观结构和力学性能。研究结果表明,在HDPE和UHMWPE最佳配比为8∶2的情况下,自增强试样的拉伸强度、抗弯强度和弹性模量分别为168.5、164.8MPa和4.9GPa,比未增强试样分别提高了534.9%、261.2%和408.3%。与普通模压试样相比,自增强试样内部有大量的微纤结构和串晶互锁结构,结晶度获得提高,(110)面和(200)面的峰值均获得提高,并且熔点向高温区发生漂移。

Self-reinforced high density polyethylene（HDPE）/ultra-high molecular weight polyethylene （UHM- WPE） rods were successfully prepared using home-made mould. Microstructure characteristics and mechanical properties of self-reinforced HDPE/UHMWPE samples were studied by SEM observation, X-ray analyses, DSC analyses, tensile and bending strength measurement. It is found that when the optimal ratio of HDPE and UHMWPE was 8 ： 2, tensile strength, bending strength and elastic modules of self-reinforced samples were 168.5, 164.8MPa and 4.9GPa, and were increased by 534.9%, 261.2% and 408.3% respectively as compared with the moulded sample. A lot of microfibrillar structure and interlocking shish-kebab structure were formed in the self-reinforced sample as compared to the moulded sample, crystallinity was also increased, peak value of （110） and （200） were all improved, and melting point was shifted to high temperature region.