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本研究主要对高填充木塑复合材料(WPCs)的流变性能和力学性能进行了评价。为了提高木纤维与聚丙烯/聚乙烯(PP/PE)共混物的界面结合,采用马来酸酐(MAH)对PP/PE共混物进行接枝,然后用60、wt.%木纤维和接枝改性的PP/PE共混物通过挤出工艺制备木塑复合材料。利用动态测试方法研究了木塑复合材料的流变性能。根据应变扫描确定了复合材料的线性粘弹性区域,结果表明在低应变区域f<0.1%1储能模量与应变无关。频率扫描结果显示,所有复合材料均表现出剪切变稀行为,经过MAH改性的复合材料的储能模量和复数粘度与未改性的相比显著下降。参照相关标准对复合材料的弯曲性能和冲击强度进行了测定。材料的弯曲强度和冲击强度都得到了显著的提高,并且在MAH含量1.0wt.%时达到最大值,而弯曲模量开始呈下降趋势,之后随着MAH的增加也开始上升。力学性能的提高表明酸酐基团的引入提高了木纤维与PP/PE共混物的界面结合。图6参15。
In this study, the rheological and mechanical properties of WPCs were evaluated. In order to improve the interfacial bonding between wood fiber and polypropylene / polyethylene (PP / PE) blends, PP / PE blends were grafted with maleic anhydride (MAH) and then blended with 60, wt. Graft modified PP / PE blends prepared by extrusion process of wood-plastic composites. The dynamic testing method was used to study the rheological properties of wood-plastic composites. The linear viscoelastic region of the composite was determined by strain sweep. The results show that the storage modulus is independent of strain at f <0.1% at low strain. The results of frequency scanning showed that all the composites exhibited shear thinning behaviors. The storage modulus and complex viscosity of MAH-modified composites decreased significantly compared with unmodified ones. The bending properties and impact strength of the composites were measured with reference to relevant standards. The flexural strength and impact strength of the composites have been significantly improved, and reached the maximum at 1.0wt.% MAH, while the flexural modulus began to decline, and then began to increase with the increase of MAH. The improvement of mechanical properties indicates that the introduction of anhydride groups increases the interfacial bonding between wood fibers and PP / PE blends. Figure 6 Reference 15.