竹粉/低密度聚乙烯复合材料的动态流变特性

Dynamic rheological properties of bamboo flour/low density polyethylene composites

为了解木塑复合材料的动态流变特性,从而更好地提高产品的生产效率,以及揭示界面复合机理,以竹粉/低密度聚乙烯(LDPE)复合材料为研究对象,分别考察了MAPP偶联剂、EBS润滑剂、1010抗氧剂对复合材料流变行为的影响。利用密炼机对LDPE与竹粉进行密炼混合,在此过程中根据情况添加适量的偶联剂或润滑剂或抗氧剂,得到的复合块状材料经冷却破碎后注塑成型,并对注塑试样进行了一系列的动态流变测试,包括应变扫描、温度扫描及频率扫描下的流变行为。应变扫描结果表明,与单纯的竹粉/LDPE体系相比,添加助剂的复合体系在更大的应变范围内属于线性粘弹行为;温度对复合体系的动态流变行为有显著影响,其中偶联剂的添加可有效改善竹粉与基体的相容性;频率扫描表明,添加偶联剂等助剂均有助于促进竹粉在塑料基体中的均匀分散。

In order to explore dynamic rheologieal properties of wood plastic composites, so as to better improve the production efficiency and reveals inteffacial compound mechanism, the bamboo flour/low density polyethylene （LDPE） composite material was used as researched object. The effects of the coupling agent MAPP, lubricant EBS, antioxidant 1010 on the rbeologieal behavior of composite were investigated respectively. According.to the situation, coupling agent, lubricant agent and antioxidant were added into internal mixer during the proeeas of mixing of melt LDPE and bamboo flour. The mixture was broken into fine pieces and then was used to make different testing specimens through injection molding machine. A series of dynamic rheological tests, including the strain sweep, temperature sweep and frequency sweep were done. Strain scanning results showed that compared to that without additives, the stain range of the linear visco-elastie zone of bamboo flour/LDPE composites with additives was wider; the effect of temperature on the dynamic rheological behavior of composite system was significant, especially coupling agent could effectively improve the compatibility between bamboo flour and matrix; the frequency scan indicated that additives, such as coupling agent and so on, could accelerate the dispersion of bamboo floor into polyethylene matrix.