Study On The Preparation And Properties Of Bamboo Fiber/HDPE Composites

By means of melting blend method, the bamboo powder/high density polyethylene (HDPE) composites were prepared. The surface of the bamboo powder was treated by different coupling agents in advance, meanwhile, we blended different kinds of interface modifiers into bamboo powder/HDPE composites in order to improve the interfacial bonding strength between the bamboo powder and HDPE; In the composites’preparation process, different molecular weight of ultra-high molecular weight polyethylene (UHWMPE) was added separately to enhance the impact resistance performance of bamboo powder/HDPE composites. In the end, bamboo powder/HDPE composites’ material mechanical properties, rheological properties and antibacterial properties were characterized by a series of tests. Scanning electron microscopy (SEM) was used to observe the fracture section microstructure, DSC was used to characterize bamboo powder/HDPE composites’ non isothermal crystallization kinetics.The results show that:Three kinds of coupling agent can improve the interface properties of bamboo powder/HDPE composites. Blending the interface modifier can enhance the mechanical properties of the bamboo powder/HDPE composite. The interface modifier can increase the interface adhesion between the bamboo powder and HDPE. With the content of three kinds of interface modifiers increasing respectively, the melting flow rate of bamboo powder/HDPE composites are increased. With different molecular weight of UHWMPE added into composites separately, mechanical properties of the bamboo powder/HDPE composites get improved, but the bamboo powder/HDPE composites flow performance get worse. With the content of UHWMPE increasing, the mechanical properties of the bamboo powder/HDPE composites get improved, but the bamboo powder/HDPE composites’ flow performance get worse. As for the antibacterial performance, composite sample sampling added 3wt% coated content of ZnO by diluted culture medium solution after incubation had the minimum number of bacteria, Escherichia coli growth inhibitory effect was the best, the best antibacterial effect had achieved.Using DSC studied the non-isothermal crystallization kinetics. The Jeziorny method showed that, adding bamboo powder composite/HDPE coupling agents, interface modifiers and UHWMPE, the bamboo powder/HDPE composites’crystallization rate decreased. The crystallization rate of composite added UHWMPE was the slowest. Bamboo powder /HDPE composite added bamboo powder, ZnO and other small molecules, these small molecules can play roles as heterogeneous nucleation in the crystallization process of HDPE. The crystallization rate were improved in different degree. The crystallization rate of composite adding 3% the content of coating ZnO material was the most fast. Kissinger method showed that, adding different coupling agent or interface modifiers can reduce the crystallization active energy of bamboo powder/HDPE composites, Grafted polar branch of HDPE is hampered by the large molecular chain motion and can act as nucleating agents in the crystallization process. Under these comprehensive actions, HDPE nucleating crystallization active energy decreased. The conclusions of the Mo method Obtained with the Jeziorny method’s and Kissinger method’s conclusion.