Research On The Rheological Properties Of The Bamboo Powder Reinforced HDPE Composites

Bamboo plastic composites(BPC) are some kind of filled multiphase composites. The change of their internal structure is so complicated during the preparation of these composites. Both of polymer chain structures and the fillers will affect internal structure of composites. In this thesis, the influences of filler concentration、coupling agent concentration、lubricant concentration and the temperature on the composites’ dynamic rheological behavior were studied. The composites’ sensibilities to the "Payne effect" and "pseudo solid-like" behavior were discussed in order to explore the development and the destroy of the composites’ inner structure.The results show that the oxidative cross-linking will occur at high temperatures easily, which will affect the BPC’s Dynamic rheological behavior. Using of the antioxidant will improve the thermal stability of HDPE, which will reduce the influence on the BPC’s Dynamic rheological behavior by the HDPE’s oxidative cross-linking.Through changing the concentration of the bamboo,the influence of the filler concentration in the BPC composite’s "Payne effect" and "pseudo solid-like" behavior were studied. The results revealed that the composite’s sensibility to the "Payne effect" increased with increase of the bamboo concentration, and it’s "pseudo solid-like" behavior presented much more easily. And the low-loaded composite has wider linear scope than the high-loaded composite. The viscoelastic moduli and η*decrease during the temperature increase. The temperature decrease the composite’ sensibility to "Payne effect", but has no effect on the sensibility to the "pseudo solid-like" behavior. The BPC with30%bamboo powder content has the biggest tensile strength and flexural strength.Studies on the influence of the coupling agent concentration in the BPC’s "Payne effect" and "pseudo solid-like" behavior reveal that the coupling agent effects the composite’s inner structure somehow. Though the change of the coupling concentration has no effect on the "Payne effect", it decreases the sensibility to the "pseudo solid-like" behavior. Meanwhile, the viscoelastic moduli and η*decrease The BPC with2%coupling agent content has the biggest flexural strength,and has the biggest tensile strength with4%.The influence of the lubricant concentration in the BFRP composite’s "Payne effect" and "pseudo solid-like" behavior is studied.It reveals that the concentration of the lubricant has no effect in the composite’s sensibility to the "Payne effect", but decreases the sensibility to the "pseudo solid-like" behavior. Lubricant content can not continue to improve the dynamic rheological modulus when the content of lubricant is bigger than1%. Meanwhile, the BPC with2%lubricant content has the highest tensile strength and flexural strength.