Ramie fibres were surface treated in order to enhance the interfacial interaction between ramie natural fibres and vinyl resin matrix. The fibres are exposed to three different treatment ways in this paper. The surface topography and binding force influenced by the treatments were characterized by contact angle and mechanical property. Single fibre pull-out tests combined with SEM characterization of the fracture surfaces were used to identify the interfacial strengths and to reveal the mechanisms of failure.
The rheological behavior of PA1010/POE/OMMT nanocomposites was studied by using XLY-Ⅱ rheometer. The curves of lgτω~lgγ’ω, lgηa~lgγ’ω, lgηa~1/T were obtained. The experimental results showed that PA1010/POE/OMMT nanocomposites were pseudoplastic fluid. The apparent viscosity of the blends reduced with the increase of the shearing stress.Compared with PA1010/POE blends, the addition of OMMT increased the apparent viscosity. The viscous activation energy of PA1010/POE/OMMT blends declined as the increase of shearing stress, which indicated that the PA1010/POE/OMMT blends could be processed over a wide temperature at a high shearing stress.
Flax fibres surface were treated by different treatment in order to enhance the interfacial bonding force between flax natural fibres and vinyl resin matrix. The experiment of contact angle and mechanical property were done to characterize the surface topography and bonding force and choose the best modification. What’s more, the morphology behaviour of the flax fibre surface were charact- erized using SEM.
Polymer based composites are widely used in the automobile body panels instead of the steel sheet, due to the requirement of reducing automobile weight. Natural fiber composites were proposed to be used for the car bumper beam. In this paper, the mold filling process of the car bumper beam model for VARTM process was simulated by the software of the RTM-worx. The optimization injection scheme was determined based on the simulation results of the different schemes. It was found that the multiple injection ports would reduce the filling times, and the scheme 6 was the best one for the injection. The filling times of the optimization scheme 6 was 742 s, and two vents at the position A and B would expel the bubbles at the intersectional regions of the resin. Moreover, the optimization scheme could be directly used in the practical production.
The rheological behavior of PA11/POE/OMMT nanocomposites was studied by using XLY-Ⅱ rheometer. The curves of lgτω~lg, lgηa!lg, lgηa!1/T were obtained. The experimental results showed that PA11/POE/OMMT nanocomposites were pseudoplastic fluid. The apparent viscosity of the blends reduced with the increase of the shearing stress.Compared with PA11/POE blends, the addition of OMMT increased the apparent viscosity. The viscous activation energy of PA11/POE/OMMT blends declined as the increase of shearing stress, which indicated that the PA11/POE/OMMT blends could be processed over a wide temperature at a high shearing stress.
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