Catalytic Hydrothermal Treated Bamboo Particle Reinforced Properties of Bamboo-plastic Composites

Bamboo particle was hydrothermally treated with NaOH，Na2SiO3 and K2CO3 catalysts，and then bamboo plastic composites were prepared by hot pressing molding with PVC.Chemical composition and SEM analysis of bamboo particle and the performance test of composite materials were carried out before and after treatment.The compatibilization between treated bamboo particle and PVC matrix interface was discussed.And effect of type and concentration of the catalyst on the mechanical performance and water resistance were assessed.Results showed that the catalytic hydrothermal treatment could improve compatibility of bamboo particle and PVC matrix，and the distribution of treated bamboo particle in PVC matrix was more uniform.The type and concentration of catalyst had significant effects on the physical and mechanical properties of the composites.With concentration of the catalyst increasing from 0.5%，1%，to 2%，the mechanical strength of the composite increased at first and then decreased，the tensile strength reached the maximum value at 1% K2CO3 treatment，the bending elastic modulus reached the maximum value at 1%Na2SiO3 treatment，the static bending intensity reached the maximum value at 2%K2CO3 treatment.The 2 h water absorption，2 h and 24 h thickness expansion rate of the composites reached the minimum value at 1%Na2SiO3 treatment，and the water absorption of 24 h reached the minimum value in the 2%Na2SiO3 treatment.