密度对稻壳/聚氯乙烯发泡复合材料尺寸稳定性及力学性能的影响OA北大核心CSTPCD

This study investigated the effect of density variations on the performance of rice husk/polyvinyl chloride(PVC)foamed composite materials(RHPC)to address the challenges of high density and poor dimensional stability in traditional un-foamed wood plastic composites(WPCs).Three distinct densities of RHPC were fabricated using rice husk and PVC.The results revealed that as the foaming degree increases,the density and the uniformity of the cell pores decrease respectively.Notably,the coefficient of linear thermal expansion(CLTE)and water absorption expansion rate of the RHPC progressively increased from RHPC-Ⅰ to RHPC-Ⅲ,exhibiting anisotropy in dimensional changes across length,width,and thickness directions.Further analysis indicated that humidity exerted a greater effect on the dimensional stability of RHPC than the temperature.Additionally,a decrement in the bending strength,bending modulus,and creep resistance was observed from RHPC-Ⅰ to RHPC-Ⅲ.However,RHPC-Ⅱ exhibited the highest impact strength of 14.3 kJ/m2 and specific impact strength of 19.9(kJ·m-2)/(g·cm-3),which was attributed to its uniform cell structure.This research provides valuable insights for developing lightweight-high-strength WPCs and expanding its potential applications.