PVC/WF复合发泡材料的研究

摘要

PVC/WF composite foaming material was prepared by onestep compression molding.Effects of the WF pretreatment, the content and particle size of WF on mechanical properties.dimensional stability, density, water absorption and oil absorption of PVC/WF composite foaming material were studied.The foam structures were analysed by SEM.The results show that the tensile strength of the PVC/WF composite foaming macerial is increased.but density.water absorption and oil absorption are decreased slightly.and heat resistance showes a little lower when WF is pretreated.With the increase of WF particle size,density, water absorption rate, oil absorption rate and linear shrinkage rate are all increased,and the tensile strength increases from l.25 MPa t0 1.78 MPa, the elongation at break decreases.Density and oil absorption is significantly increased, the tensile strength is also increased, linear shrinkage is decreased, and water absorption first increases, and then decreases with the increase of content of WF in the PVC/WF composite foaming materials.Water absorption is maximum when the content of WF is 10％.%采用一步模压法制备聚氯乙烯/木粉(PVC/WF)复合发泡材料,研究木粉(WF)的预处理、用量及粒径对PVC/WF复合发泡材料力学性能、尺寸稳定性、密度、吸水性及吸油性能的影响,并通过扫描电镜(SEM)对其泡孔结构进行分析.结果表明:WF经预处理,PVC/WF复合发泡材料拉伸强度有所增强,密度和吸水率略有减小,吸油性尤明显变化,耐热性稍有降低;随着WF粒径的增加,PVC/WF复合发泡材料的密度、吸水率、吸油率和线性收缩率均增大,拉伸强度从1.25MPa增大到1.78 MPa,断裂伸长率随之减小;随着WF含量增加,PVC/WF复合发泡材料密度和吸油率均明显增加,拉伸强度也随之增大,线性收缩率减小,吸水率先增大后减小,WF质量分数10%时吸水率最大.