聚乙烯基木塑复合材料的吸水性及其影响  

Water Absorption of Polyethylene/Wood Flour Composite and Its Effects on Mechanical Properties of the Composite

作　　者：梁梦杰[1] 吕群[1] 蔡培鑫[1] 曹志海[1] 

机构地区：[1]杭州师范大学材料与化学化工学院,浙江杭州310036

出　　处：《塑料》2012年第6期46-49,59,共5页Plastics

摘　　要：将配方中部分至全部的聚乙烯(PE)用马来酸酐接枝聚乙烯(MAPE)替代,用挤出成型法制备聚乙烯基木塑复合材料(WPC),研究WPC的浸水时间、MAPE含量对WPC吸水率的影响,以及吸水率对WPC的弯曲强度、冲击强度和吸水膨胀的影响。结果表明:随着WPC浸水时间增加,初期WPC的吸水速率较快,随后吸水速率逐渐减慢,浸水时间足够长后,WPC的吸水率达到饱和而不再增加;随着WPC中MAPE含量增加,WPC的吸水率降低,吸水膨胀率减小;WPC的弯曲强度、冲击强度和WPC材料尺寸与其吸水率有直接关系,随着WPC吸水率增加,WPC的弯曲强度和冲击强度趋向于降低,WPC吸水膨胀率增加,当WPC吸水达到饱和吸水率后,WPC的弯曲强度、冲击强度和材料尺寸均趋于稳定。Polyethylene （PE）/maleated polyethylene/ wood flour composite （WPC）was prepared by extrusion. The influences of the immersion time and the content of maleated polyethylene （MAPE） on the water absorption of the composite were studied. Furthermore,the dependence of the mechanical properties of WPC including the flexural strength, impact strength and expansion on the water absorption was thoroughly investigated. A fast absorption rate was observed at the initial stage of immersion. With prolonging the immersion time,the absorption rate gradually reduced, and finally reached an equilibrium. Both the water absorption extent and expansion of the water-absorbed of WPC were reduced with increasing the content of maleated polyethylene in WPC. The flexural strength, impact strength and dimension stability of WPC were influenced by the water absorption extent. The flexural strength and impact strength of WPC reduced with increasing the water absorption extent. And the expansion of the water-absorbed WPC increased. The mechanical properties remained constant when the WPC was saturated with water.

关 键 词：聚乙烯 马来酸酐接枝聚乙烯 木塑复合材料 吸水率 尺寸稳定性 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]