WPC-LVL共挤出复合材料的抗弯性能  

Flexural Performance of Composite Manufactured by Wood Plastic Composites Co-extruded with Laminated Veneer Lumber

作　　者：王海刚[1] 傅海涛[1] 王清文 顿梦媛 刘天[1] 陈朝苒 WANG Haigang;FU Haitao;WANG Qingwen;DUN Mengyuan;LIU Tian;CHEN Zhaoran(Key Laboratory of Biomass Materials Science and Technology of Ministry of Education,Northeast Forestry University,Harbin 150040,China;College of Materials and Energy,South China Agricultural University,Guangzhou 510642,China)

机构地区：[1]东北林业大学生物质材料科学与技术教育部重点实验室,黑龙江哈尔滨150040 [2]华南农业大学材料与能源学院,广东广州510642

出　　处：《建筑材料学报》2018年第4期695-700,共6页Journal of Building Materials

基　　金：中央高校基本科研业务费专项资金项目(2572017PZ01);国家自然科学基金资助项目(31500482)

摘　　要：通过共挤出技术制备具有核壳结构的共挤出复合材料(CTC).其壳层为木粉/高密度聚乙烯(HDPE)基木塑复合材料(WPC),核层为杨木单板层积材(LVL).通过三点弯曲试验获得CTC和LVL试件的弯曲性能及破坏模式,并进一步研究水煮-冷冻-干燥环境对两者弯曲性能的影响.结果表明:CTC试件相对于LVL试件,其弯曲强度、弹性模量和抗弯刚度分别下降6.6%,12.7%和16.0%;但由于壳层WPC阻止了核层破坏时裂纹的产生和发展,使CTC试件的失效时间延长了44.1%;水煮-冷冻-干燥处理后,CTC试件的弯曲性能下降幅度明显小于LVL试件,这证明壳层WPC对核层LVL起到了很好的保护作用,WPC和LVL通过共挤出技术可达到很好的组合效应.Co-extrusion composites(CTC)with core-shell structure were prepared by co-extrusion technology with wood/high density polyethylene based(HDPE)composites(WPC)as shell layer and poplar laminated veneer lumber(LVL)as core layer.Both of the CTC and LVL were treated with boiled-frozen-dry environment at one cycle,and the flexural performance and failure mode of CTC and LVL were investigated by three-point bending test.The results show that the bending strength,bending modulus and bending stiffness of CTC decrease by 6.6%,12.7%and 16.0%,respectively,compared with LVL at room temperature.When the core is broken,the failure time increased by 44.1%,because the shell of WPC preventes the crack generation and development.The boiled-frozen-dry treated results indicate that the CTC had better environmental resistance on flexural performance,resulting from the protection of the shell layer.It can be concluded that WPC and LVL have achieved a considerable combination effect by co-extrusion.

关 键 词：共挤出复合材料 核壳结构 弯曲性能 破坏模式 壳层保护 

分 类 号：TB332[一般工业技术—材料科学与工程]