针刺加固频率对黄麻纤维/聚乳酸短纤复合板性能的影响  

Influence of needling reinforcement frequency on properties of jute/polylactic acid fiber composite sheets

作　　者：孙明涛 陈成玉 闫伟霞 曹珊珊 韩克清[1] SUN Mingtao;CHEN Chengyu;YAN Weixia;CAO Shanshan;HAN Keqing(College of Materials Science and Engineering,Donghua University,Shanghai201620,China;Analysis and Testing Center,Donghua University,Shanghai201620,China)

机构地区：[1]东华大学材料科学与工程学院,上海201620 [2]东华大学分析测试中心,上海201620

出　　处：《纺织学报》2023年第9期91-98,共8页Journal of Textile Research

基　　金：国家重点研发计划项目(2017YFB0309300)。

摘　　要：为使生物质可降解复合材料在汽车内饰领域替代传统石油基材料,以黄麻纤维(JF)、聚乳酸(PLA)短纤为原料,通过纤网模压成型法制备了黄麻纤维/聚乳酸短纤(JF/PLA)复合板,着重探讨了针刺过程中不同针刺频率对复合板结构及性能的影响。结果表明,当针刺频率为300次/min时,复合板的力学性能达到最大,其纵向拉伸强度、弯曲强度及缺口冲击强度分别为14.54 MPa、33.02 MPa、9.54 kJ/m^(2)。进一步增加针刺频率,纤网中部分黄麻纤维会发生断裂,造成复合板力学性能出现下降。另外,针刺频率的提高使得复合板吸水率与生物降解速率下降,同时复合板的阻燃效果得到改善,有利于JF/PLA复合板在汽车内饰领域的推广应用。Objective In order to use biomass degradable composite materials to replace conventional petroleum-based materials in the field of automotive interiors,jute fiber reinforced polylactic acid(JF/PLA)composite sheets were prepared by web molding technique,where needling reinforcement was believed beneficial to the infiltration and encapsulation of PLA matrix on jute fiber during the web forming process.The needling frequency has a certain influence on the structure and properties of the final obtained JF/PLA composite sheets,which has rarely been reported.This paper explores the influence of needling frequency on the structure and performance of composite sheets.Method PLA short fiber of 60%mass fraction and jute fiber of 40%mass fraction were used for preparing JF/PLA composite sheets by web forming technique,where the needling frequency was selected at 280,300 and 320 times/min.The volume densities of the JF/PLA composite sheets were 2.50,2.81,and 2.92 g/cm 3 corresponding to the 280,300,and 320 times/min needling frequencies,respectively.Scanning electron microscope,universal testing machine,impact testing machine,water-absorbency tests,combustibility tests and biodegradability tests were used for exploring the influence of the needling reinforcement frequency on properties of PLA/JF composite sheets.Results The mechanical properties of JF/PLA composite sheets increased first and then decreased with the increase of needling frequency.When the needling frequency was 300 times/min,the mechanical properties of the JF/PLA composite sheets were optimal,and the vertical tensile strength,the flexural strength and notched impact strength were 14.54 MPa,33.02 MPa and 9.54 kJ/m 2,respectively.However,the high needling frequency seemed to cause decline in the mechanical properties of JF/PLA composite sheets due to the fracture of part of the jute fibers.The water-absorbency of JF/PLA composite sheets gradually decreased with the increase of needling frequency(Fig.6),because the increase of needling frequency caused the furt

关 键 词：纤网模压成型 黄麻纤维/聚乳酸短纤复合材料 针刺频率 力学性能 生物降解性能 汽车内饰复合材料 

分 类 号：TB332[一般工业技术—材料科学与工程]