水环境下纱线结构对苎麻/聚乳酸复合材料老化的影响  

Effect of Yarn Structure on Aging of Ramie/Poly Lactic Acid Composites in Water

作　　者：姜宁 张儒 徐家川[1] 李迪[1] 陈朝中 JIANG Ning;ZHANG Ru;XU Jiachuan;LI Di;CHEN Chaozhong(School of Transportation and Vehicle Engineering,Shandong University of Technology,Zibo 255000,China;CRRC Academy Co.,Ltd.,Beijing 100160,China)

机构地区：[1]山东理工大学交通与车辆工程学院,山东淄博255000 [2]中车工业研究院有限公司,北京100160

出　　处：《建筑材料学报》2023年第3期275-282,共8页Journal of Building Materials

基　　金：山东省自然科学基金资助项目(ZR2020QA040);中国博士后科学基金资助项目(2021M691853)。

摘　　要：研究了单股苎麻纤维(R1)和3股苎麻纤维(R3)这2种纱线结构对苎麻/聚乳酸(PLA)复合材料吸水老化的影响.结果表明:R1/PLA复合材料中,苎麻纤维分布较为均匀;老化前期,R1/PLA与R3/PLA复合材料的吸水行为大致相同,老化后期,R3/PLA复合材料的吸水率高于R1/PLA复合材料;随着老化的进行,2种复合材料中的纤维与基体界面处出现微裂纹,基体结晶度先升后降,R3/PLA复合材料的老化速率较快,其力学性能在老化后期低于R1/PLA复合材料.R1/PLA复合材料由于纤维具有良好的分散性,其耐久性能较好,可应用于建筑工程中.Effect of yarn structure on the aging of ramie fiber reinforced poly lactic acid(PLA)composites in water was investigated.The results show that ramie fibers have better dispersibility in R1/PLA composites than R3/PLA composites.There are more water absorption of R3/PLA composites compared with R1/PLA composites after aging.For both kinds of ramie/PLA composites,the interface between fiber and matrix became worse and the crystallinity of PLA is first increased and then decreased with the prolonged aging time.The R3/PLA composites has a faster aging rate,which leads to the lower mechanical properties than R1/PLA composite in late aging stage.The R1/PLA composites has better durability due to the good dispersion of the fibers,and can be used in construction work.

关 键 词：苎麻纱线 聚乳酸 复合材料 吸水老化 力学性能 

分 类 号：TU599[建筑科学—建筑技术科学] TB332[一般工业技术—材料科学与工程]