Bi_(2)Te_(3)/PLA复合薄膜的制备与性能研究  

Study on preparation and properties of Bi_(2)Te_(3)/PLA composite membranes

作　　者：陈功哲 刘欣雨 李宏熠 杨闻涛 张林娜 芦宏 CHEN Gong-zhe;LIU Xin-yu;LI Hong-yi;YANG Wen-tao;ZHANG Lin-na;LU Hong(College of Materials Science and Engineering,Heilongjiang Provincial Key Laboratory of Polymeric Composite Materials,Qiqihar University,Heilongjiang Qiqihar 161006,China)

机构地区：[1]齐齐哈尔大学材料科学与工程学院,黑龙江省聚合物基复合材料重点实验室,黑龙江齐齐哈尔161006

出　　处：《齐齐哈尔大学学报（自然科学版）》2023年第3期59-62,共4页Journal of Qiqihar University(Natural Science Edition)

基　　金：黑龙江省重点研发计划指导类项目(GZ20210034);黑龙江省聚合物基复合材料重点实验室开放课题(CLKFKT2021B2);黑龙江省省属高等学校基本科研业务费青年创新人才项目(135509202);2022年黑龙江省齐齐哈尔大学大学生创新创业训练计划资助项目(S202210232025,X202210232109)。

摘　　要：采用熔体法制备了高质量的拓扑绝缘体Bi_(2)Te_(3)单晶,将研磨后的微米量级的Bi_(2)Te_(3)单晶粉末与聚乳酸(PLA)溶融共混制成Bi_(2)Te_(3)/PLA复合薄膜。为探究Bi_(2)Te_(3)单晶粉末含量差异对复合薄膜性能的影响,分别对复合薄膜的力学性能和气体透过性进行测试。结果表明,随Bi_(2)Te_(3)含量的增加Bi_(2)Te_(3)/PLA复合薄膜的拉伸强度先减小后增大,当Bi_(2)Te_(3)的含量在0.5%时,复合薄膜的拉伸强度最大达到75.00 MPa;随Bi_(2)Te_(3)含量的增加复合薄膜的气体透过系数先增大后减小,当Bi_(2)Te_(3)的含量为7.5%时,N_(2)、O_(2)和CO_(2)的气体透过系数均最大,三者的最大透过系数分别为1.017×10^(-7)、8.626×10^(-8)和1.139×10^(-7)cm^(3)·cm/cm^(2)·s·cm Hg,远超纯PLA薄膜气体透过性。研究结果为拓扑绝缘体共混改性可生物降解PLA基复合薄膜材料的研究提供思路。Topological insulator Bi_(2)Te_(3) single crystals with high quality were synthesized via melting method.Bi_(2)Te_(3)/PLA composite membranes were prepared by mixing the ground micron-scaled Bi_(2)Te_(3) powder with polylactic acid(PLA)through solution blending method.In order to explore the influence of the different content of monocrystalline Bi_(2)Te_(3) grain on the performance of the composite membranes,their mechanical properties and gas permeability were characterized.With the increase of Bi_(2)Te_(3) content,the tensile strength of the composite films declined first and then enhanced.When the content of Bi_(2)Te_(3) was 0.5%,the tensile strength reached the maximum 75.00MPa.As more Bi_(2)Te_(3) grain was added,their gas permeability increased first and then decreased.When the content of Bi_(2)Te_(3) was 7.5%,the permeability of gaseous N_(2),O_(2) and CO_(2) had the maximum coefficients 1.017×10^(-7)、8.626×10^(-8)和1.139×10^(-7) cm^(3)·cm/cm^(2)·s·cmHg at room temperature,respectively,which are far superior to those of the pure PLA films.This experiment provides ideas for the study of the biodegradable PLA based composite film materials modified by topological insulators.

关 键 词：Bi_(2)Te_(3)/PLA 复合薄膜 拓扑绝缘体 拉伸强度 气体透过性 

分 类 号：O484[理学—固体物理]