文献类型：期刊文献

英文题名：A facile and clean strategy to manufacture functional polylactic acid bead foams

作者：Liu, Wei Wu, Xian Zhang, Chun Jia, Shikui

第一作者：刘伟

通信作者：Liu, W[1]

机构：[1]Guizhou Inst Technol, Sch Mat & Energy Engn, Guiyang, Peoples R China;[2]Shaanxi Univ Technol, Sch Mat Sci & Engn, Hanzhong, Peoples R China

第一机构：贵州理工学院

通信机构：corresponding author), Guizhou Inst Technol, Sch Mat & Energy Engn, Guiyang, Peoples R China.|贵州理工学院;

年份：2023

卷号：36

外文期刊名：MATERIALS TODAY COMMUNICATIONS

收录：;EI(收录号：20233314535276);Scopus(收录号：2-s2.0-85167398292);WOS:【SCI-EXPANDED(收录号:WOS:001061331300001)】；

基金：We acknowledge the support by National Natural Science Foundation of China (52263004) , Guizhou Provincial Science and Technology Projects (QianKeHeJiChu-ZK [2022] YiBan179) , and Research Start-up Foundation for Advanced Talents of Guizhou Institute of Technology (XJGC20190657) .

语种：英文

外文关键词：PLA; Bead foam; EMI; Conductive; Stress-sensor; Bulk polymerization

摘要：Expanded poly (lactic acid) (EPLA) is a promising bio-material with ultra-low density, thermal insulation, cushioning properties, as well as the ability to be fabricated products in complex shapes. However, the time consuming of inducing double melt peaks of PLA and the complex two-steps process of steam-sintering assisted supercritical CO2 foaming is inevitable since PLA belongs crystalline polymer. To develop a facile and simple method to produce EPLA foams with functions, we used the bulk polymerization of liquid reactants to form a sintering layer between PLA beads. Meanwhile, carbon nanotubes (CNT) were synchronously introduced and distributed in the sintering layer. And a unique EPLA foam with functional sintering layer was produced using supercritical CO2 foaming technology. The reported method could prepare EPLA foam with high expansion ratio of 8.5 times and high cell density of 8.25 x 108 cell/cm3. Compared with other methods, the novel EPLA foams exhibited excellent tensile strength and compressive strength, superior electrical conductivity of 0.12 S/m, electromagnetic shielding ability of 99% in the X-band at CNT content of 2.68 wt.%, as well as sensitive and accurate stress-sensing function. It facilitates the development of novel manufacturing technology and the expansion of applications fields of EPLA foam.