文献类型：期刊文献

英文题名：Enhancing foamability and flame-retardancy of polylactic acid bead foams through inter-beads bulk polymerization and continuous phase dispersion of LDHs

作者：Liu, Wei Wu, Xian Zhu, Jigui Chen, Xiaocheng Liu, Shan Li, Yang

第一作者：刘卫

通信作者：Li, Y[1]

机构：[1]Guizhou Inst Technol, Sch Mat & Energy Engn, Guiyang, 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：2024

外文期刊名：JOURNAL OF POLYMER SCIENCE

收录：;EI(收录号：20242916716088);Scopus(收录号：2-s2.0-85198558717);WOS:【SCI-EXPANDED(收录号:WOS:001267373700001)】；

基金：National Natural Science Foundation of China, Grant/Award Number: 52263004; Natural Science Foundation of Guizhou Province, Grant/Award Number: QianKeHeJiChu-ZK[2022]YiBan179; Innovative young scientific and technological talents training projects of Guiyang City, Grant/Award Number: ZhuKeHeTong[2024]2-12

语种：英文

外文关键词：bead foaming; EPLA; flame retardancy; LDHs

摘要：Poly (lactic acid) (PLA) bead foam has a promising application because of its renewable and naturally degradable nature. However, its processing is greatly limited by inherent shortcomings such as the complex polycrystals-inducing strategy. Herein, we developed a strategy of bulk polymerization reaction of polyvinyl acetate (PVAc) to sinter PLA beads to prepare EPLA foams accompanied by supercritical CO2 foaming technology. In order to enhance the sintering behavior and flame-retardancy of EPLA foams, two-dimensional nanolayered double hydroxides (LDHs) were introduced and dispersed in the continuous phase of the sintering layers. The formation of unique dispersion of LDHs and sintering structure of PVAc generated substantial increase in the crystallinity, melt elasticity, and sintering strength of EPLA foams, which facilitated the growth and stabilization of cells. Thus, the cell-density and expansion ratio could be increased to 8.62 x 10(6) cell/cm(3) to 9.31-fold, respectively. Moreover, the mechanical properties of the EPLA foams were improved. The tensile strength and the compression strength increased to 2.96 and 62.5 MPa. Additionally, with adding 7 wt.% LDH, the EPLA foam reached UL-94 V-0 rating with high limiting oxygen index value of 29.1% and char residue of 20.4%. This study provides a novel strategy for the preparation of flame-retardant EPLA foams with low density, three dimensional complex shapes, as well as excellent mechanical properties.