文献类型：期刊文献

英文题名：Preparation of a biobased core-shell flame retardant and its application in polylactic acid

作者：Wang, Xiaolong[1];Gong, Weiguang[2];Meng, Xin[1];Li, Chenyang[1];Gao, Jin[1]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, Dept Prod Engn, Shanghai, Peoples R China;[2]East China Univ Sci & Technol, Res & Dev Ctr Sports Mat, Shanghai 200237, Peoples R China

年份：2022

卷号：139

期号：31

外文期刊名：JOURNAL OF APPLIED POLYMER SCIENCE

收录：;EI(收录号：20222412216862);WOS:【SCI-EXPANDED(收录号:WOS:000809335500001)】；

基金：National Natural Science Funds of China, Grant/Award Number: 21576086; Ningbo Public Welfare Science and Technology Project, Grant/Award Number: 2021S09

语种：英文

外文关键词：chitosan; core-shell; flame retardant; halloysite; polylactic acid

摘要：Biobased flame retardant (FR) has attracted great interest owing to its green and degradable properties similar to polylactic acid (PLA). In this work, with ammonium polyphosphate (APP) as the core, chitosan (CS) and halloysite (HNT) as the shell, a biobased FR (APP@CS@HNT) with a core-shell structure was prepared through the self-assembly method. The flame retardancy of PLA composites has been improved with the addition of the FR (APP@CS@HNT). With the loading of 17 wt% APP@CS@HNT, the PLA composite shows a high limiting oxygen index value (29.4%) and achieves vertical burning (UL-94) test V0 rating. Compared with pure PLA, the cone calorimetry test indicates that the peak heat release rate (PHRR) and total heat release decrease from 299.88 to 152.29 kW/m(2) and from 102.0 to 71.2 MJ/m(2), respectively. The addition of APP@CS@HNT can also improve the smoke suppression performance of PLA composites. Such enhanced flame retardancy is mainly attributed to APP@CS@HNT prompting the PLA matrix to produce more continuous and denser carbon layers at a lower temperature to form physical barriers.