文献类型：期刊文献

英文题名：Surface grafting of sepiolite with a phosphaphenanthrene derivative and its flame-retardant mechanism on PLA nanocomposites

作者：Jiang, Peng[1] Zhang, Sheng[2] Bourbigot, Serge[3] Chen, Zhilin[1] Duquesne, Sophie[3] Casetta, Mathilde[3]

第一作者：姜鹏

通信作者：Jiang, P[1];Zhang, S[2]|[a000570cfea21705df7ed]姜鹏;

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China;[2]Beijing Univ Chem Technol, Minist Educ, Key Lab Carbon Fiber & Funct Polymer, Beiijng 100029, Peoples R China;[3]ENSCL ISP UMET, F-59652 Villeneuve Dascq, France

年份：2019

卷号：165

起止页码：68-79

外文期刊名：POLYMER DEGRADATION AND STABILITY

收录：;EI(收录号：20191906894612);Scopus(收录号：2-s2.0-85065135358);WOS:【SCI-EXPANDED(收录号:WOS:000473374500009)】；

基金：The authors wish to thank the National Forestry public welfare industry research project (CAFYBB2017MA014) for their financial contributions.

语种：英文

外文关键词：Sepiolite; Poly(lactic acid) nanocomposite; Thermal analysis; Flame retardancy

摘要：Poly (lactic acid) (PLA), which is one of the most widely used biodegradable polymers, needs to be rendered flame retardant for use in textiles, automobiles, and electronics. Few environmentally friendly flame-retardant solutions exist for PLA mainly because of the nature of the additives (large amount introduced or the use of non-biodegradable organic additives). In this regard, natural sepiolite (SEP) is a known flame retardant for PLA mainly due to high loading (at least 25 wt %). In this study, SEP was surface-modified by grafting with 9, 10-dihydro-9-oxy-10-phosphaphenanthrene-10-oxide (DOPO) via the condensation between amino groups and salicylaldehyde with a grafting ratio of approximately 12.8%. DOPO-modified sepiolite (SEP-DOPO) was then introduced to PLA to improve the fire performance of the nanocomposites. PLA containing 10 wt % SEP-DOPO showed improved dispersion compared to a mixture of 10 wt % DOPO/SEP in a PLA matrix. Moreover, the peak of the heat release rate (pHRR) measured using mass loss calorimeter reduced by 40.7% for a loading of 10 wt % SEP-DOPO. The synergetic effect between DOPO and sepiolite was evaluated. The TGA-FTIR result showed that un-grafted DOPO was degraded before the polymer matrix, which cannot enhance the flame retardancy of the PIA composite. The solid-state nuclear magnetic resonance (NMR) spectra of the charred residues confirmed that the formed Si-O-Si, H3PO3, and P-N crosslinking structure enhanced char formation in the condensed phase. (C) 2019 Elsevier Ltd. All rights reserved.