Synergistic effect of amino silane functional montmorillonite on intumescent flame-retarded SEBS and its mechanism
Synergistic effect of amino silane functional montmorillonite on intumescent flame-retarded SEBS and its mechanism
复制标题
氨基硅烷功能蒙脱土对膨胀阻燃SEBS的协同作用及其机理
DOI：
10.1002/app.44953
复制
发表时间：
2017-06-20
影响因子：
3
通讯作者：
Li, Ying
中科院分区：
文献类型：
--
作者：
Li, Xiaoyan;Tang, Shawei;Li, Ying
采用季鏻盐插层蒙脱土，通过烷基氨基硅烷偶联接枝改性蒙脱土，制备了功能化改性蒙脱土。研究了氟-有机蒙脱土（F-OMMT）对膨胀型阻燃聚苯乙烯-b-（乙烯-丁烯）-b-苯乙烯（SEBS）复合材料（SEBS/IFR）阻燃性能的协同效应及其成炭机理。当在SEBS/IFR复合材料中引入2wt%的F-OMMT时，复合材料的极限氧指数（LOI）值从24.9%提高到26.9%，并且根据微型燃烧量热仪（MCC）测试的峰值热释放速率显著降低。外部炭表明F-OMMT产生具有稳定石墨结构的致密且完整的纳米颗粒。同时，F-OMMT有助于在炭层中形成含有大量P、O、N和Si的交联网络。沿着IFR，粘土上的氨基官能团在气相中释放出难燃的氨，增强的发泡效果可以克服SEBS的高粘度阻力，从而制备出更多的具有增强粘土片晶的膨胀型涂料。此外，由于良好的分散效果，SEBS/IFR/F-OMMT复合材料的拉伸性能明显提高。F-OMMT可以作为SEBS/IFR复合材料的一种有效、环保的添加剂。(C)2017 Wiley Periodicals，Inc.
A functional modified montmorillonite (F-OMMT) was prepared by intercalating pristine montmorillonite using phosphonium salt and subsequent grafting through alkyl amino silane coupling. The synergistic effect of F-OMMT on the flame retardancy and char-forming mechanism of intumescent flame-retarded polystyrene-b-(ethylene-co-butylene)-b-styrene (SEBS) composite (SEBS/IFR) was investigated. When 2 wt % F-OMMT was introduced to the SEBS/IFR composite, the limited oxygen index (LOI) value of the composite increased from 24.9% to 26.9%, and the peak heat release rate significantly reduced according to microscale combustion calorimeter (MCC) test. The outer char demonstrated that F-OMMT produced dense and intact nanoparticles with a stabilised graphite structure. Meanwhile, F-OMMT helped form a crosslinking network containing large amounts of P, O, N, and Si in the char layer. Along with IFR, the amino functional group on the clay released nonflammable ammonia in the gaseous phase, the enhanced blowing effect can overcome the high-viscosity resistance of SEBS, more intumescent coating with strengthened clay platelets was then produced. In addition, the tensile properties of SEBS/IFR/F-OMMT composite increased evidently for the good dispersion effect. F-OMMT can serve as an effective and environmentally friendly additive for SEBS/IFR composite. (C) 2017 Wiley Periodicals, Inc.