Flame-Retardant and Smoke-Suppressed Silicone Foams with Chitosan-Based Nanocoatings

被引:65
作者
Deng, Shi-Bi [1 ]
Liao, Wang [1 ]
Yang, Jun-Chi [1 ]
Cao, Zhi-Jie [1 ]
Wang, Yu-Zhong [1 ]
机构
[1] Sichuan Univ, State Key Lab Polymer Mat Engn, Ctr Degradable & Flame Retardant Polymer Mat, Coll Chem,Natl Engn Lab Ecofriendly Polymer Mat S, Chengdu 610064, Peoples R China
基金
中国国家自然科学基金;
关键词
AMMONIUM POLYPHOSPHATE; THIN-FILM; EXTINGUISHING FLAME; POLYESTER FABRICS; NANOBRICK WALL; GAS BARRIER; LAYER; COTTON; FLAMMABILITY; NANOCOMPOSITES;
D O I
10.1021/acs.iecr.6b00532
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Flexible silicone foams (SiFs) are high-performance but flammable materials that emit dense smoke in a fire. Two type of low-cost, eco-friendly nanocoatings, i.e., chitosan (CH)/ammonium polyphosphate (APP) and CH/montmorillonite (MMT), were fabricated on SiFs through a layer-by-layer (LbL) assembly. With seven bilayers (BL) of CH/APP coatings, the limiting oxygen index (LOI) increases from 20.2% to 23.8%, the peak heat release rate (pHRR) decreases by 27.6%, and the total smoke production (TSP) decreases 42%. Further deposition of CH/APP, however, partly damaged the fire resistance. In contrast, fire hazard and smoke release of CH/MMT coated SiFs were monotonously reduced. Every 7 BL of coating leads to ca. 12% reduction of TSP. Moreover, thermogravimetric analysis (TGA) was used to follow the pyrolysis of the coated foams, and scanning electron microscopy (SEM) and energy-dispersive X-ray spectrometry (EDX) were applied to analyze the char residues systematically.
引用
收藏
页码:7239 / 7248
页数:10
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