期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 336, 期 -, 页码 222-231出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2017.04.062
关键词
Flame retardant; Polymer foam; Silicone resin; Dip-coating; Silica layer
资金
- Zhejiang Provincial Natural Science Foundation [LY15E030015, LQ13E030009]
- National Natural Science Foundation of China [51203038]
- International Science and Technology Cooperation Project of Zhejiang Province [2013C24020]
- Innovation of High Level Returned Overseas Scholars (or team) in Hangzhou
In this study, a novel strategy was developed to fabricate highly flame retardant polymer foam composite materials coated by synthesized silicone resin (SiR) polymer via a facile dip-coating processing. Applying the SiR polymer coating, the mechanical property and thermal stability of SiR-coated polymer foam (PSiR) composites are greatly enhanced without significantly altering their structure and morphology. The minimum oxygen concentration to support the combustion of foam materials is greatly increased, i.e. from LO114.6% for pure foam to LOI 26-29% for the PSiR composites studied. Especially, adjusting pendant group to Si-O-Si group ratio (R/Si ratio) of SiRs produces highly flame retardant PSiR composites with low smoke toxicity. Cone calorimetry results demonstrate that 44-68% reduction in the peak heat release rate for the PSiR composites containing different R/Si ratios over pure foam is achieved by the presence of appropriate SiR coating. Digital and SEM images of post-burn chars indicate that the SiR polymer coating can be transformed into silica self-extinguishing porous layer as effective inorganic barrier effect, thus preserving the polymer foam structure from fire. Our results show that the SiR dip-coating technique is a promising strategy for producing flame retardant polymer foam composite materials with improved mechanical properties. (C) 2017 Elsevier B.V. All rights reserved.
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