Thermal degradation and intumescent flame retardation of cellulose whisker/epoxy resin composite |
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| Authors: | Kun Wu Min-Min Shen Yuan Hu Weiyi Xing Xin Wang |
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| Institution: | (1) Key Laboratory of Cellulose and Lignocellulosics Chemistry, Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou, 510650, Guangdong, China;(2) State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, 230026, Anhui, China |
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| Abstract: | The morphology, thermal degradation, and flame retardancy of epoxy (EP) composites containing microcrystalline cellulose whisker
(MCW) and microencapsulated ammonium polyphosphate (MFAPP) were investigated using optical microscopy, limiting oxygen index
(LOI), UL-94, thermogravimetry (TG), microscale combustion calorimeter, and TG-FTIR. EP/MFAPP/MCW composites can pass V-0
in UL-94 test at 6 wt% loading, and its peak heat release rate decreases when compared with EP and EP/MFAPP. The reason is
that the presence of MCW strengthens the charring capacity of EP composites in a fire. The results of TG and TG-FTIR show
that at low temperature, MFAPP stimulates the dehydration of MCW and EP, and produces gas which is helpful for the formation
of an intumescent char. Moreover, the residue at high temperature does not release any flammable gas and is a good insulation
layer on the surface of the sample, which protects the underlying material in a fire. |
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