期刊
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
卷 105, 期 -, 页码 223-234出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2017.12.001
关键词
Nanocomposites; Flame/fire retardancy; Thermal properties; Thermal analysis
资金
- National Natural Science Foundation of China [51773064]
- Natural Science Foundation of Guangdong Province [2017A030313303]
- Special Funds for the Cultivation of Guangdong College Students' Scientific and Technological Innovation [pdjh2017a0028]
Poor efficiency is one of the biggest challenges for halogen-free flame retardant polymer. Catalyzing the carbonization of polymer itself during combustion is proposed to be a promising way to address this issue. In this work, a novel macromolecular charring agent (MCA) decorated by zirconium phosphate nanosheet named ZrP-d-MCA was synthesized and characterized. Subsequently, it was combined with ammonium polyphosphate (APP) to reduce the flammability of polypropylene (PP). When the contents of ZrP-d-MCA and APP were 5 wt% and 15 wt%, respectively, PP/Zr-d-MCA/APP could reach a limiting oxygen index of 32.5% and achieve UL-94 V-0 rating. Moreover, the bench-scale combustion performance determined by the cone calorimeter was significantly improved. The flame-retardant mechanism of ZrP-d-MCA/APP was revealed: during combustion, ZrP nanosheet could efficiently catalyze the charring reactions of MCA to form closed micro-nano char-cages, in which the degradation products of PP would be trapped and catalyzed into thermostable graphitization char. (C) 2017 Elsevier Ltd. All rights reserved.
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