期刊
POLYMER DEGRADATION AND STABILITY
卷 173, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2020.109080
关键词
Flame-retardant polyamide 6; Polydiphenylsiloxane (PDPS); Ethylene glycol (EG); Inherent flame retardancy; Anti-dripping
资金
- National Key Research and Development Program of China, China [2016YFB0302700, 2017YFB0309001]
- Shanghai Natural Science Foundation, China [18ZR1400400, 18ZR1400500]
- Intelligent Manufacturing Program of China, China
- Fundamental Research Funds for the Central Universities, China [CUSF-DH-D-2018037]
An inherent flame-retardant PA6 (FR-PA6) containing polydiphenylsiloxane (PDPS) was synthesized under the action of ethylene glycol (EG) via a facile 2-step bulk polymerization. Inspiringly, EG acted not only as a 'chain-linker' to connect PA6 oligomer with PDPS moiety but also as a charring agent to increase the charring capacity of FR-PA6 after combustion. The prepared FR-PA6 reached 28.3% of limiting oxygen index (LOI), and passed the V-0 level of UL94 test with suppressed melt-dripping. After investigating the char residues and pyrolysis volatiles of FR-PA6 after combustion, the formation of silicon-rich protective layer was proved to be the essential factor to increase the flame retardancy of FR-PA6 via reducing the diffusion of pyrolysis volatiles, restricting the heat transfer and mass loss as well as preventing polymer melts from dripping. This work thus makes a worthwhile contribution to the development of FR-PA6 by offering a novel route that is easily accessible to industrial fabrication. (C) 2020 Elsevier Ltd. All rights reserved.
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