期刊
POLYMER DEGRADATION AND STABILITY
卷 191, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2021.109664
关键词
Phytic acid; Self-assembly; Intumescent flame retardant; Microporous nanosheet; Polylactide
资金
- National Natural Science Foundation of China [51973178, 51673160]
The study successfully synthesized a novel flame retardant HACP-PA by assembling carbon source, acid source, and gas source into one molecular structure, which effectively improved the fire-retarding performance and crystallization performance of PLA. The addition of 5 wt% HACP-PA significantly reduced the total heat release, combustible volatile products, and total smoke production of PLA composites.
The design of flame retardants based on environment-friendly perspective is an increasingly promising strategy to meet the requirements of sustainable development. Herein, combining with the advantages of sustainability and high thermal stability of phytic acid and phosphazene, a novel mono-component intumescent flame retardant hexakis (4-aminophenoxy) cyclotriphosphazene-phytic acid with microporous nanosheet morphology (HACP-PA) is synthesized via template-free self-assembly, which assembles carbon source, acid source and gas source into one molecular structure. The fire retardancy of HACP-PA was evaluated by UL-94, limiting oxygen index (LOI), and cone calorimeter. With 5 wt% HACP-PA loading into PLA, the UL-94 V-0 rating was achieved, and the LOI value increased to 24.2%. Compared with PLA, the addition of 5 wt% HACP-PA resulted in 21.5% and 15.3% reductions in the total heat release (THR) and the peak heat release rate (pHRR) of PLA composites, respectively. Moreover, the total smoke production (TSP) also significantly decreased by 31.0%, and the combustible volatile products are remarkably reduced by the incorporation of HACP-PA. This work provides an effective approach to improve the fire-retarding performance and crystallization performance of PLA by introducing sustainable bio-based intumescent flame retardant with a unique nanosheet structure. (C) 2021 Elsevier Ltd. All rights reserved.
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