Journal
COMBUSTION AND FLAME
Volume 226, Issue -, Pages 108-116Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.combustflame.2020.11.013
Keywords
Flame retardancy; Smoke toxicity; Polystyrene; Metal organic framework; Post-synthesis modification (PSM)
Categories
Funding
- National Natural Science Foundation of China [51991352, 51874266]
- Youth novation Promotion Association CAS [2019448]
- Fundamental Research Funds for the Central Universities [WK2320000043]
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The synthesis of a cobalt-based MOF-NH2 modified with PCT named PCT@MOF-NH2 significantly improves the flame retardancy and tensile strength of PS. The addition of PCT@MOF-NH2 leads to over 40% and 31% reductions in pHRR and THR values, showcasing a promising application of MOFs in enhancing flame retardation of polymer materials.
Considerable toxic gases and high temperature smoke will be generated during the combustion of polystyrene (PS), which restricts its application. Here, a cobalt-based MOF-71-NH2 (hereinafter referred to as MOF-NH2) has been synthesized and further modified with phosphonitrilic chloride trimer (PCT) by a post-synthesis modification (PSM) strategy, named as PCT@MOF-NH2, which was used to enhance the flame retardancy of PS. Desirable results were obtained as expected: the fire safety and tensile strength of PS were prominently improved after adding PCT@MOF-NH2. Compared with pure PS, there were more than 40% and 31% decreases in the value of pHRR and THR with 3.0 wt% content of PCT@MOF-NH2. From the analysis of gaseous and condensed products after combustion, the possible flame retardancy mechanism of PS nanocomposites can be attributed to the barrier effect of PCT@MOF-NH2, which provides a promising application field of MOFs to improve flame retardation of polymer materials. (C) 2020 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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