Synthesis of a Reactive Template-Induced Core–Shell PZS@ZIF-67 Composite Microspheres and Its Application in Epoxy Composites
| Autor: | Xueli Li, Weiwei Yang, Zheng Dongsen, Fang Zhuqing, Jiping Liu, Nianhua Li, Wang Yinjie, Meizhuang Qiao, Fang Ruan, Song Kunpeng |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
polyphosphazenes
Materials science flame retardant Polymers and Plastics Thermal decomposition Composite number Organic chemistry General Chemistry Epoxy engineering.material Article epoxy resin ZIF-67 QD241-441 Coating Nanocrystal visual_art Phase (matter) engineering visual_art.visual_art_medium mechanism of flame retardant Polyphosphazene Composite material Fire retardant |
| Zdroj: | Polymers, Vol 13, Iss 2646, p 2646 (2021) Polymers Volume 13 Issue 16 |
| ISSN: | 2073-4360 |
| Popis: | Developing superior properties of epoxy resin composites with high fire resistance, light smoke, and low toxicity has been the focus of the research in the flame-retardant field. In particular, it is essential to decrease the emissions of toxic gases and smoke particles generated during the thermal decomposition of epoxy resin (EP) to satisfy the industrial requirements for environmental protection and safety. Consequently, the PZS@ZIF-67 composite was designed and synthesized by employing the hydroxyl group-containing polyphosphazene (poly(cyclotriphosphazene-co-4,4′-dihydroxydiphenylsulfone), PZS) as both the interfacial compatibility and an in situ template and the ZIF-67 nanocrystal as a nanoscale coating and flame-retardant cooperative. ZIF-67 nanocrystal with multidimensional nanostructures was uniformly wrapped on the surface of PZS microspheres. Subsequently, the acquired PZS@ZIF-67 composite was incorporated into the epoxy resin to prepare composite samples for the study of their fire safety, toxicity suppression, and mechanical performance. Herein, the EP/5% PZS@ZIF-67 passed the V-0 rating in a UL-94 test with a 31.9% limit oxygen index value. More precisely, it is endowed with a decline of 51.08%, 28.26%, and 37.87% of the peak heat release rate, the total heat release, and the total smoke production, respectively. In addition, the unique structure of PZS@ZIF-67 microsphere presented a slight impact on the mechanical properties of EP composites at low loading. The PZS@ZIF-67 possible flame-retardant mechanism was speculated based on the analysis of the condensed phase and the gas phase of EP composites. |
| Databáze: | OpenAIRE |
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