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Open AccessArticle

Investigation of the Structure-Property Effect of Phosphorus-Containing Polysulfone on Decomposition and Flame Retardant Epoxy Resin Composites

by Wei Zhao 1,*, Yongxiang Li 1,2, Qiushi Li 1,2, Yiliang Wang 3 and Gong Wang 1,2,*
1
CAS Key Laboratory of Space Manufacturing Technology, Technology and Engineering Center for Space Utilization, Chinese Academy of Sciences, Beijing 100094, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
Department of Chemistry and Center for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, China
*
Authors to whom correspondence should be addressed.
Polymers 2019, 11(2), 380; https://doi.org/10.3390/polym11020380
Received: 23 January 2019 / Revised: 11 February 2019 / Accepted: 19 February 2019 / Published: 21 February 2019
(This article belongs to the Special Issue Flame Retardancy of Polymeric Materials)
The flame retardant modification of epoxy (EP) is of great signification for aerospace, automotive, marine, and energy industries. In this study, a series of EP composites containing different variations of phosphorus-containing polysulfone (with a phosphorus content of approximately 1.25 wt %) were obtained. The obtained EP/polysulfone composites had a high glass transition temperature (Tg) and high flame retardancy. The influence of phosphorus-containing compounds (ArPN2, ArPO2, ArOPN2 and ArOPO2) on the thermal properties and flame retardancy of EP/polysulfone composites was investigated by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), a UL-94 vertical burning test, and cone calorimeter tests. The phosphorus-containing polysulfone enhanced the thermal stability of EP. The more stable porous char layer, less flammable gases, and a lower apparent activation energy at a high degree of conversion demonstrated the high gas inhibition effect of phosphorus-containing compounds. Moreover, the gas inhibition effect of polysulfone with a P–C bond was more efficient than the polysulfone with a P–O–C bond. The potential for optimizing flame retardancy while maintaining a high Tg is highlighted in this study. The flame-retardant EP/polysulfone composites with high thermal stability broaden the application field of epoxy. View Full-Text
Keywords: polysulfone; epoxy resin; flame retardant; structure-property effect; kinetics; glass transition temperature polysulfone; epoxy resin; flame retardant; structure-property effect; kinetics; glass transition temperature
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MDPI and ACS Style

Zhao, W.; Li, Y.; Li, Q.; Wang, Y.; Wang, G. Investigation of the Structure-Property Effect of Phosphorus-Containing Polysulfone on Decomposition and Flame Retardant Epoxy Resin Composites. Polymers 2019, 11, 380.

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