Yingxue Zhu

Lanzhou University of Technology

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Baoping Yang

Lanzhou University of Technology

Junhong Guo

Lanzhou University of Technology

Hailong Yu

Chinese Academy of Sciences

Bo Mu

Lanzhou University of Technology

Jinfeng Cui

Lanzhou University of Technology

Anjun Zhu

Linyi University

Li Tian

Lanzhou University of Technology

Xin Mao

Harbin University of Science and Technology

Ting Li

Shanghai Changzheng Hospital

Kangli Liu

Southeast University

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Lanzhou University of Technology

Chinese Academy of Sciences

Jiangnan University

Northwest A&F University

University of Chinese Academy of Sciences

Heilongjiang University

Beijing Institute of Technology

Zhengzhou University

University of Electronic Science and Technology of China

Sun Yat-sen University

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Cyclotriphosphazene hyperbranched P/N/Si prepared flame retardants improve mechanical properties and flame retardancy of epoxy resins

Polymers for Advanced Technologies (2022)

Hailong Yu Li Tian Ting Li Yingxue Zhu Anjun Zhu

Abstract In this study, a cyclotriphosphazene hyperbranched P/N/Si prepared flame retardant (HBPPSi) was synthesized, and the effects of different loadings of HBPPSi on the mechanical properties, thermal stability and flame retardancy of epoxy resin were investigated. The mechanical property studies showed that the addition of HBPPSi could effectively improve the strength and toughness of epoxy resin, in which the strength and toughness of 5% HBPPSi/EP composites were improved by 43% and 59%, respectively. Meanwhile, thermogravimetric analysis and combustion performance test analysis indicated that the loading of HBPPSi could significantly improve the carbon formation rate, flame retardancy, and smoke suppression performance of EP composites. 5% HBPPSi/EP composites achieved a V‐1 grade in the UL‐94 test, and the LOI value increased to 28.3%. Compared with the pure EP material, the maximum heat release rate (PHRR) and total smoke release (TSP) of the 5% HBPPSi/EP composite were reduced by 47% and 32%, respectively. In addition, the release of toxic smoke CO was also significantly reduced. More importantly, the mode of action of the effect of HBPPSi on the mechanical properties, flame retardant properties, and smoke suppression properties of EP materials was investigated.

Thermogravimetric analysis

Thermal Stability

10.1002/pat.5778

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Effect of cyclophosphazene nucleated hyperbranched polyester on flame retardancy and mechanical properties of epoxy resins

Journal of Applied Polymer Science (2022)

Hailong Yu Li Tian Yingxue Zhu Anjun Zhu Xin Mao

Abstract Hexakis(4‐hydroxyphenoxy) cyclotriphosphazene (PN‐OH) was synthesized by a nucleophilic substitution and aldehyde reduction reaction of hexachlorocyclotriphosphazene with p‐hydroxybenzaldehyde, and then cyclophosphazene nucleated hyperbranched polyesters (HBP) were prepared via a one‐pot esterification reaction of PN‐OH and dimethylolpropionic acid. The chemical structure and molecular weight distribution of HBP were confirmed by 1 H‐NMR, FTIR, and GPC. The HBP was applied to epoxy resin (EP) to improve its mechanical properties and flame retardancy. The cone calorimeter test revealed that the maximum heat release rate, total heat release and total smoke release of HBP/EP composites were reduced by 35.9%, 21.6%, and 27.3%, respectively, when 7 wt% HBP was added to the EP matrix compared with pure EP. Meanwhile, when 7 wt% HBP was added to EP composites, the limiting oxygen index value was increased from 24.6% to 27.7% and the UL‐94 test reached a V‐1 rating. More importantly, the thermal stability and mechanical properties of the HBP/EP composites were enhanced. The flame retardant mechanism analysis showed that HBP primarily acted as a flame retardant in the condensed phase. These results indicate that the HBP/EP composites have exceptional overall performance and a broad range of applications in critical fields.

Limiting oxygen index

Cone calorimeter

Thermal Stability

10.1002/app.52404

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Improvement of mechanical properties and flame retardancy of epoxy resin by phosphorylated cyclotriphosphazene hyperbranched polymeric flame retardants

Polymer (2022)

Jinfeng Cui Hailong Yu Ting Li Yingxue Zhu Anjun Zhu

10.1016/j.polymer.2022.125182

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Citations (16)