Cross-linked Salen-based polyphosphazenes (Salen-PZNs) enhancing the fire resistance of epoxy resin composites |
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| Authors: | Yabin Zhang Jinfeng Cui Lurong Wang Hailong Yu Fuchong Li Baoping Yang Junhong Guo Bo Mu Li Tian |
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| Affiliation: | 1. School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, China;2. PetroChina Lanzhou Chemical Research Center, China National Petroleum Corporation, Lanzhou, China |
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| Abstract: | In this work, two cross-linked Salen-based polyphosphazenes (Salen-PZNs: Salen-PZN-1 microspheres and layered Salen-PZN-2), which contains Salen-Schiff base and phosphazene components, were synthesized. The results showed that the peak heat release rate and total smoke production of 3% Salen-PZN-1/epoxy resin (EP) (3 wt% addition) were reduced by 23.8% and 87.3%, respectively. Meanwhile, after introducing the layered Salen-PZN-2 into EP, efficient flame resistance was obtained. The results of thermogravimetric analysis/infrared spectrometry proved that the harmful gasses of 5% Salen-PZN-1/EP composites were reduced during the combustion. The possible flame retardancy mechanism was considered to be the synergy of phosphate group catalysis, release of nitrogen-containing noncombustible gasses and gas phase quenching. Therefore, this work provides a method for preparing polymers with highly efficient flame-retardant properties. |
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| Keywords: | applications flame retardance polycondensation resins |
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