Journal of Applied Polymer Science · 2020 · 17 citations · 25 references
EngineeringChemistryPhosphate Group CatalysisPolymersChemical EngineeringSalen‐based PolyphosphazenesPolymer TechnologyFire RetardancyPolymer ProcessingFire ResistancePolymer CompositesPolymer ChemistryMaterials SciencePolymer EngineeringPolymer AnalysisEpoxy Resin CompositesGas PhaseCombustion SciencePolymer ScienceFunctional MaterialsHarmful Gasses
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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