Microstructure Regulation and Combustion Performance Optimization of PVDF/Al Composite Powder by Non-covalent Functionalized Graphenes

Abstract

Graphene prepared by non-covalent modification of sulfonated poly(ether-ether-ketone) (SPG) was combined with polyvinylidene fluoride(PVDF)/Al to improve the PVDF/Al thermal conductivity while reducing the effect of the thermal resistance at the graphene-polymer interface. The regulation rule of SPG with different contents on the energy release of fluorine-containing system was studied. When the content of SPG is 4%, the peak pressure and rise rate of SPG/PVDF/Al composite powder during ignition reach the maximum of 4 845.28 kPa and 8 683.58 kPa/s. When the content of SPG is 5%, the PVDF/Al composite powder is completely coated by SPG, and the calorific value of the material reachs the maximum of 29.094 kJ/g. Through the design and micro-control of the composite powder, the calorific value of the material can be effectively improved, but the improvement of the mass release rate still depends on the graphene content and surface modification state.

Keywords

energetic materials / PVDF/Al composites / graphene modification / energy release / combustion

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