Enhancing the thermal conductivity of poly(vinylidene fluoride)membranes

[object Object]{"p":"Poly(vinylidene fluoride)(PVDF)is a kind of hydrophobic polymer with excellent thermal stability,processability and chemical resistance.Membrane condenser has been introduced as membrane process recently,and the hydrophobic membrane plays an important role in the separation of two phase and heat conduction in the membrane condenser.PVDF membranes can be used for membrane condenser due to its hydrophobicity. However,the water recovery rate of PVDF membrane in membrane condensation is not high due to the low thermal conductivity of PVDF.In order to achieve the purpose of enhancing the thermal conductivity of the PVDF membrane,the short multi-wall carbon nanotubes (SMWCNTs)with high thermal conductivity was doped in PVDF casting solutions to prepare the PVDF membrane.When the SMWCNTs concentration was 0.2%,the hydrophobicity and mechanical properties of the PVDF membrane had been significantly improved with little change in the properties of the original membrane,and the thermal conductivity of the PVDF membrane had also increased from 0.068 6W/(m· K)to 0.077 1W/(m·K).Water recovery and the flow rates in membrane condensation reached 17.39% and 0.85kg/(m~2·h),which greatly improved the efficiency of the membrane condensation process."}