聚丙烯腈/山梨醇复合纳米纤维膜的制备与除湿性能

Preparation and Moisture Regulating Properties of Polyacrylonitrile/Sorbitol Composite Nanofiber Membrane

溶液除湿空调系统因可实现节能又高效的室内除湿,近年来受到很多的关注。填料是溶液除湿空调系统中的核心部件之一,其比表面积、润湿性等特性是影响除湿性能的关键因素。为了开发应用于溶液除湿空调系统的高性能填料,采用静电纺丝技术制备了聚丙烯腈(PAN)/山梨醇(SBT)复合纳米纤维膜;利用扫描电镜、比表面积测试仪及水接触角测试仪等测试手段对复合纳米纤维膜的微观形貌与结构及浸润性进行了表征;使用高低温试验箱对除湿性能进行测试。结果表明:当PAN和SBT的质量比为13∶12且浸渍氯化锂(LiCl)质量分数为20%时,复合纳米纤维膜的除湿性能最优,达到2.97 g/g。经过5次循环测试发现,该复合纳米纤维膜具有良好的循环稳定性。

Liquid desiccant air-conditioning system has received increasing attention in recent years because it can achieve energy-saving and efficient indoor dehumidification.The packing material is one of the core components of the liquid desiccant air-conditioning system,and its specific surface area,wettability and other characteristics are the key factors affecting the dehumidification performance.In order to develop packing material of high performance for liquid desiccant air conditioning system,this paper prepared polyacrylonitrile(PAN)/sorbitol(SBT)composite nanofiber membranes by electrospinning.The microscopic morphology and structure and wettability of the composite nanofiber membranes were characterized by scanning electron microscopy,specific surface area and water contact angle.The dehumidification performance was tested by high and low temperature test box.The results show that the dehumidification performance of the composite nanofiber membrane is the best(2.97 g/g),when the mass ratio of PAN to SBT is 13∶12 and the mass fraction of impregnated lithium chloride(LiCl)is 20%.After 5 cycles of test,it is found that PAN/sorbitol nanofiber membrane exhibits good cycle stability.