热塑性聚氨酯/特氟龙无定形氟聚物超疏水纳米纤维膜制备及其性能

Preparation and properties of thermoplastic polyurethane/tefluororone amorphous fluoropolymer superhydrophobic nanofiber membranes

针对纳米纤维膜力学性能低和疏水性较差的问题,首先采用静电纺丝法制备热塑性聚氨酯(TPU)纳米纤维膜,然后通过浸渍特氟龙无定形氟聚物(AF)溶液获得TPU/特氟龙AF超疏水纳米纤维膜,借助扫描电子显微镜、电子万能试验仪、视频接触角张力仪等探究了浸渍质量分数、浸渍时间对纳米纤维膜疏水性及力学性能的影响。结果表明:当特氟龙AF溶液质量分数为6%时,该纳米纤维膜水接触角大于150°,油接触角小于3°,展现出超疏水性;该纳米纤维膜的力学强度不受浸渍的影响,弹性模量可达到5.09 MPa,在过滤介质、生物医学领域等具有良好的潜在应用价值。

Aiming at the problems of low mechanical properties and poor-hydrophobicity of nanofiber membrane,thermoplastic polyurethane(TPU)nanofiber membrane was prepared by electrospinning,and the TPU/tefluororone amorphous fluoropolymer(Teflon AF)superhydrophobic nanofiber membrane was obtained by impregnating in Teflon AF solution.The influence of immersion concentration and dipping time on the hydrophobicity and mechanical properties of the nanofiber membranes were analyzed by scanning electron microscope,electronic universal tester,and video contact angle tensiometer.The results show that when the mass fraction of Teflon AF is increased to 6%,the water contact angle of the nanofiber membrane reaches 150°,and the oil contact angle becomes lower than 3°,showing a superhydrophobicity.The mechanical strength of the nanofiber membrane were not affected by the impregnation,and the modulus of elasticity displayed an increase to 5.09 Pa.The nanofiber membrane implies good potential application value in filter media and biomedical fields.