聚偏二氟乙烯

Abstract(#br)PDMS-PVDF hydrophobic microporous membranes were prepared through NIPS process for the vacuum membrane distillation (VMD). The influences of PDMS/PVDF mass ratio on the morphology, crystalline structure, pore structure, hydrophobicity, mechanical characteristics and permeability of the membranes were investigated. Compared with the finger-like pore PVDF membrane, PDMS-PVDF membrane had two kinds of pores which are finger-like pore and sponge-like pore and had higher porosity, bigger mean pore size, higher hydrophobicity, stronger mechanical properties and better VMD performances.

Abstract(#br)Fouling in membrane distillation (MD) results in an increase in operation costs and deterioration in a water quality. In this work, a poly(vinylidene fluoride-co-hexafluoropropene) (PVDF-HFP) electrospun (E-PH) membrane was fabricated by hybridizing polydimethylsiloxane (PDMS) polymeric microspheres with superhydrophobicity onto the E-PH membrane via electrospinning. The resulting hybrid PDMS with E-PH (E-PDMS) membrane showed a significant enhancement in surface hydrophobicity (contact angle, CA=155.4°) and roughness (R a =1285\u003cce:hsp sp=\"0.25\"/\u003enm).

Abstract(#br)This report demonstrates the fabrication of a composite hollow fiber membrane that efficiently recovers dissolved methane (dCH 4 ) from anaerobic wastewater treatment effluents via membrane contactor (MC) process. We first fabricated highly porous hollow fiber membranes (∼85% porosity) using polyvinylidene difluoride (PVDF). Then, we coated the whole structure (bulk), or lumen side of PVDF supports with polydimethylsiloxane (PDMS), a hydrophobic polymer possessing high gas permeability.

聚偏氟乙烯( PVDF ) /聚二甲基硅氧烷( PDMS )柔性复合材料的制备与表征聚偏氟乙烯( PVDF )、聚偏氟乙烯( EpCA )静电纺丝、能量收集装置、微纤基复合材料、压电聚合物、柔性聚偏氟乙烯( PVDF ) /聚二甲基硅氧烷( PDMS )复合材料具有高压电性和力敏性，在生物力学能量收集、自供电健康监测系统、压力传感器等领域具有巨大的应用潜力。采用X射线衍射( XRD )和定制的实验装置对复合材料的结晶、压电和电学性能进行了表征。该复合材料可承受高达100 %的应变，比文献中的整体式PVDF纤维和其他PVDF基复合材料有很大的提高。杨氏模量为1.64 MPa，与人体皮肤的柔韧性紧密匹配，显示了将PVDF / PDMS复合材料集成到可穿戴设备和植入式医疗器械中的可能性。$300{\\mu}m$厚复合材料具有体积分数为14 %的PVDF纤维并产生较高的压电性，其压电电荷常数$d_{31}=19pC/N$和$d_{33}=34pC/N$，压电电压常数$g_{31}=33.9mV/N$和$g_{33}=61.2mV/N$。在10Hz的驱动下，输出电压被测量在190mVpp，这是PVDF光纤原型产生的最大输出信号。