Preparation and Characterization of Hydrophilic Ultrafiltration Membrane with PVDF and PAA Blends
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Hydrophilic Polyvinylidene fluoride (PVDF) flat ultrafiltration membranes were prepared by wet-spinning method. The influence of blending ratio ( the mass ratio of PVDF and PAA), polymer concentration on preparation of blending modified hydrophilic PVDF ultrafiltration membranes were investigated, the technical parameters of preparation of hydrophilic PVDF membranes were determined, and hydrophilic PVDF membranes were prepared. Then, hydrophilic PVDF membranes were characterized in terms of IR spectra, contact angle, scanning electron microscopy images, pure water flux and rejection. The results showed that hydrophilic ultrafiltration membrane could be prepared with PAA and PVDF blends, the hydrophilicity improved greatly, and it was better than traditional PVDF membrane.Keywords:
Polyvinylidene fluoride
Ultrafiltration (renal)
전기방사기법을 통해 형성된 전기방사 필름은 단위부피당 높은 비표면적을 갖는 구조적인 특징과 더불어, 기계적, 전기적, 광학적 특성을 향상시키기 위한 금속 및 세라믹 나노입자의 첨가가 용이하기 때문에 액체 및 기체 필터, 약물전달, 전지분리막과 같은 다양한 분야에서 응용된다. 본 연구에서는 내화학성 특징을 갖는 polyvinylidene fluoride를 기반으로 하여 흡습 특성이 있는 zeolite가 첨가된 전기방사 필름의 수분 흡수 특성을 분석한다. Zeolite가 첨가된 전기방사 polyvinylidene fluoride 필름은 zeolite의 모세관 현상에 의해 수분 흡착이 발생하고, 연쇄적으로 필름의 다공성 구조 내부로 수분이 침투하는 현상이 나타난다. Zeolite가 포함된 전기방사 polyvinylidene fluoride 필름은 흡습 과정에서 형상 변화 없이 단위 질량 대비 4.2배의 수분 흡수 특성을 보인다.
Polyvinylidene fluoride
Electrospinning
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The gravitational thermal analysis,machine intensity analysis and contact angle determination were employed to characterize the performance of Polyvinylidene Fluoride membrane after hydrophilic modification.At 0.2MPa,the modified membrane was applied to separate the oily wastewater which oil concentration was lower than 200mg/L,and oil rejection effect of modified membrane was studied.The results show that the thermal stability and machine intensity were improved compared to Polyvinylidene Fluoride membrane.After modification,water contant angle was minished to 35°,pure water flux is over 115L/m2·h,and oil rejection ratio was higher than 85%.The performance of modified membrane is better than that of Polyvinylidene Fluoride membrane.
Polyvinylidene fluoride
Thermal Stability
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This present paper describes how polyvinylidene fluoride combats corrosion issue in pipeline of oil and gas industry. This study is crucial due to limited studies have been made upon polyvinylidene fluoride as a material for pipeline to prove its reliability and sustainability in the industry. Polyvinylidene fluoride will be tested upon its degradation over time. Tests will be executed upon the specimens of this material to prove that polyvinylidene fluoride has the better properties and favor compared to conventional materials in pipeline which are stainless and carbon steel. Upon this, the specimens of polyvinylidene fluoride will undergo tests to observe its water and chemical absorption at various parameters. Every samples of polyvinylidene fluoride will be tested upon its weight. This will show whether polyvinylidene fluoride is reliable due to its absorption rate. Study of this material will beneficial to oil and gas industry in future upon the reliability of polymers to sustain in oil and gas industry.
Polyvinylidene fluoride
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Polyvinylidene fluoride
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It was introduced of polyvinylidene fluoride( PVDF) membrane fouling principle and the modified PVDF membrane cleaning issures and cleaning mechanisms. Finally,It was analysed of the development tendency of modified PVDF membrane cleaning technology.
Polyvinylidene fluoride
Membrane Fouling
Biofouling
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Polyvinylidene fluoride
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This paper summarizes the characteristics of Polyvinylidene fluoride,and according to its force-voltage temperature-voltage and dynamic response relationships,the paper reviews the new developments of Polyvinylidene fluoride.And then discusses the deferences in making and relative merits between Polyvinylidene fluoride and piezoelectric ceramic.In the end,the application prospective of Polyvinylidene fluoride is introduced.
Polyvinylidene fluoride
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Supercapacitors store charge by adsorbing electrolyte ions; therefore, porous activated carbon with a large surface area is required to achieve a high capacitance. Porous carbon can be easily produced from polyvinylidene chloride (PVDC) and polyvinylidene fluoride (PVDF) precursors, which contain a carbon backbone and attached heteroatoms. The release of the heteroatoms during pyrolysis produces the porous carbon structure. This study explored the activation of both precursors using various chemical agents (ZnO, Mg(OH)2, and KOH) to develop pyrolyzed carbon with multiple micropores and mesopores. The activation process and relevant precursors were studied to implement the synthesized porous carbon as an electrode in supercapacitors. During the activation of PVDC-resin, ZnO served both as templates and chemical activating agents, while Mg(OH)2 served only as a template, and KOH served as a chemical activating agent. For the activation of PVDF, ZnO acted as a template and chemical activating agent, whereas Mg(OH)2 and KOH impeded activation owing to side reactions. Therefore, with using above chemical agents, PVDC-resin was converted to a carbon with higher surface area than that of the PVDF precursor. The porous carbon produced using PVDC-resin combined with KOH as activation agent had the highest specific capacitance (137 F g−1) owing to the successful creation of micropores and mesopores. Moreover, it exhibits an outstanding rate performance of 79% based on the cyclic voltammetry analysis at 50 mV s−1 (versus 5 mV s−1). This study demonstrates the best conditions for synthesizing porous carbon using polymer precursors and chemical agents for application in supercapacitors.
Polyvinylidene fluoride
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Supercapacitors store charge by adsorbing electrolyte ions; therefore, porous activated carbon with a large surface area is required to achieve a high capacitance. Porous carbon can be easily produced from polyvinylidene chloride (PVDC) and polyvinylidene fluoride (PVDF) precursors, which contain a carbon backbone and attached heteroatoms. The release of the heteroatoms during pyrolysis produces the porous carbon structure. This study explored the activation of both precursors using various chemical agents (ZnO, Mg(OH)2, and KOH) to develop pyrolyzed carbon with multiple micropores and mesopores. The activation process and relevant precursors were studied to implement the synthesized porous carbon as an electrode in supercapacitors. During the activation of PVDC-resin, ZnO served both as templates and chemical activating agents, while Mg(OH)2 served only as a template, and KOH served as a chemical activating agent. For the activation of PVDF, ZnO acted as a template and chemical activating agent, whereas Mg(OH)2 and KOH impeded activation owing to side reactions. Therefore, with using above chemical agents, PVDC-resin was converted to a carbon with higher surface area than that of the PVDF precursor. The porous carbon produced using PVDC-resin combined with KOH as activation agent had the highest specific capacitance (137 F g−1) owing to the successful creation of micropores and mesopores. Moreover, it exhibits an outstanding rate performance of 79% based on the cyclic voltammetry analysis at 50 mV s−1 (versus 5 mV s−1). This study demonstrates the best conditions for synthesizing porous carbon using polymer precursors and chemical agents for application in supercapacitors.
Polyvinylidene fluoride
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