Convenient Preparation of Lon-Exchange PVdF Membranes by a Radiation-Induced Graft Polymerization for a Battery Separator

Abstract

초록: 메탄올 용매에서 고분자 촉진 단량체와 소디윰 스티렌 슐포네이트를 방사선 그래프트 방법으로 양이온 교 환 PVdF 맴브레인을 제조하였다. 고분자 촉진 단량체로서 스티렌, 아크릴산, 비닐 피롤리돈을 사용하였다. 또한, 음이온 교환 PVdF 맴브레인도 방사선 그래프트 중합법에 의해 제조하였다. 양이온 및 음이온 교환 PVdF 맴브레인은 SEM, XPS 그리고 열분석기기를 통해 특성평가를 하였고 성공적으로 합성됨을 확인할 수 있었다. 그래프트 수율, 이온교환기 의 양 및 침투율은 각각 30.0∼32.3%, 2.81∼3.01 mmol/g 그리고 66.6∼147%로 평가되었으며, 20 ℃에서 이온 전 도도를 측정한 결과 0.020∼0.053 S/cm 이었다. 최종적으로, 제조된 양이온 및 음이온교환 PVdF 맴브레인은 전지 격막으로서 충분히 사용될 수 있음을 확인할 수 있었다.Abstract: A cation-exchange nanofiber poly(vinylidene fluoride) (PVdF) membrane was prepared by a radiation-induced graft polymerization (RIGP) of sodium styrene sulfonate (NaSS) in the presence of the polymerizable access agents in methanol solution. The used polymerizable access agents include styrene, acrylic acid, and vinyl pyrrolidone. The anion-exchange nanofiber PVdF membrane was also prepared by RIGP of glycidyl methacrylate (GMA) and its subsequent chemical modification. The successful preparations of cation-and anion-exchange PVdF membranes were confirmed via SEM,XPS and thermal analysis. The content of the grafting yield, ion-exchange group, and water uptake was in the range of 30.0∼32.3%, 2.81∼3.01 mmol/g and 66.6∼147%, respectively. The proton conductivity at 20 ℃ was in the range of 0.020∼0.053 S/cm. From the result, the prepared ionexchange PVdF membrane can be used as a separator in battery cells.

Radiation-Grafted Membranes for Polymer Electrolyte Fuel Cells: Current Trends and Future Directions

“…On the other hand, PEMs with SA groups were successfully prepared on the basis of electrospun nanofibers of PVDF by the RIG of SStS in the presence of comonomers such as St, AAc, or NVP. The proton conductivity at 20 °C was in the range 20–53 mS cm –1 , and an average DG of 30–32% and IEC of 2.8 mmol g –1 were found . Further details on their performance in fuel cells were not reported.…”

“…The durability of radiation-grafted PEMs was found to vary significantly depending on the starting polymeric materials, the composition of the monomer system, the RIG technique employed, reaction parameters, and not least the method of assembling the membrane with the electrodes. ,,− A number of new preparative routes for introducing substantial improvements in the stability of the desired PEMs have been proposed. These include three main strategies: (i) the grafting of alternative monomers such as m , p -methylstyrene or vinyltoluene, , p - tert -butylstyrene, vinylbenzyl chloride, , p -styryltrimethoxysilane, , methyl acrylate, and 2-bromotetrafluoroethyl trifluorovinyl ether and monomer combinations such as styrene/α-methylstyrene, styrene/acrylonitrile, styrene/methylacrylnitrile, ,,, styrene/acrylic acid, ,, styrene/methyl methacrylic acid, α-methylstyrene/methylacrylnitrile, , styrene/glycidyl methacrylate, , styrene/trimethoxysilylpropyl methacrylate, and methyl acrylate/methyl methacrylate; (ii) the introduction of new or modified substrate films for grafting of styrene or its derivatives with or without cross-linkers such as cross-linked PTFE, ,,,,,,,− engineering plastics such as poly­(ether ether ketone), ,− polyimide, , polyether sulfone, alicyclic polybenzimidazole, polymer powder (e.g., UHMWPE or PVDF) followed by thermal treatment, − or solution casting, porous films, ,,,​ − and nanofibrous mats; and finally (iii) the application of n...…”

Radiation-grafted materials for energy conversion and energy storage applications

“…In particular, membranes with sulfonic acid groups were prepared by radiation- pyrrolidone [95]. The proton conductivity at 20℃ was in the range of 0.020-0.053 S/cm at an average grafting yield of 30-32% and IEC of 2.8 mmol/g.…”

Electrospun Nanofiber Membranes and Their Applications in Water and Wastewater Treatment

“…Conventional synthetic polymers such as polyvinylidene fluoride (PVDF) were first used as battery separator as well as in fuel cell and solar cell applications [22,23] and later in ultrafiltration and membrane distillation applications [18,24]. Other polymers such as polyacrylonitrile (PAN) [25][26][27][28][29][30], CA [31][32][33], and PEO [14,34] were electrospun alone or together with other copolymers.…”