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首页> 外文期刊>Polymers & Polymer Composites >Tailoring of Teflon-FEP Film Through Graft-Copolymerization with Polar Monomers for Desalination Processes: Effect of Swift Heavy Ion Irradiation
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Tailoring of Teflon-FEP Film Through Graft-Copolymerization with Polar Monomers for Desalination Processes: Effect of Swift Heavy Ion Irradiation

机译：通过与极性单体的接枝共聚为淡化工艺定制特氟龙-FEP薄膜：快速重离子辐照的影响

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摘要

In the present communication we report on the grafting of 4-vinyl pyridine (4-VP) and methacrylic acid (MAAc) onto Teflon-FEP film by a preirradiation method to synthesize ionic membranes. Optimum conditions pertaining to maximum percentage of grafting were evaluated as a function of different reaction parameters. Maximum percentage of grafting of 4-VP (13.66%) was obtained at an optimum total dose of 58.3 kGy at [4-VP] = 1.9 moles/L while MAAc produced 66.40% of maximum grafting at optimum conditions of 39.74 kGy total dose using [MAAc] = 2.5 moles/L in 10 ml of water. Effect of dose rate on grafting of 4-VP has also been discussed. The optimum conditions were used to graft 4-VP andMAAc onto Teflon-FEP film irradiated at different fluence with Swift heavy ions (SHIs) .Better grafting of 4-VP was obtained in the SHI irradiated films while MAAc produced lower grafting. The membranes were characterized by FTIR spectroscopy, scanning electron microscopy and thermo gravimetric analysis. Swelling studies of the membranes were performed in different polar solvents such as water, ethanol (EtOH), dimethyl sulphoxide (DMSO) and dimethyl formamide (DMF). Teflon-FEP-g-poly(4-VP) showed maximum swelling in water whereas in case of Teflon-EEP-g-poly (MAAc), maximum swelling was observed in DMSO. Conductance measurements in aqueous sodium chloride solution showed that these membranes have an affinity for Na~+ ions and Cl~- ions and hence can be used in desalination processes for the separation of ions.
机译：在本通讯中，我们报道了通过预辐照方法将4-乙烯基吡啶（4-VP）和甲基丙烯酸（MAAc）接枝到特氟龙-FEP膜上以合成离子膜。根据不同的反应参数评估了与最大接枝百分比有关的最佳条件。在[4-VP] = 1.9摩尔/升的最佳总剂量为58.3 kGy时，获得了4-VP的最大接枝百分比（13.66％），而在最佳条件下使用39.74 kGy的最佳条件下，MAAc产生了最大接枝的66.40％ [MAAc] = 2.5摩尔/升，在10毫升水中。还讨论了剂量率对4-VP接枝的影响。最佳条件是将4-VP和MAAc接枝到不同剂量的Swift重离子（SHIs）辐照的Teflon-FEP薄膜上。在SHI辐照的薄膜中获得了更好的4-VP接枝，而MAAc产生的接枝率更低。通过FTIR光谱，扫描电子显微镜和热重分析对膜进行表征。在不同的极性溶剂（例如水，乙醇（EtOH），二甲基亚砜（DMSO）和二甲基甲酰胺（DMF））中进行膜的溶胀研究。 Teflon-FEP-g-poly（4-VP）在水中显示最大溶胀，而在Teflon-EEP-g-poly（MAAc）情况下，在DMSO中观察到最大溶胀。在氯化钠水溶液中的电导率测量表明，这些膜对Na〜+离子和Cl〜-离子具有亲和力，因此可用于脱盐过程中分离离子。

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