The contrastive study of chemical treatment on the properties of hydrophobic PVDF membrane
The contrastive study of chemical treatment on the properties of hydrophobic PVDF membrane
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化学处理对疏水性PVDF膜性能的对比研究
DOI：
10.33736/jaspe.163.2015
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发表时间：
1970
期刊：
影响因子：
--
通讯作者：
M. F. Rabuni
中科院分区：
文献类型：
--
作者：
M. F. Rabuni
用氢氧化钾(KOH)、氢氧化钠(NaOH)和次氯酸钠(NaOCl)对聚偏氟乙烯(PVDF)平板膜进行了处理。对比研究了温度、处理时间和化学浓度对聚偏氟乙烯膜性能的影响。经过处理后，膜变得非常脆，名义伸长率降低到低至61%。温度的升高和时间的延长加速了PVDF与PVDF的化学反应，表现为膜的稳定性进一步下降。然而，这项研究中使用的处理条件被认为太温和，不能进行脱氢氟化过程。FTIR分析表明没有碳-碳双键形成，DSC分析表明熔融温度变化不大。由于表面结构的拉伸，所有处理后的膜都具有更大的孔径。结果表明，NaOCl对PVDF膜的稳定性影响最大，其次是NaOH和KOH。
In this study, polyvinylidene fluoride (PVDF) flat membranes were treated with potassium hydroxide (KOH), sodium hydroxide (NaOH) and sodium hypochlorite (NaOCl). The effects of temperature, treatment duration and chemical concentration towards the properties of PVDF membrane were contrastively studied. Following treatment, membrane became much brittle with a reduced nominal elongation to as low as 61%. Temperature elevation and prolonged treatment time accelerated the chemical reaction with PVDF as shown by further decline in the membrane stability. Nevertheless, the treatment conditions employed in this study are considered too mild for the dehydrofluorination process to occur. FTIR analysis indicated no carbon-carbon double bond formation and DSC analysis showed insignificant changes in the melting temperature. All treated membrane was observed to have larger pore size as a result of stretching on surface structure. Comparatively, acquired results showed that NaOCl has the most detrimental impact on the PVDF membrane stability, followed by NaOH and KOH.