Stability of PVDF hollow fibre membranes in sodium hydroxide aqueous solution
Stability of PVDF hollow fibre membranes in sodium hydroxide aqueous solution
复制标题
DOI：
10.1016/j.ces.2010.12.019
复制
发表时间：
2011-04-15
影响因子：
4.7
通讯作者：
Li, K.
中科院分区：
文献类型：
--
作者：
Hashim, N. Awanis;Liu, Yutie;Li, K.
研究了聚偏氟乙烯中空纤维膜在氢氧化钠水溶液中的稳定性。PVDF中空纤维膜由来自两个主要供应商（AtofinaChemicalsInc.，USA和Solvay，Belgium）进行比较。通过力学强度测定、比表面积分析、XRD、FTIR和DSC分析，研究了NaOH浓度、处理时间和温度对PVDF中空纤维膜力学性能、热性能和结晶结构的影响。所得到的结果表明，PVDF和NaOH之间的反应开始，即使在低浓度的NaOH，并加剧与延长的处理时间，导致在PVDF中空纤维膜的机械强度和结晶度的下降。通过增加NaOH浓度和/或处理温度来加速和强化反应。在70 ℃下，PVDF膜的机械完整性在4wt%NaOH溶液中在24小时内或在10wt%NaOH溶液中在8小时内被完全破坏。NaOH溶液中的稳定性劣化被认为是本研究中使用的所有PVDF的普遍现象，与原材料或相应的中空纤维膜无关。(C)2010爱思唯尔有限公司保留所有权利。
The stability of PVDF hollow fibre membranes in sodium hydroxide (NaOH) aqueous solutions were investigated in this study. PVDF hollow fibre membranes were prepared from each of the three commercial raw PVDF materials (Kynar761, Solef 1015 and Solef 6010) from two major suppliers (AtofinaChemicalsInc., USA and Solvay, Belgium) for comparison purposes. The effect of NaOH concentration, treatment time and temperature on mechanical properties, thermal properties and crystalline structure of the PVDF hollow fibre membranes were investigated through mechanical strength measurement, surface area analysis, XRD, FTIR and DSC analyses. The obtained results indicate that the reaction between PVDF and NaOH was initiated even at low concentrations of NaOH and was aggravated with the extended treatment time, resulting in the decrease in mechanical strength and crystallinity of PVDF hollow fibre membranes. The reaction was accelerated and intensified by increasing the concentration of NaOH and/or treatment temperature. At 70 degrees C, the mechanical integrity of the PVDF membranes was completely destroyed in 4 wt% NaOH solution within 24 h or in 10 wt% NaOH solution within 8 h. The deterioration of stability in NaOH solutions is considered universal for all PVDF employed in this study, irrespective of the raw materials or the corresponding hollow fibre membranes. (C) 2010 Elsevier Ltd. All rights reserved.