Lu Fang, Liu Hailiang, Xiao Changfa, Wang Xinya, Chen Kaikai, Huang Heng
State Key Laboratory of Separation Membranes and Membrane Processes, National Center for International Joint Research on Separation Membranes, Tianjin Polytechnic University Tianjin 300387 China
RSC Adv. 2019 Feb 26;9(12):6699-6707. doi: 10.1039/c9ra00265k. eCollection 2019 Feb 22.
In this work, polyvinyl chloride (PVC) hollow fiber membranes were prepared a melt-spinning method and on-line stretching treatment. Gamma-butyrolactone (GBL) and epoxidized soybean oil (ESO) were selected as the solvent and the thermal stabilizer, respectively. The effects of on-line stretching treatment on the membrane structure and performance were characterized by means of morphology, surface roughness, pore size distribution, permeation performance and so on. The morphology showed that the prepared PVC hollow fiber membrane belonged to a homogeneous membrane. The on-line stretching treatment decreased the roughness of the inner surface and the outer surface, but it increased the water contact angle, mean pore size, porosity and pure water flux. Meanwhile, the pore size distribution range remained stable and narrow. The rejection of Direct Black 19 particles was higher than 90% when it approached a steady value. This type of membrane filtration was a deep intercept. Furthermore, the tensile strength increased with the increment of stretching ratio, and the elongation at break showed the opposite trend. The biggest tensile strength could be obtained as the stretching ratio reached 3.0 and was 23.89 MPa.
在本工作中，采用熔融纺丝法和在线拉伸处理制备了聚氯乙烯（PVC）中空纤维膜。分别选用γ-丁内酯（GBL）和环氧大豆油（ESO）作为溶剂和热稳定剂。通过形态、表面粗糙度、孔径分布、渗透性能等手段表征了在线拉伸处理对膜结构和性能的影响。形态表明制备的PVC中空纤维膜属于均质膜。在线拉伸处理降低了内表面和外表面的粗糙度，但增加了水接触角、平均孔径、孔隙率和纯水通量。同时，孔径分布范围保持稳定且狭窄。当直接黑19颗粒接近稳定值时，截留率高于90%。这种膜过滤属于深度截留。此外，拉伸强度随拉伸比的增加而增加，断裂伸长率呈现相反趋势。当拉伸比达到3.0时，可获得最大拉伸强度，为23.89MPa。
