Effect of Interface Pre-wetting on Performance of Heterogeneous Reinforced Polyvinylidene Fluoride Hollow Fiber Membranes

Zhi-li Fan; Chang-fa Xiao; Hai-liang Liu; Xiao-yu Hu; Guo-lan Huan

doi:10.11777/j.issn1000-3304.2014.14076

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Effect of Interface Pre-wetting on Performance of Heterogeneous Reinforced Polyvinylidene Fluoride Hollow Fiber Membranes

Research Article | 更新时间：2021-03-19

- Effect of Interface Pre-wetting on Performance of Heterogeneous Reinforced Polyvinylidene Fluoride Hollow Fiber Membranes
- Acta Polymerica Sinica Issue 11, Pages: 1508-1516(2014)
- 作者机构：
  
  天津工业大学中空纤维膜材料与膜过程省部共建国家重点实验室培育基地,天津,300387
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2014.14076
  CLC：
- Published：20 November 2014，
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Zhi-li Fan, Chang-fa Xiao, Hai-liang Liu, Xiao-yu Hu, Guo-lan Huan. Effect of Interface Pre-wetting on Performance of Heterogeneous Reinforced Polyvinylidene Fluoride Hollow Fiber Membranes. [J]. Acta Polymerica Sinica (11):1508-1516(2014)
DOI：

Zhi-li Fan, Chang-fa Xiao, Hai-liang Liu, Xiao-yu Hu, Guo-lan Huan. Effect of Interface Pre-wetting on Performance of Heterogeneous Reinforced Polyvinylidene Fluoride Hollow Fiber Membranes. [J]. Acta Polymerica Sinica (11):1508-1516(2014) DOI： 10.11777/j.issn1000-3304.2014.14076.

摘要

以熔融纺丝聚氯乙烯（PVC）中空纤维多孔膜为增强体，聚偏氟乙烯（PVDF）为成膜聚合物，聚乙烯吡咯烷酮（PVP）为添加剂，N，N-二甲基乙酰胺（DMAc）为溶剂，配置铸膜液，采用同心圆牵引-涂覆法制备了异质增强型PVDF中空纤维膜.制备过程中，采用预湿溶液对增强体基膜表面进行预处理，研究了预湿溶液组成及含量对异质增强型PVDF中空纤维膜结构与性能的影响.结果表明，未经预湿处理的异质增强型PVDF中空纤维膜具有较厚的致密界面层；预湿溶液可对基膜表面孔起到保护作用，使异质增强型PVDF中空纤维膜的界面层变薄或形成多孔界面层，有益于改善增强型PVDF中空纤维膜的通透性能；与二甲基乙酰胺（DMAc）水溶液相比，以乙醇水溶液为预湿溶液所得异质增强型PVDF中空纤维膜的性能较优；当预湿液中乙醇含量为60 wt%时，所得增强型PVDF中空纤维膜的渗透性能较优，拉伸强度可达8.61 MPa.

Abstract

Heterogeneous reinforced (HR) polywinylidene fluoride(PVDF) hollow fiber membranes consisting of polyvinyl chloride (PVC) matrix membrane and PVDF coating layer were fabricated via concentric circles coating process.The polyvinyl chloride (PVC) matrix membrane with macroporous structure was prepared by melt-spinning method.While the coating layer was obtained by non-solvent induced phase separation method with PVDF as the polymer matrix

dimethylacetamide (DMAc) as the solvent

and polyvinylpyrrolidone (PVP) as the pore-forming agent.During the coating process

high concentration DMAc of polymer solutions could infiltrate into the surface pore of PVC hollow fiber membranes due to the effect of capillary force.Interface layer was formed between the coating layer and the matrix membrane of the HR PVDF hollow fiber membranes with compact structure.Therefore

pre-wetting solutions were used for the pretreatment of PVC matrix membranes before the coating process.The influences of pre-wetting solutions on structure and performance of HR membranes were investigated.The results showed that the interface layer of HR membranes without pre-wetting solutions was thick and dense.Because of the protection of pre-wetting solutions to surface pores of matrix membrane

the interface layer of HR membranes was thin and porous.The performance of HR membranes with pre-wetting solutions of ethanol and ethanol aqueous solutions were better than that of the DMAc aqueous solutions.The optimal permeability of HR membranes was obtained as the ethanol concentration of pre-wetting solutions reached to 60 wt%.The tensile strength of HR PVDF hollow fiber membrane was nearly 9 MPa.The results also showed that the interface adhesion between reinforcement and separation surface had a good combination in the range of 40% elongation.

关键词

聚偏氟乙烯异质增强中空纤维膜预湿处理界面层

Keywords

Polywinylidene fluorideHeterogeneous ReinforceHollow fiber membranePre-wettingInterface

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Related Institution

State Key Laboratory of Separation Membranes and Membrane Processes, School of Textile Science and Engineering, Tianjin Polytechnic University

State Key Laboratory of Separation Membranes and Membrane Processes, School of Materials Science and Engineering, Tianjin Polytechnic University

Department of Textiles, Tianjin Polytechnic University, State Key Laboratory of Hollow Fiber Membrane Materials and Processes, Tianjin Polytechnic University

Department of Material Science and Engineering, Tianjin Polytechnic University, State Key Laboratory of Hollow Fiber Membrane Materials and Processes, Tianjin Polytechnic University

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