SCI和EI收录∣中国化工学会会刊

›› 2012, Vol. 20 ›› Issue (1): 71-79.

• FESTSCHRIFT IN HONOR OF THE 90TH BIRTHDAY OF PROF. CHEN JIAYONG • Previous Articles     Next Articles

Effects of Additives and Coagulant Temperature on Fabrication of High Performance PVDF/Pluronic F127 Blend Hollow Fiber Membranes via Nonsolvent Induced Phase Separation

Chun Heng Loh1,2, Rong Wang1,2   

  1. 1. School of Civil and Environmental Engineering, Nanyang Technological University, 639798 Singapore, Singapore;
    2. Singapore Membrane Technology Centre, Nanyang Technological University, 639798 Singapore, Singapore
  • Received:2011-08-22 Revised:2011-11-16 Online:2012-05-03 Published:2012-02-28

Effects of Additives and Coagulant Temperature on Fabrication of High Performance PVDF/Pluronic F127 Blend Hollow Fiber Membranes via Nonsolvent Induced Phase Separation

Chun Heng Loh1,2, Rong Wang1,2   

  1. 1. School of Civil and Environmental Engineering, Nanyang Technological University, 639798 Singapore, Singapore;
    2. Singapore Membrane Technology Centre, Nanyang Technological University, 639798 Singapore, Singapore
  • 通讯作者: Rong Wang,E-mail:rwang@ntu.edu.sg

Abstract: Poly(vinylidene fluoride)(PVDF) has become one of the most popular materials for membrane preparation via nonsolvent induced phase separation(NIPS) process.In this study,an amphiphilic block copolymer,Pluronic F127,has been used as both a pore-former and a surface-modifier in the fabrication of PVDF hollow fiber membranes to enhance the membrane permeability and hydrophilicity.The effects of 2nd additive and coagulant temperature on the formation of PVDF/Pluronic F127 membranes have also been investigated.The as-spun hollow fibers were characterized in terms of cross-sectional morphology,pure water permeation(PWP),relative molecular mass cut-off(MWCO),membrane chemistry,and hydrophilicity.It was observed that the addition of Pluronic F127 significantly increased the PWP of as-spun fibers,while the membrane contact angle was reduced.However,the size of macrovoids in the membranes was undesirably large.The addition of a 2nd additive,including lithium chloide(LiCl) and water,or an increase in coagulant temperature was found to effectively suppress the macrovoid formation in the Pluronic-containing membranes.In addition,the use of LiCl as a 2nd additive also further enhanced the PWP and hydrophilicity of the membranes,while the surface pore size became smaller.PVDF hollow fiber with a PWP as high as 2530 L·m-2L·m-2·h-1·MPa-1h-1·MPa-1,a MWCO of 53000 and a contact angle of 71° was successfully fabricated with 3%(by mass) of Pluronic F127 and 3%(by mass) of LiCl at a coagulant temperature of 25℃,which shows better performance as compared with most of PVDF hollow fiber membranes made by NIPS method.

Key words: amphiphilic block copolymer, pore forming, surface modifying, additive, poly(vinylidene fluoride), hollow fiber membrane

摘要: Poly(vinylidene fluoride)(PVDF) has become one of the most popular materials for membrane preparation via nonsolvent induced phase separation(NIPS) process.In this study,an amphiphilic block copolymer,Pluronic F127,has been used as both a pore-former and a surface-modifier in the fabrication of PVDF hollow fiber membranes to enhance the membrane permeability and hydrophilicity.The effects of 2nd additive and coagulant temperature on the formation of PVDF/Pluronic F127 membranes have also been investigated.The as-spun hollow fibers were characterized in terms of cross-sectional morphology,pure water permeation(PWP),relative molecular mass cut-off(MWCO),membrane chemistry,and hydrophilicity.It was observed that the addition of Pluronic F127 significantly increased the PWP of as-spun fibers,while the membrane contact angle was reduced.However,the size of macrovoids in the membranes was undesirably large.The addition of a 2nd additive,including lithium chloide(LiCl) and water,or an increase in coagulant temperature was found to effectively suppress the macrovoid formation in the Pluronic-containing membranes.In addition,the use of LiCl as a 2nd additive also further enhanced the PWP and hydrophilicity of the membranes,while the surface pore size became smaller.PVDF hollow fiber with a PWP as high as 2530 L·m-2L·m-2·h-1·MPa-1h-1·MPa-1,a MWCO of 53000 and a contact angle of 71° was successfully fabricated with 3%(by mass) of Pluronic F127 and 3%(by mass) of LiCl at a coagulant temperature of 25℃,which shows better performance as compared with most of PVDF hollow fiber membranes made by NIPS method.

关键词: amphiphilic block copolymer, pore forming, surface modifying, additive, poly(vinylidene fluoride), hollow fiber membrane

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