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Development of asymmetric BTDA-TDI/MDI (P84) copolyimide flat sheet and hollow fiber membranes for ultrafiltration : morphology transition and membrane performance.

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Development of asymmetric BTDA-TDI/MDI (P84) copolyimide flat sheet and hollow fiber membranes for ultrafiltration : morphology transition and membrane performance.
นักวิจัย : Ren, Jizhong. , Li, Zhansheng.
คำค้น : -
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2554
อ้างอิง : Ren, J., & Li, Z. (2012). Development of asymmetric BTDA-TDI/MDI (P84) copolyimide flat sheet and hollow fiber membranes for ultrafiltration: Morphology transition and membrane performance. Desalination, 285, 336-344. , 0011-9164 , http://hdl.handle.net/10220/10867 , http://dx.doi.org/10.1016/j.desal.2011.10.024
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Desalination
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

In this paper, the effects of γ-butyrolactone (GBL) weight ratio (wGBL) and membrane thickness on the formation of asymmetric flat sheet membranes prepared with P84 (BTDA-TDI/MDI co-polyimide)/N-methyl-2-pyrrolidone (NMP)/GBL casting solutions are investigated. With the increase of membrane thickness, the transition of membrane morphology from sponge-like to finger-like structure occurs at critical structure-transition thickness Lc. Lc and the general sponge-like structure thickness (Lgs) increase with wGBL. For 20 wt.% P84/NMP/GBL casting solution, the membrane morphology changes from finger-like to sponge-like structure at the critical weight ratio of GBL (w⁎ = 0.69). The membrane morphology and performance of hollow fibers spun with various wGBL are observed. Compared with the hollow fiber membranes made of 18 wt.% P84/NMP/GBL dope solution with wGBL = 0.75, the hollow fiber membranes spun with wGBL = 0.25 present a higher permeation flux and a larger MWCO. As wGBL increases from 0.25 to 0.75, the membrane morphology transfers from finger-like to sponge-like structure. An increase in shear rate shifts the rejection curves towards left, and lowers the MWCO of hollow fiber membranes. For hollow fiber membranes spun with wGBL = 0.75, a relatively high permeation flux and a large MWCO are obtained by the wet spinning process.

บรรณานุกรม :
Ren, Jizhong. , Li, Zhansheng. . (2554). Development of asymmetric BTDA-TDI/MDI (P84) copolyimide flat sheet and hollow fiber membranes for ultrafiltration : morphology transition and membrane performance..
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Ren, Jizhong. , Li, Zhansheng. . 2554. "Development of asymmetric BTDA-TDI/MDI (P84) copolyimide flat sheet and hollow fiber membranes for ultrafiltration : morphology transition and membrane performance.".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Ren, Jizhong. , Li, Zhansheng. . "Development of asymmetric BTDA-TDI/MDI (P84) copolyimide flat sheet and hollow fiber membranes for ultrafiltration : morphology transition and membrane performance.."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2554. Print.
Ren, Jizhong. , Li, Zhansheng. . Development of asymmetric BTDA-TDI/MDI (P84) copolyimide flat sheet and hollow fiber membranes for ultrafiltration : morphology transition and membrane performance.. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2554.