Effect of inner non-solvent condition on morphology of PVDF hollow fiber membranes prepared by NIPS spinning process

淡江大學機構典藏 > 工學院 > 化學工程與材料工程學系暨研究所 > 期刊論文 > Item 987654321/116206

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题名:	Effect of inner non-solvent condition on morphology of PVDF hollow fiber membranes prepared by NIPS spinning process
作者:	Hsu-Hsien Chang;Sheng-Chang Chen;Liao-Ping Cheng
关键词:	PVDF;Hollow Fiber;Membrane;Morphology;NIPS
日期:	2018-03
上传时间:	2019-04-10 12:10:37 (UTC+8)
摘要:	Hollow fiber membranes of PVDF were prepared by isothermal wet spinning process from the water/DMF/PVDF system at 25 C. The dope solution comprised 21 wt% PVDF in DMF, and pure water was employed both as the inner and outer coagulants. SEM imaging of the membrane indicated an unexpected interesting morphology: columnar macrovoids extended from the outer surface to the central region, while cellular pores constituted the inner half of the membrane. As water was a harsh nonsolvent, one tended to think that macrovoids shall form towards the inner surface of the hollow fiber. Absence of macrovoids in this region was explained based on the fact that DMF would accumulate rapidly in the inner extruding stream as it underwent mass-exchange with water in the inner bath. Such activity rendered effectively the coagulant became effectively a soft one. As a result, macrovoids was eliminated and the inner surface became porous.
關聯:	Journal of Applied Science and Engineering 21(1), p.89-98
DOI:	10.6180/jase.201803_21(1).0011
显示于类别:	[化學工程與材料工程學系暨研究所] 期刊論文

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