Study on the membrane formation mechanism of PVDF/PVDF-CTFE blends

被引:13
|
作者
Gu, Jie [1 ]
Xu, Shengdong [1 ]
Lu, Xiaolong [1 ,2 ,3 ]
Ma, Ronghua [1 ]
Zhang, Shaozhe [1 ]
Zheng, Shuyun [1 ]
Wang, Hanli [4 ]
Shen, Hongmei [3 ]
机构
[1] Tiangong Univ, Sch Mat Sci & Engn, State Key Lab Separat Membranes & Membrane Proc, Tianjin 300387, Peoples R China
[2] Tianjin Motimo Membrane Tech Co Ltd, TEDA Tianjin, State Key Lab Membranes Mat & Membrane Applicat, 60 11th St, Tianjin 300457, Peoples R China
[3] Zhejiang Changxing Creflux Membrane Technol Co Ltd, Huzhou 313113, Zhejiang, Peoples R China
[4] Shandong Huaxia Shenzhou New Mat Co Ltd, State Key Lab Fluorine Containing Funct Membrane, Shandong, Peoples R China
基金
中国国家自然科学基金;
关键词
PVDF-CTFE; PVDF; Blend; Competitive precipitate; NIPS; HOLLOW-FIBER MEMBRANES; HYDROPHOBIC MEMBRANE; METALLOCENE CATALYSTS; ZIEGLER-NATTA; PERFORMANCE; DISTILLATION; DESALINATION; ACRYLATE); LAYER;
D O I
10.1016/j.jtice.2022.104655
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Background: The low hydrophobicity and weak alkali resistance of PVDF limit its application in the field of hydrophobic membranes, so membrane modification is necessary. Blending is one of the common modification methods, and membrane preparation and modification are completed simultaneously. Exploring suitable blending system and studying its membrane formation mechanism is the key to obtain excellent hydrophobic membranes. Methods: XPS and EDX techniques were used to detect the content of PVDF-CTFE on the membrane surfaceinterfaces to explore the formation mechanism of blend membranes. And it was further explained by the changes of membrane properties such as water contact angle, alkali resistance, mechanical strength, etc. Significant findings: We believe that there was a unique competitive precipitation mechanism for the mixed system of PVDF-CTFE and PVDF in the process of membrane formation via the NIPS method. The PVDF-CTFE will preferentially precipitate to form the membrane surface-interfaces (blend membrane surface and pore wall). While the PVDF subsequently precipitates to form the sponge-like structure, constituting the membrane body. This may further improve the basic theory of blend membrane preparation and is expected to be extended to the investigation of other mixed systems.
引用
收藏
页数:7
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