Effect of take-up speed on polyvinylidene fluoride hollow fiber membrane in a thermally induced phase separation process

• Published in: Journal of applied polymer science Vol. 128; no. 2; pp. 1054 - 1060
• Main Authors: Li, Xianfeng, Liu, Huiyu, Xiao, Changfa, Ma, Shihu, Zhao, Xuehui
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 15.04.2013; Wiley; Wiley Subscription Services, Inc
• Subjects: Agglomeration; Applied sciences; Exact sciences and technology; Exchange resins and membranes; Fibers; Fibers and threads; Flux; Forms of application and semi-finished materials; hollow fiber membrane; Materials science; Membranes; Phase separation; Polymer industry, paints, wood; Polymers; polyvinylidene fluoride (PVDF); Polyvinylidene fluorides; Porosity; Reproduction; structure; take-up speed (TS); Technology of polymers; thermally induced phase separation (TIPS); Transport properties; Synthetic fiber; Mechanical properties; Experimental study; Property processing relationship; Porous material; thermally induced phase separation (TIPS); structure; Water permeability; Structure processing relationship; hollow fiber membrane; Morphology; Phase separation; Vinylidene fluoride polymer; polyvinylidene fluoride (PVDF); Hollow fiber; take-up speed (TS); Membrane; Porosity
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.37919

The porous polyvinylidene fluoride hollow fiber membranes were prepared via the thermally induced phase separation process using mixed diluent. The effects of take‐up speed on the structure of membranes were investigated by scanning electron microscopy, differential scanning calorimetry, and wide‐angle X‐ray diffraction. The membrane properties were measured in terms of the pure water flux, porosity, and mechanical properties. The results showed that the cross‐sectional structure of membrane had an obvious change and presented a uniform structure when TS increased to 72 m min−1, whereas the membrane made from TS <41 m min− presented an interconnected aggregation structure. However, the change of surface structure of all membranes was hardly observed. In addition, the strength and elongation of breakage of membrane increased obviously with the increase of TS, whereas the pure water flux and porosity changed slightly. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013