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Open AccessArticle

Effects of Room Temperature Stretching and Annealing on the Crystallization Behavior and Performance of Polyvinylidene Fluoride Hollow Fiber Membranes

1
College of Chemistry and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China
2
Beijing Key Laboratory of Membrane Materials and Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
3
Beijing Scinor Membrane Technology Co. Ltd., Bejing, 100083, China
4
Sinopec Economics & Development Research Institute, Beijing 100029, China
5
Small and medium-sized enterprise service center of Quzhou, Zhejiang 324000, China
*
Author to whom correspondence should be addressed.
Membranes 2020, 10(3), 38; https://doi.org/10.3390/membranes10030038
Received: 11 February 2020 / Revised: 28 February 2020 / Accepted: 28 February 2020 / Published: 29 February 2020
(This article belongs to the Section Membrane Preparation and Characterization)
A treatment consisting of room temperature stretching and subsequent annealing was utilized to regulate the morphology and performance of polyvinylidene fluoride (PVDF) hollow fiber membranes. The effects of stretching ratios and stretching rates on the crystallization behavior, morphology, and performance of the PVDF membranes were investigated. The results showed that the treatment resulted in generation of the β crystalline phase PVDF and increased the crystallinity of the membrane materials. The treatment also brought about the orientation of the membrane pores along the stretching direction and led to an increase in the mean pore size of the membranes. In addition, as the stretching ratio increased, the tensile strength and permeation flux were improved while the elongation at break was depressed. However, compared to the stretching ratio, the stretching rate had less influence on the membrane structure and performance. In general, as the stretching ratio was 50% and the stretching rate was 20 mm/min, the tensile strength was increased by 36% to 7.47 MPa, and the pure water flux was as high as 776.28 L/(m2·h·0.1bar), while the mean pore size was not changed significantly. This research proved that the room temperature stretching and subsequent annealing was a simple but effective method for regulating the structure and the performance of the PVDF porous membranes. View Full-Text
Keywords: poly(vinylidene fluoride); hollow fiber microporous membrane; room temperature stretching; annealing; crystallization poly(vinylidene fluoride); hollow fiber microporous membrane; room temperature stretching; annealing; crystallization
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MDPI and ACS Style

Tang, Y.; Lin, Y.; Lin, H.; Li, C.; Zhou, B.; Wang, X. Effects of Room Temperature Stretching and Annealing on the Crystallization Behavior and Performance of Polyvinylidene Fluoride Hollow Fiber Membranes. Membranes 2020, 10, 38.

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