Large-area PVDF membranes with through-thickness porosity prepared by uni-directional freezing
- Authors
- Kim, Byoung Soo; Lee, Min Kyung; Lee, Jonghwi
- Issue Date
- Feb-2013
- Publisher
- POLYMER SOC KOREA
- Keywords
- porous membrane; through-thick porosity; poly(vinylidene fluoride) (PVDF); freeze-drying; directional freezing
- Citation
- MACROMOLECULAR RESEARCH, v.21, no.2, pp 194 - 201
- Pages
- 8
- Journal Title
- MACROMOLECULAR RESEARCH
- Volume
- 21
- Number
- 2
- Start Page
- 194
- End Page
- 201
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/14898
- DOI
- 10.1007/s13233-013-1020-y
- ISSN
- 1598-5032
2092-7673
- Abstract
- An ideal microporous membrane has uniformity through-thickness pores with low tortuosity. In this study, a novel uni-directional freezing method to manufacture poly(vinylidene fluoride) (PVDF) membranes with ideal pore structures is proposed. Crack-free large-area membranes can be produced by inducing the directional growth of cylindrical solvent crystals at a controlled freezing speed and removing them by freeze drying or solvent etching. These membranes are uniform and are regularly arrayed through-thickness pores and relatively strong mechanical properties (modulus=75 MPa and tensile strain to break=0.1). Filterability tests where membranes are produced via freeze drying reveal a fast average filtration rate compared to commercial membranes. In addition, Xray diffraction and infrared spectroscopy results confirmed that uni-directional freezing increased the beta phase content, possibly by inducing polymer chain alignment through directional solvent crystal growth. The obtained findings show that the uni-directional freezing method is a simple and effective process to control through-thickness pore structures.
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Collections - College of Engineering > School of Chemical Engineering and Material Science > 1. Journal Articles
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