Synthesis of PVA-g-POEM graft copolymers and their use in highly permeable thin film composite membranes
- Authors
- Kim, Do Hyun; Park, Min Su; Choi, Yeji; Lee, Ki Bong; Kim, Jong Hak
- Issue Date
- 15-8월-2018
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Graft copolymer; Poly(vinyl alcohol); Thin film; Composite membrane; CO2 separation
- Citation
- CHEMICAL ENGINEERING JOURNAL, v.346, pp.739 - 747
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMICAL ENGINEERING JOURNAL
- Volume
- 346
- Start Page
- 739
- End Page
- 747
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/73759
- DOI
- 10.1016/j.cej.2018.04.036
- ISSN
- 1385-8947
- Abstract
- Polymeric gas separation membranes are a viable solution to mitigate greenhouse gas emissions directly linked to global warming due to their environment-friendly synthetic process and low cost. Poly(vinyl alcohol) (PVA) synthesized via non-petroleum routes is an eco-friendly material with several advantages for membrane applications such as good film-forming properties, good compatibility, and water solubility. Despite these benefits, the gas barrier property of PVA prevents its application in gas separation membranes. Therefore, we synthesized a graft copolymer consisting of PVA main chains and poly(oxyethylene methacrylate) (POEM) side chains via one-pot free radical polymerization and applied it to a highly CO2 permeable thin film composite membrane. Synthesis of the PVA-g-POEM graft copolymer was confirmed by Fourier transform infrared and proton nuclear magnetic resonance spectroscopy. X-ray diffraction and differential scanning calorimetry analyses revealed that the crystallinity of PVA-g-POEM decreased gradually with increasing POEM content, with the PVA-g-POEM graft copolymer becoming amorphous at a POEM content of 64 wt%. The composite membrane prepared with PVA-gPOEM exhibited a high CO2 permeance (347.3 GPU) and moderate selectivity (21.6 for CO2/N-2). This performance is superior to other PVA-based membranes reported to date and is close to the target area for commercialization. The improved separation performance is due to the intermingled CO2-philic POEM side chains and the decrease in crystallinity of PVA.
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Collections - College of Engineering > Department of Chemical and Biological Engineering > 1. Journal Articles
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