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Weber, Jens,Du, Naiying,Guiver, Michael D. American Chemical Society 2011 Macromolecules Vol.44 No.7
<P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/mamobx/2011/mamobx.2011.44.issue-7/ma101447h/production/images/medium/ma-2010-01447h_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ma101447h'>ACS Electronic Supporting Info</A></P>
Kim, Dae-Sik,Guiver, Michael D.,Seo, Mu-Young,Cho, Hyun-Il,Kim, Dae-Hoon,Rhim, Ji-Won,Moon, Go-Young,Nam, Sang-Yong The Polymer Society of Korea 2007 Macromolecular Research Vol.15 No.5
In the present study, crosslinked poly(vinyl alcohol) (PVA) membranes were prepared at different temperatures using poly(styrene sulfonic acid-co-maleic acid) (PSSA_MA) (PVA:PSSA_MA = 1:9). The hybrid mem-branes were prepared by varying the TEOS content between 5 and 30 wt%. The PSSA_MA was used both as a crosslinking agent and the hydrophilic group donor ($-SO_3H$ and/or-COOH). The proton conductivity increased with up to 20 wt% TEOS, but decreased above this level, although the water content decreased with increasing TEOS content. This result suggests that the silica doped into the membrane improved the formation of proton-conduction pathways due to the absorption of molecular water. The PVA/PSSA_MA/Silica containing TEOS 20% showed both high proton conductivity (0.026 S/cm at $90^{\circ}C$) and low methanol permeability ($5.55{\times}10^{-7}cm^2/s$).
Shin, Dong Won,Guiver, Michael D.,Lee, Young Moo American Chemical Society [etc.] 2017 Chemical reviews Vol.117 No.6
<P>A fundamental understanding of polymer microstructure is important in order to design novel polymer electrolyte membranes (PEMs) with excellent electrochemical performance and stabilities. Hydrocarbon-based polymers have distinct microstructure according to their chemical structure. The ionic clusters and/or channels play a critical role in PEMs, affecting ion conductivity and water transport, especially at medium temperature and low relative humidity (RH). In addition, physical properties such as water uptake and dimensional swelling behavior depend strongly on polymer morphology. Over the past few decades, much research has focused on the synthetic development and microstructural characterization of hydrocarbon-based PEM materials. Furthermore, blends, composites, pressing, shear field, electrical field, surface modification, and cross-linking have also been shown to be effective approaches to obtain/maintain well-defined PEM microstructure. This review summarizes recent work on developments in advanced PEMs with various chemical structures and architecture and the resulting polymer microstructures and morphologies that arise for potential application in fuel cell, lithium ion battery, redox flow battery, actuators, and electrodialysis.</P>
Tröger's Base를 도입한 폴리 이미드 고분자의 합성
이원희,성종근,Yongbing Zhuang,도유성,Michael D. Guiver,이영무 한국막학회 2016 한국막학회 총회 및 학술발표회 Vol.2016 No.11
Polymeric materials have been widely used in energy-related applications including fabrication of batteries and fuel cells, pressure retarded osmosis, gas separation and reverse electrodialysis processes. Despite these various versatility, their poor mechanical properties still remain as obstacles for applying to industrial levels. As a way of improving the mechanical properties, Tröger's Base (TB) which is a rigid, V-shaped, and bridged bicyclic amine have been recently introduced. In this work, polyimides incorporating TB units (PI-TBs) were synthesized in-situ polycondensation reaction using dimethoxymethane (DMM). PI-TB membranes were prepared and physicochemical characteristics including mechancial properties were investigated.
A new class of highly-conducting polymer electrolyte membranes: Aromatic ABA triblock copolymers
Li, Nanwen,Lee, So Young,Liu, Ying-Ling,Lee, Young Moo,Guiver, Michael D. The Royal Society of Chemistry 2012 Energy & environmental science Vol.5 No.1
<p>Highly proton-conducting polymer electrolyte membrane (PEMs) materials are presented as alternatives to state-of-the-art perfluorinated polymers such as Nafion<SUP>®</SUP>. To achieve stable PEMs with efficient ionic nanochannels, novel fully aromatic ABA triblock copolymers (SP3O-<I>b</I>-PAES-<I>b</I>-SP3O) based on sulfonated poly(2,6-diphenyl-1,4-phenylene oxide)s (A, SP3O) and poly(arylene ether sulfone)s (B, PAES) were synthesized. This molecular design for a PEM was implemented to promote the nanophase separation between the hydrophobic polymer chain and hydrophilic ionic groups, and thus to form well-connected hydrophilic nanochannels that are responsible for the water uptake and proton conduction. Relative to other hydrocarbon-based PEMs, the triblock copolymer membranes showed a dramatic enhancement in proton conductivity under partially hydrated conditions, and superior thermal, oxidative and hydrolytic stabilities, suggesting that they have the potential to be utilized as alternative materials in applications operating under partly hydrated environments.</p> <P>Graphic Abstract</P><P>Fully aromatic ABA triblock copolymers with highly sulfonated blocks provide nanochannels leading to efficient proton transport. <img src='http://pubs.rsc.org/ej/EE/2012/c1ee02556b/c1ee02556b-ga.gif'> </P>