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유덕만,김태호,남수환,윤상준,이장용,남상용,홍영택 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-
A hydrocarbon membrane-based membrane electrode assembly (MEA) is fabricated by attachingpolyacrylonitrile (PAN) films to a sulfonated poly(arylene ether sulfone) (SPAES) membrane to improvethe durability of a proton exchange membrane fuel cell (PEMFC) under cyclic hydration and dehydration. The edge protective PAN film is prepared by bar-coating to be extremely thin (6 1 mm thick) in order tominimize the increase in the MEA resistance. This study focuses on comparing the pristine membrane withthe membrane using the PAN film to identify the effect of the edge protective film. Therefore, durability testwith hydration–dehydration cycles is conducted to evaluate it
유덕만,윤상준,김태호,이장용,이재락,홍영택 한국고분자학회 2014 Macromolecular Research Vol.22 No.1
Poly(amide-co-imide)-poly(trimellitic anhydride chloride-co-4,4'-methylenedianiline) (PAI-PTM) blendswere prepared for fabricating nonwoven composite membranes by electrospinning method. The characteristics ofthe membranes were investigated by scanning electron microscopy (SEM), porometer, and universal tensile machine(UTM). Sulfonated poly(arylene ether sulfone) (SPAES) copolymer was synthesized with 50 degrees of sulfonationas a hydrocarbon-based ionomer for proton exchange membrane fuel cells (PEMFCs). The novel composite membranewas fabricated by impregnating SPAES copolymer into the PAI-PTM nonwoven membrane. The PAI-PTMnonwoven membrane exhibited high porosity and adequate mechanical properties, which could improve the dimensionalstability (26 vol% decrease) from the swelling of SPAES copolymer in water. For the single cell test, the compositemembrane showed comparable performance (1.07 A/cm2 at 0.6 V) to that of Nafion 212 (1.02 A/cm2 at 0.6 V)and outstanding durability in the open circuit voltage (OCV) holding test.
Properties of Polyurethane/Hectorite Nanocomposite Elastomer Using Reactive Organifier
유덕만,Hua Jin,김성철 한국고분자학회 2010 Macromolecular Research Vol.18 No.1
Elastomers were prepared using organoclays with a reactive organifier. A reactive organifier with a hydroxyl end group to react with diisocyanate was synthesized. For the clay, Laponite RD, a synthetic hectorite clay with a shorter aspect ratio but better dispersibility than montmorillonite was used. The ion-exchanged fraction (IEF)of the organoclays increased with increasing molecular weight of the organifier. The d-spacing was increased from 1.1 nm to 2.08 nm. For the tensile properties, polyurethane nanocomposites with better dispersion of the organoclay showed a larger increase in Young’s modulus. The tensile strength showed the highest increase, from 17.1 to 24.8 MPa (45% increase), with only 0.43% of the inorganic additive.
Realizing Sub-10 nm Nanostructures Using Responsive Block Copolymers by a Solid-State Transformation
유덕만 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
In this study, a high χ-low N system was developed for a self- assembled BCP morphology with a sub-10 nm period through an acid-catalyzed hydrolysis of symmetric poly(solketal methacrylate-b-styrene) (PSM-b-PS) copolymers. The acid-catalyzed hydrolysis transforms PSM-b- PS, having two hydrophobic blocks, into poly(glycerol monomethacrylate- b-styrene) (PGM-b-PS), having one hydrophilic and one hydrophobic block. This simple transformation significantly enhances χ such that a phase-mixed PSM-b-PS can be transformed in the solid-state into a microphase separated BCP without the use of any additives. Small-angle X-ray scattering (SAXS) measurements as functions of the degree of polymerization and PSM conversion were performed to examine the lamellar microdomain features. With the large increase in χ, even smallest synthesized PGM-b-PS copolymers underwent microphase separation, allowing us to achieve a center-to-center lamellar microdomain spacing of 5.4 nm.