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한대상,공명선 한국고분자학회 2010 Macromolecular Research Vol.18 No.3
New sulfobetaine zwitterion-containing copolymers were prepared by the copolymerization of [2-[(methacryloyloxy)ethyl]dimethyl] propyl ammonium bromide (MEPAB)/N,N-dimethyl-N-methacryloxyethyl-N-(3-sulfopropyl)ammonium (DMMSA) for a humidity-sensitive polyelectrolyte. The poly(MEPAB-co-DMMSA)s with a composition of 10/0, 8/2, 6/4, 4/6, 3/7, 2/8 and 0/10 were used to prepare resistive-type humidity sensors. The electrical properties of poly(MEPAB-co-DMMSA) with different amounts of MEPAB and DMMSA were examined as a function of the relative humidity to determine the contribution of the two salts on the sensing properties (linearity and sensitivity). Resistance of the humidity sensors obtained from the copolymers MEPAB and DMMSA varied from 107 to 102 Ω between 30%RH and 90%RH, which is suitable for a humidity sensor operating at ambient humidity. The humidity-sensing properties of MEPAB were enhanced by doping with a sulfo-betaine-type salt with a significantly different dissociation constant. The temperature dependence, hysteresis, response time, water durability,and long-term stability at high temperature and humidity were also measured.
한대상,공명선 한국고분자학회 2011 Macromolecular Research Vol.19 No.7
This paper reports a simple effective way to photochemically attach a polyelectrolyte layer to an electrode substrate. The system is based on photoreactive benzophenone (BP)-containing copolymers that are bound to alumina surfaces via an alkoxysilane coupling reaction. The alumina substrate was then covered with a BP film that can be reacted with the polyelectrolyte by irradiation with UV light. As a result of the photochemical reaction,the polyelectrolyte was bound covalently to the electrode surfaces. As an example, a thin layer of copolymer of [2-(acryloyloxy)ethyl]trimethyl ammonium chloride (AETAC), styrene (ST), 2-hydroxyethylacrylate (HEA), and 4-acryloxybenzophenone (BPA) (AETAC/ST/HEA/BPA=60/33/4/3) was attached successfully. A pretreatment of the substrate with BP-containing polymeric silane-coupling reagents, AETAC/3-(trimethoxysilyl)propyl methacrylate (TMSPM)/HEA/BPA=50/30/10/10 or TMSPM/HEA/BPA=50/25/25, was performed to improve the water durability and stability at high temperatures and humidity. Their water durability, high temperature/humidity stabilities and long-term stability were evaluated to confirm their usefulness as a humidity-sensing polyelectrolyte membrane.
한대상,정재헌,조홍식,조창제,이종무,장상목 동아대학교 공과대학부설 생산기술연구소 1998 生産技術硏究所硏究論文集 Vol.3 No.2
In this study, The method to produce anticorrosive paint using reproductive wastepaint was investigated. The liquid-phase resin, BHO-500 and powder-phase paint BHO-300 were produced through wastepaint reproductive process. BHO-500 and BHO-300 could be replaced respectively polyvinylchloride resin and filler, which are thr components of anticorrosive paint. The properties of the anticorrosive paint produced through this process were excellent in comparison with the existing anticorrosive paint.