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양갑승,김찬,Jae-Wook Lee,Jong-Hyu Kim 한국화학공학회 2006 Korean Journal of Chemical Engineering Vol.23 No.4
This study focused on the preparation and electrochemical properties of bamboo-based activated carbons (ACs) through carbonization and subsequent activation with steam and non-aqueous electrolyte solutions. The specific surface areas and the capacitances of samples ranged from 445 to 1,025 m2/g and from 5 to 60 F/g, respectively, depending on the activation conditions. The sample activated at 900 oC for 60 min under our experimental conditions exhibited the highest capacitance and the largest specific surface area.
양갑승,이은영,박미숙,이기영,이영호 한국섬유공학회 1998 한국섬유공학회지 Vol.35 No.8
Pullulans from various sources were dissolved with and without additives to be spun. The additives employed were glycerol, maltitol and chitosan. The introduction of glycerol and chitosan respectively gave the effects of softening and strengthening of the fibers. The chitosan improved a fiber orientation which might resulted from hydrogen bonding or bonding interruption by chitosan molecules with the pullulan polymers. When urea was added in the pullulan solution as a hydrogen bond interrupter, the viscosity was reduced, which indicated a reduction of the intensity of hydrogen bonding. The pullulan exhibiting lower viscosity reduction by incorporating the urea addition showed better spinnability than that exhibiting higher viscosity drop. The better spinnability would obtain from less agglomerated solution introduced by hydrogen bonding.
에틸렌글리콜과 테레프탈산의 용해도 및 에스테르화 속도 (I)-테레프탈산의 농도 및 촉매의 영향-
양갑승,최창남 한국섬유공학회 1993 한국섬유공학회지 Vol.30 No.8
Pursueing high efficiency polymerization of poly (ethylene terephthalate)[PET], therlnodynamic and kinetic studies of esterification reaction between ethylene glycol (EG) and tcrephthalic acid(TPA) were performed. When a phase diagram was constructed with a function of TPA mole fraction in EG. the minimum cloud point was shown at the 30 mole % of TPA. The product at the composition contained most abundant bis- (hydroxyethyl terephthalate) [BHET] and it was verified by HPLC analysis. The phenomenon was explained with stoichimetry between TPA and EG. The effect of catalysts on the esterincation reaction was also studied by using KCA catalyst developed in KIST and Sb2O3 traditionally used in PET polymerization. In the presence of KCA catalyst the products were rather homogeneous and the catalyst acted to elevate the rate of reaction by a reduction of activation energy. The former behavior was verified by reduced number of peaks in DSC thermal diagram and the latter behavior by a reduction in clearing temperature. The elevated rate of the rcaction in the presence of KCA catalyst correlated to an increase in specific conductance originated from an increase in ionic concentration in the system.