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- 저자 : 정병옥 ( Jeong Byeong Og ) (검색결과 2 건)
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N,N-Dimethylacrylamide-g-Chitosan 공중합체의 유화안정성
정병옥 ( Jeong Byeong Og ),정석진 ( Jeong Seog Jin ),이경원 ( Lee Gyeong Won ) 한국키틴키토산학회 2004 한국키틴키토산학회지 Vol.9 No.1
Chitosan has been used as a new material due to its outstanding performance. To overcome the disadvantage of chitosan such as low water solubility and to expand its application, a derivative of chitosan was prepared grafting N,N-dimethylacrylamide on the amino groups of chitosan. The deacetylation degree of chitosan was 98.7%. The water-soluble chitosan used as an emulsifier showed the viscosity-average molecular welght of 7.93×10(6). Fourier transform infrared(FT-IR) spectroscopy and H-NMR were used to confirm the synthesis of N,N-dimethylacrylamide grafted chitosan (DMAACs). Results for emulsifying agent using the perfectly stabilized beyond the concentration of 0.14 (w/v)%. In the homogenized time of 20 sec at 11,000 rpm. In addition, the emulsion was stabilized at storage temperature between 25 and 65˚C. Thus, the DMAACs can be used as an effective emulsifier and its emulsion can be applied to a W/O typed surfactant.
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Carboxyalkyl chitosan 유도체의 금속이온 흡착 특성
이배훈 ( Lee Bae Hun ),정병옥 ( Jeong Byeong Og ),노인섭 ( No In Seob ),손태일 ( Son Tae Il ),손영숙 ( Son Yeong Sug ),김천호 ( Kim Cheon Ho ) 한국키틴키토산학회 2004 한국키틴키토산학회지 Vol.9 No.1
Novel carboxyalkyl chitosan derivatives with n-propyl, n-butyl groups were prepared by reacting chitosan with 4-chlorobutyric acid and 5-chlorovaleric acid. The structural changes in the samples were confirmed by using elementary analysis, and FT-IR. The chelating abilities of chitosan and carboxyalkyI chitosan derivatives for metal ions (Cu(2+), Ca(2+), Mg(2+), and K(+)) were investigated by the batch method. The adsorptivity of carboxyalkyI chitosan derivatives at pH9 was almost the same at pH 6. The carboxyalkyI chitosan derivatives showed improved metal ion adsorption performances compared to chitosan. The chelating ability of carboxyalkyI chitosan derivatives increased with an increating in the chain length of the alkyI substitutes.
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