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박병기,한태희,정용식,Park Pyong-Ki,Han Tae-Hui,Chung Yong-Sik 한국섬유공학회 2006 한국섬유공학회지 Vol.43 No.2
The Hanji treated with citric acid as crosslinking agent was prepared to improve wet dimensional stability and wet-strength. To improve dyeability for direct and reactive dyes, various concentrations of chitosan were added in crosslinking process. The wet dimensional stability and wet-strength of crosslinked Hanji were improved by citric acid addition, whereas the folding endurance significantly decreased. As the concentration of citric acid increased, K/S values of the crosslinked Hanji for berberin increased, but those direct and reactive dyes decreased. However, the dye adsorption for direct dye and reactive dye were improved by chitosan addition.
신혜경,정용식,박병기,이효진,김의화,Shin, Hye-Kyoung,Chung, Yong-Sik,Park, Pyong-Ki,Lee, Hyo-Jin,Kim, Eui-Hwa 한국섬유공학회 2006 한국섬유공학회지 Vol.43 No.6
Chitosan is the second abundant natural polymer after cellulose and shows a lot of potential functional advantages such as biodegradability, biocompatibility, antimicrobial properties etc. Cotton knit/chitosan sponge composite structures were prepared by coating chitosan solutions ($CH_3COOH$, HCI) onto the cotton knit fabrics, freezing at $-80^{\circ}C$, and Iyophilizing. Chitosan in two kinds of salts solutions was crosslinked with glutaraldehyde and citric acid prior to coating. Knit/chitosan sponge structures were transformed into the hydrogel structure when they absorbed water. 2% chitosan acetate composite crosslinked with citric acid absorbed water about 23 times of its dry weight. Weak physical properties of Iyophilized chitosan sponge were improved by forming knit/chitosan composite structure.
Hydroxyapatite 나노입자 함량에 따른 나노 Hydroxyapatite/키토산 복합체 필름의 특성
최충열,김현철,김수봉,박병기,정용식,Choi Choong-Youl,Kim Hyun-Chul,Kim Su-Bong,Park Pyong-Ki,Chung Yong-Sik 한국섬유공학회 2005 한국섬유공학회지 Vol.42 No.4
We investigated the effect of hydroxyapatite(HAp) nanoparticle content on the characteristics of HAp/chitosan composite film containing $50 wt.\%$ citric acid based on HAp content. Several compositions of HAp/chitosan composite films were prepared by co-precipitation and solvent casting method. According to turbidity measurements, HAp particles whose diameter were generally less than 500nm were homogeneously dispersed in chitosan matrix and all the films were transparent. HAp/chitosan composite films were characterized by X-ray diffractometer(XRD) and differential scanning calorimetry(DSC). The degree of swelling decreased with decreasing chitosan content. Tensile strength and modulus revealed that HAp/chitosan films became rigid and brittle with increasing HAp content. The increase of surface energy was due to the increasing interaction among the HAp nanoparticle, citric acid, and chitosan.