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강세미,노창환,황대연,정영진,최해욱,이언필,이재호,Kang, Se-Mi,Noh, Chang-Hwan,Hwang, Dae-Youn,Jung, Young-Jin,Choi, Hae-Wook,Lee, Eon-Pil,Lee, Jae-Ho 한국섬유공학회 2012 한국섬유공학회지 Vol.49 No.1
The uncrosslinked and crosslinked by ethylene glycol diglycidyl(EGDE) chitosan/sericin blend films were prepared by solvent blending method. Physicochemical properties of the prepared blend films according to various blend ratios were investigated. This was carried out by using universal testing machine, thermogravimeter(TGA), differential scanning calorimeter(DSC), wide angle X-ray diffractometer(WAXD), Fourier transform infrared spectrum(FTIR) and scanning electron microscopy(SEM). With an increase in the sericin mixing ratio, tensile stress increased whereas the tensile strain decreased for uncrosslinking blend films. For a cross linked chitosan/sericin blend film by EGDE, both the tensile stress and strain decreased. Chitosan/sericin blend films exhibit an excellent thermal stability when sericin mixing ratio is 25%. In the infrared spectra, chitosan/sericin blend films showed an absorption band of amide I peak at 1630 $cm^{-1}$ and it is concerned with C=O stretching vibration by strong hydrogen-bond between inter-molecular. These also showed an absorption band of amide II peak at 1521 $cm^{-1}$ concerned with N-H bending vibration. The absorption band of amide I peak decreased with an increase in the chitosan mixing ratio. We identified that there was good miscibility between chitosan and sericin. The water-retention values(WRV) of chitosan/sericin blend films increase as the amount of sericin is raised and this owes to the hydrophilic nature of sericin. Weight loss of the citosan/sericin blend films by cleaning with an aqueous sodium hydroxide increased with an increase in the sericin mixing ratio. This loss is the loss of acetic acid and sericin in the chitosan/sericin blend films and this is because of the molecular weight of the sericin is 1/5 of the chitosan and sericin is dissolved into NaOH solution. Weight loss increased when sericin content was more than 50% for the cross linked chitosan/sericin blend films. From the structure analysis, we identified that there was good miscibility and strong intermolecular interaction between the chitosan molecules that resulted from intermolecular hydrogen bonds.
이재호,노창환,최해욱,정영진,황대연,이언필,Lee, Jae-Ho,Noh, Chang-Hwan,Choi, Hae-Wook,Jung, Young-Jin,Hwang, Dae-Youn,Lee, Eon-Pil 한국섬유공학회 2010 한국섬유공학회지 Vol.47 No.2
Chitosan/poly(vinyl alcohol)(PVA) blend films with non-toxicity, biodegradability, and biocompatibility were prepared by solvent blending method. The weight composition ratios of chitosan/PVA blend films were 100/0 (chitosan homopolymer), 75/25, 50/50, 25/75, and 0/100 (PVA homopolymer). Physicochemical properties of the prepared blend films according to various blend ratios were investigated by using universal testing machine, thermogravimeter (TGA), differential scanning calorimeter (DSC), wide angle X-ray diffractometer (WAXD), Fourier transform infrared (FTIR) spectrometer, and scanning electron microscope (SEM). The tensile stress and tensile strain of chitosan/PVA blend films increased as the amount of PVA increased. The thermal stability increased with increasing chitosan content in the chitosan/PVA blend films. The DSC curve of the PVA film shows an endotherm peak around $230^{\circ}C$, and the peak became smaller and broader with increasing chitosan content. The diffraction intensities of chitosan observed at 2 theta of $10^{\circ}$ decreased with increasing the content of PVA in the blend films, but the crystal intensities of the blend films increased as the amount of PVA increased. In the infrared spectra, the absorption band for -OH and -NH stretching vibrations in chitosan broadened and shifted obviously to lower wavenumber with the increase of PVA. Water-retention values of the chitosan/PVA blend films increased as the amount of PVA is increased owing to the hydrophilic nature of PVA. From the structural analyses, it is believed that chitosan and PVA are miscible due to the strong intermolecular hydrogen bonding.