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[Oral Session 6] PLASTICIZATION AND BIODEGRADATION OF CELLULOSE ACETATE
Y.Matsubayashi,M.Ishizaki,Y.Sugihara,T.Tsuno 한국펄프·종이공학회 1999 한국펄프종이학회 기타 간행물 Vol.- No.-
The study of biodegradable low-molecular-weight aliphatic polyesters as a plasticizer for cellulose acetate(CA), with a degree of substitution(DS) of 2.5, was conducted. A series of biodegradable low-molecular-weight aliphatic polyesters (MW=670 to 2900) consisting of dicarboxylic acids and diols was synthesized in this research. The plasticized CA' s were prepared first by dry blending using a high-speed mixer, and then through melt compounding by a kneader. The molecular weight effect of low-molecular-weight aliphatic polyesters as a plasticizer was not evident on mechanical properties but on melt compounding, With regard to mechanical properties poly(ethylene succinate) was a particularly suitable plasticizer for CA although other aliphatic polyesters studied in this research were also miscible with CA. The biodegradation and GPC studies of plasticized CA' s indicated that the weight loss of low-molecular-weight aliphatic polyesters was much faster than that of CA.
Preparation of ZnS:Mn2+ and Other Sulpher Compound Nanoparticles by Using a Ball-Milling Method
S. Hamaguchi,S. Ishizaki,M. Kobayashi 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
ZnS:Mn2+ nanoparticles and other sulpher-based ternary compound nanoparticles were achieved using a ball-milling method. Several-nanometer-sized ZnS:Mn2+ nanoparticles were achieved by comminuting materials in a solvent. Both X-ray diffraction (XRD) and transmission electron microscopy (TEM) suggested that the particles had been milled down to the nanometer size. TEMenergy- dispersive X-ray spectroscopy (TEM-EDX) suggested that the stoichiometry of the starting powder was not affected by the ball-milling process. The orange-colored luminescence originating from Mn2+ was improved by reducing the particle size to several nanometers. Red, green and blue (RGB) colored phosphors were also studied using this technique. Ba2ZnS3:Mn (Red), SrGa2S4:Eu (Green), BaAl2S4:Eu (Blue) and phosphor materials with sizes of about several micrometers were comminuted to nanoparticles without affecting the crystal structure and the stoichiometry. Bright red, green and blue luminescence were confirmed from those nanoparticles.
Particle size effect of LiAlSiO₄on the thermal expansion of SiC porous materials
I. Juárez-Ramírez,K. Matsumaru,K. Ishizaki,L.M. Torres-Martínez 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.5
This paper reports the effect of the particle size of LiAlSiO4 on the thermal expansion and Young’s modulus of low thermal expansion (LTE) coefficient of porous materials using silicon carbide (SiC), vitrified bonding material (VBM) and lithium aluminum silicate (LiAlSiO4) at 850 oC. According to the XRD results, there is no reaction between the raw materials during the sintering process. SEM analysis revealed the presence of an internal porous structure with a pore size less than 4 micrometers. It was found that decreasing the particle size of LiAlSiO4 by almost 4 times reduces the porosity, keeping a low thermal expansion coefficient, but the Young’s modulus increases 50%. This paper reports the effect of the particle size of LiAlSiO4 on the thermal expansion and Young’s modulus of low thermal expansion (LTE) coefficient of porous materials using silicon carbide (SiC), vitrified bonding material (VBM) and lithium aluminum silicate (LiAlSiO4) at 850 oC. According to the XRD results, there is no reaction between the raw materials during the sintering process. SEM analysis revealed the presence of an internal porous structure with a pore size less than 4 micrometers. It was found that decreasing the particle size of LiAlSiO4 by almost 4 times reduces the porosity, keeping a low thermal expansion coefficient, but the Young’s modulus increases 50%.