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Kim, Ohyoung,Han, Sanghyuk 한국공업화학회 2004 Journal of Industrial and Engineering Chemistry Vol.10 No.3
Hybrid-filled polymeric dental restorative composites (PDRC) were prepared using a visible light activation system. The resin matrix system of the PDRC that we adopted in this study was 2,2'-bis-[4-(3-methacryloxy-2-hydroxypropoxy)phenyl]propane diluted with triethyleneglycol dimethacrylate andor urethane dimethacrylate (UDMA). The hybrid-filler system was used as an inorganic filler component in the composite. To improve the dispersibility of the hybrid-filler in the PDRC, the filler's surface was coupled hydrophobically with a silane compound. In the present study, we investigated the effect of UDMA diluent on the mechanical properties of the PDRC by measuring the values of the diametral tensile strength, flexural strength, and flexural modulus. A scanning electron microscopy study indicated the superior surface characteristics of the PDRC product we prepared.
Fluorescent Polyurethane Foams Containing Red Fluorescent Perylene Chromophore
Kim, Ohyoung,Gong, Myoung-Seon 한국공업화학회 2004 Journal of Industrial and Engineering Chemistry Vol.10 No.5
Reactive red fluorescent dyes based on perylene tetracarboxylic diimide were prepared by reaction of 1,6,7,12-tetraphenoxy-3,4,9,10-perylenetetracarboxy anhydride with various alkyl amines and their application to the coloration of polyurethane foams was performed. Fluorescent polyurethane foams were prepared by the reaction of dye-dispersed polyol resin with 4,4'-methylenebis(phenyl isocyanate) in the presence of a blowing agent. The degree of fluorescence of the resulting polyurethane foam is dependent upon the chemical structure of the dye molecule and also it is a function of the solubility of the dye within the monomeric polyol solution.
Kim, Ohyoung 한국공업화학회 2005 Journal of Industrial and Engineering Chemistry Vol.11 No.2
The aim of this research was to investigate the influence of the photoaccelerator on the polymerization behavior of light-activated polymeric dental restorative composites (PDRC) cured using a visible-light system. A variety of aliphatic or aromatic amines were adopted as the photoaccelerator and their contents were varied from 0.2 to 3.0 wt% based on the 2,2'-bis-[4-(3-methacryloxy-2-hydroxypropoxy)phenyl]propane/triethyleneglycol dimethacrylate (70/30 wt/wt%) resin matrix. The effects that the photoaccelerator content and the chemical structure had on the polymerization behavior of PDRC were characterized. For each photo-accelerator under investigation, the degree of conversion (DC) appeared to reach a maximum at 1.0~1.2 wt%; there was no prominent photoaccelerator effect on the depth of cure. Additionally, the trend of the dependence of photoaccelerator on the PDRC's polymerization shrinkage was consistent with DC results.
Kim, Ohyoung,Chun, Jiyoun,Kim, Yongwoon,Shim, W. Jaewoo 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.6
Preparation of polymeric dental restorative materials (PDRM) showing a lower polymerization shrinkage was carried out using the hybrid-filler and 2,2'-bis-[4-(3-methacryloxy-2-hydroxypropoxy) phenyl]propane resin matrix that is diluted with a high molecular weight dimethacrylate monomer. A visible light system was utilized to activate the resin matrix for the polymerization. In order to enhance the miscibility of the inorganic hybrid-filler with organic resin matrix and to conduct the homogeneity of the filler in the PDRM, its surface was hydrophobically treated with y -methacryloxypropyltrimethoxysilane. The degree of conversion (DC), depth of cure, and polymerization shrinkage of the PDRM were investigated. The results revealed that PDRM prepared herein showed markedly lower polymerization shrinkage values. Besides, regardless of the filler loading, both DC and depth of cure values decreased with an increase in the amount of less flexible diluent in the resin matrix.
김오영,한상혁,김용운,김원희,오명환 한국공업화학회 2003 응용화학 Vol.7 No.2
Effect of camphorquinone (CQ) photoinitiator on the dental properties of polymeric dental restorative composites (PDRC) was investigated. The surface of the barium silicate filler (avg. diameter 1μm) was treated with γ-methacryloxypropyl-trimethoxysilanc to improve the interfacial behavior between the resin matrix and filler. A visible light system was utilized to activate the resin matrix in PDRC and the contents of CQ were varied from 0.1 to 1.0 wt% based on 2.2'-bis-[4-(3-methacryloxy-2-hydroxypropoxy)phenyl]propane/triethyleneglycoldimethacrvlate (70/30 wt%/wt%) resin matrix. From the experimental results, it was discovered that the PDRC prepared using 0.5 wt% of CQ based on the resin matrix resulted in the finest dental properties.
Kim, Ohyoung,Kim, Yongwoon,Han, Sanghyuk,Youn, Myungsup 한국공업화학회 2003 응용화학 Vol.7 No.2
Polymeric dental restorative composites (PDRC) containing urethane dimethacrylate was prepared using the visible light activation system. The resin matrix system of PDRC was 2,2'-bis-[4-(3-methacryloxy-2-hydroxypropoxy)phenyl]propane diluted with triethyleneglcoldimethacrylate and/or urethane dimethacrylate(UDMA). The hybrid-filler system was used as an filler component. To improve the dispersibility of the filler in the PDRC, its surface was hydrophobically coupled with silane compound. In the present study, effect of UDMA diluent on the mechanical properties of the PDRC was investigated by measuring the diametral tensile strength, flexural strength, and flexural modulus values. Scanning electron microscopy study indicated the superior surface characteristics of PDRC product prepared herein.
Kim, Ohyoung 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.4
The purpose of this study was to investigate the effect of camphorquinone (CQ) photo-initiator on the dental properties of visible light-activated polymeric dental restorative composites. The contents of CQ were varied as 0.1, 0.3, 0.5, 0.6, 0.8, and 1.0 wt% based on bisphenol-A glycerolate dimethacrylate/ triethyleneglycol dimethacrylate (80/20 wt%/wt%) resin matrix. Silanized barium silicate (75 wt% of com-posite) and ethyl-4-dimethylaminobenzoate (1.O wt% of resin matrix) were used as a filler and reducing agent for CQ, respectively. Effect of the CQ content on the polymerization behavior was observed by measuring the depth of cure and the degree of conversion using a Fourier transform infra-red spectroscopy. In addition, color variation of the composite materials was investigated by measuring the Hunter L, a, b values using a chromometer. Finally, mechanical properties including diametral tensile strength, flexural strength, and flexural modulus of the light-cured polymeric dental restoratives were also investigated.