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측쇄에 전 방향족 올리고 아미드를 가지는 고분자의 합성 및 그 열적 성질
전승범,박원호,하완식,Jeon, Seung-Beom,Park, Won-Ho,Ha, Wan-Sik 한국섬유공학회 1988 한국섬유공학회지 Vol.25 No.1
New polymers which have wholly aromatic oligoamides as side chains were synthesized. Poly(N-phenyl acrylamide) (PPA) and poly(N-acryloyl-$\rho$-aminobenzanilide) (PBA) were prepared by the reaction of poly(acrylor chloride) with aniline and $\rho$-aminobenzanilide, respectively. The thermal properties of both polymers were examined by differnetial scanning calorimetry and thermogravimetry. It was found that PPA and PBA were in partly crystalline form, but no melting point could be detected. The Thermal property of the polymers was superior to that of poly(acrylic acid).
표면처리온도에 대한 Alkylsilane 자기조립분자막의 트라이볼로지적 특성 연구
김용식(Yong-Sik Kim),김대은(Dae-Eun Kim),전승범(Seung-Beom Jeon) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.36 No.-
In this work, the effects of the surface treatment temperature on the tribological characteristics of Alkylsilane-based Self-Assembled Monolayers(SAMs) were investigated. Numerous studies on SAMs have been performed for the stiction/friction reduction for microsystem parts, since they have low surface energy and the merits of forming ultrathin films with low cost. In order to apply SAMs as a lubricant for micro-parts more effectively, the tribological behaviors of SAMs under various environmental conditions should be investigated since micro-parts might be operated or handled under severe conditions such as high temperature and pressure. From the experimental results, it was found that DDMS(Dichlorodimethylsilane) monolayer has better stability compared with OTS(Octadecyltrichlorosilane) SAM regardless of surface treatment temperature, even though both monolayer coated surfaces treated under the temperature of 300℃ showed similar stiction/friction characteristics.
이권용(Kwon-Yong Lee),정일영(Il-Young Jung),박성호(Sung-Ho Park),전승범(Seung-Beom Jeon) 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.35 No.-
Dental chewing masticator, which is an essential device for evaluating the wear of dental resin and the interfacial failure between the filling resin and enamel of tooth used in conservative dentistry, was developed. This dental chewing masticator mimics the chewing motion and loading by adapting DC motor and rotary cam system. Chewing loading of 49N was imposed by computer-displacement control, loadcell, LM guide, and spring system. Extracted tooth was fixed into a holding jig, and this jig was mounted with rubber pad on the 15°inclined surface to consider the lateral movement of periodontal ligament. A water bath was installed for providing the environment of inside mouth and for circulating the 5℃-55℃ water to evaluate the effect of hydrothermal cycling on the damage of resin filled teeth during long-term chewing activity.
Halogen Light Curing Unit과 Light Emitting Diodes Curing Unit을 이용하여 중합되어진 복합레진의 마멸 특성 비교
김환(Hwan Kim),이권용(Kwon-Yong Lee),박성호(Sung-Ho Park),정일영(Il-Young Jung),전승범(Seung-Beom Jeon) 한국트라이볼로지학회 2005 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.21 No.6
In this study, the wear characteristics of five different dental composite resins cured by conventional halogen light and LED light sources were investigated. Five different dental composite resins of Surefil, Z100, Dyract AP, Fuji Ⅱ LC and Compoglass were worn against a zirconia ceramic ball using a pin-on-disk type wear tester with 15 N contact force in a reciprocal sliding motion of sliding distance of 10 mm/cycle at 1 Hz under the room temperature dry condition. The wear variations of dental composite resins were linearly increased as the number of cycles increased. It was observed that the wear resistances of these specimens were in the order of Dyract AP > Surefil > Compoglass > Z100 > Fuji Ⅱ LC. On the morphological observations by SEM, the large crack formation on the sliding track of Fuji Ⅱ LC specimen was the greatest among all resin composites. Dyract AP showed less wear with few surface damage. There is no significant difference in wear performance between conventional halogen light curing and light emitting diodes curing sources. It indicates that a light emitting diodes (LED) source can replace a halogen light source as curing unit for composite resin restorations.
김환(Hwan Kim),이권용(Kwon-Yong Lee),박성호(Sung-Ho Park),정일영(Il-Young Jung),전승범(Seung-Beom Jeon) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.36 No.-
The wear characteristics and wear mechanisms of dental composite resins were investigated. Six different composite resins including the traditional material of Amalgam were tested and compared each other. All wear tests were preformed by pin-on-disk type machine operating in a reciprocal sliding motion. Morphology of worn surfaces were observed by Microscope. Experimental results indicated that the wear resistances of these specimens were in the order of Dyract AP<Surefil1<Compoglass<Amalgam<Zloo<FujiⅡLC<Surefil2. The main wear mechanism was found to be plastic flow and abrasive wear by failure of fillers from matrix.