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Polyurethane 탄성체의 합성과 물성에 관한 연구
유종선,백남철,윤정식 한국고무학회 1990 엘라스토머 및 콤포지트 Vol.25 No.1
The purpose of this study is to estabilish the synthetic condition of polyurhethane elastomer for excellent properties. Polyurethane elastomer which have different NCO percentage and hard segment contents was synthesized by casting method. And the effects of hard segment contents were investigated by analytical methods such as IR, DSC, etc. [NCO]/[OH] ratio was proper at the range 1.02∼1.05. By IR absorption peak(1250㎝^(-1)) which indicate interurethane hydrogen bond it was confirmed that hard segment were crystallized. Melting point that was determined by DSC showed the effects of hard segment contents, phase mixing and crystalline size.
화학처리 Silica 의 SBR 에 대한 보강효과에 관한 연구
유종선,최세영,박건록 한국고무학회 1994 엘라스토머 및 콤포지트 Vol.29 No.1
The purpose of this study is to investigate reinforced effect between silica treated by coupling agents and rubber matrix under the configuration chemical bonds, and the effect of silica particles coated by organic polymers using aluminum chloride as the catalyst. In vulcanization characteristics were tested by Curastometer. The M-series vulcanizates were reached to the fastest optimum cure time(t_(90)) and R-series vulcanizates with the same formula had the shorted optimum cure times. Tensile characteristics measuring with a tensile tester revealed that the M-series vulcanizate was the best in the physical properties, such as tensile strength. In 100% modulus, however, the S-series vulcanizates appeared to be better than the other vulcanizates. Also, hardness showed the following order : S-series$gt;R-series$gt;M-series with the order of elongation R-series$gt;M-series$gt;S-series. In SEM test, shapes of chemical treated silicas were observed. The dispersion of filler in the SBR composite appeard uniformly. In RDS test for the dynamic characteristics, G' indicates that S-3 shows the highest value with the next order M-3$gt;R-3, and the order of damping values are as follows : S-3$gt;M-3$gt;R-3.
Silane Coupling 제와 고분자탄성체간의 용액반응에 대한 속도론적 해석
유종선,박영수,백남철,윤정식 한국고무학회 1990 엘라스토머 및 콤포지트 Vol.25 No.2
In this study, as one way of developing the new cross-linking method that is curable in water, kinetic analysis of solution reaction between CR and silane coupling agents was attemped. First, CR was reacted with silane coupling agents in solution state. According to the time, reaction quantity was pursued by gas chromatography. Also, reaction rate coefficient and activation energy were calculated from the reaction quantity. Silane coupling agents which were used in this study were MPS, CPS and VES.
Silica와 Glass Fiber에 의한 Polychloroprene의 보강
유종선,백남철 한국고무학회 1988 엘라스토머 및 콤포지트 Vol.23 No.3
The effect of triazine thiol derivative on the physical properties of silica-polychloroprene(CR) composites and glass fiber(MGF)-CR composites was investigated. Optimum cure time of the MGF composites filled with 2-dibuthylamino-4, 6-dithiol-s-triazine(DBT) was the fastest one, while maximum torque was the best in case of the silica composites filled with s-triazine-2,4,6-trithiol(TAT) on the Oscillating Disk Rheometer(ODR) test. Stress-strain curves of the composites showed that the physical properties such as 100 modulus, 300% modulus, tensile strength of the silica composites filled with DBT was very satisfactory and the silica composites filled with TAT was higher density of crosslinking than other crosslinked elastomer. In aging properties, elastomer filled DBT and TAT were progress post-curing reaction with increasing of aging time and it have been improved the tensile strength and crosslinking density.
Triazine Thiol 유도체에 의한 1-Chlorobutadiene - Butadiene Copolymer 의 안정화효과에 관한 연구
유종선,백남철,산하진삼 한국고무학회 1987 엘라스토머 및 콤포지트 Vol.22 No.2
In this study, as one of the developing ways of the functional elastomer, improvement of the functionality of CB-BR was attemped through stabilization. At first the stabilization effect of CB-BR and the concentration dependancy in CBBR were determined. Then, triazine thiol derivative(BPTT) was synthesized by reacting p-aminodiphenylamine with cyanuric chloride. Further the functional mechanism and the effects of the antioxidants were investigated using BPTT together with other various antioxidants in liquid and solid states. The results obtained are as follows: 1) The aging of CB-BR depended on the concentration and temperature. Thus, at a low temperature of 50℃, the aging proceeded with gel formation; at high temperature above 100℃ and in above 4wt% concentration, the aging occured by the formation of gel. And in concentrations below that, the aging proceeds with a decomposition caused by oxygen attacked to elastomer molecules. 2) The effect of antioxidation of CB-BR in the liquid state was at it's best when the MBIZ and BPTT were used at 110C, 4hrs after the oxidation. 3) The effect of antioxidation of CB-BR in the solid state was the best choice the simultaneous use of NDBC and BPTT at 50℃, 30days after the oxidation.