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( Dam-hee Lee ),( Xiang Xu Li ),( Ur-ryong Cho ) 한국고무학회 2018 엘라스토머 및 콤포지트 Vol.53 No.3
Solution-styrene-butadiene rubber (SSBR) composites were manufactured using four kinds of fillers: silicasilane coated carbon black (SC-CB) hybrid, starch-SC-CB hybrid, pure silica, and pure starch. The influence of filler type on the mechanical properties of the rubber matrix was studied in this work. SC-CB was prepared by silane-graft-coating using vinyl triethoxy silane and carbon black, which enhanced the dispersion effect between the rubber matrix and the filler, and improved the mechanical properties of the compounds. The morphology of the composites was observed by field-emission scanning electron microscopy (FE-SEM). The thermal decomposition behavior of the composites was determined by thermogravimetric analysis (TGA), and the crosslinking behavior of the composites was tested using a rubber process analyzer (RPA). The hardness, tensile strength, swelling ratio, and gas transmittance rate of the composites were evaluated according to ASTM. The test results revealed that with the addition of SC-CB, the hybrid fillers, especially those blended with silica, showed a better reinforcement effect, the highest hardness and tensile strength, and stable thermal decomposition behavior. This implies that the silica-SC-CB hybrid filler has a notable mechanical reinforcement effect on the SSBR matrix. Because of self-crosslinking during its synthesis, the starch-SC-CB hybrid filler produced the most dense matrix, which improved the anti-gas transmittance property. The composites with the hybrid fillers had better anti-swelling properties as compared to the neat SSBR composite, which was due to the hydrophilicity of silica and starch.
Inhibitory Effects of Thymol Isolated from Curcuma longa L. on Adipogenesis in HepG2 Cells
Dam Hee Kang(강담희),Young Seob Lee(이영섭),Seon Min Oh(오선민),Da Hye Yoon(윤다혜),Doo Jin Choi(최두진),Dae Young Lee(이대영),Kyung Sook Han(한경숙),Geum Soog Kim(김금숙),Dong Hwi Kim(김동휘),Dong Yeul Kwon(권동열),Ok Hwa Kang(강옥 한국약용작물학회 2020 한국약용작물학회 학술대회논문집 Vol.2020 No.1
A Study on Properties of SSBR/NdBR Rubber Composites Reinforced by Silica
( Dam-hee Lee ),( Xiang Xu Li ),( Ur-ryong Cho ) 한국고무학회 2018 엘라스토머 및 콤포지트 Vol.53 No.4
Five solution styrene butadiene rubber/neodymium butadiene rubber (SSBR/NdBR) composites were manufactured using different ratios of SSBR and NdBR. In this study, the composites were reinforced with NdBR and silica to confirm the physical properties of SSBR used for treads of automobile tires and the dispersibility with silica. The morphologies of the rubber composites were observed using field-emission scanning electron microscopy (FE-SEM). The crosslinking behaviors of the composites were tested using a rubber process analyzer (RPA), and the abrasion resistances were tested using a National Bureau of Standards (NBS) abrasion tester. The hardness values, tensile strengths, and cold resistances of the composites were also tested according to ASTM standards. Increased NdBR content yielded composites with excellent crosslinking properties, abrasion resistances, hardnesses, tensile strengths, and cold resistances. The crosslinking point increased due to the double bond in NdBR, thereby increasing the degree of crosslinking in the composites. The NdBR-reinforced composites exhibited excellent abrasion resistances, which is explained as follows. In SSBR, a breakage is permanent because a resonance structure between styrene and SSBR forms when the molecular backbone is broken during the abrasion process. However, NdBR forms an additional crosslink due to the breakdown of the molecular backbone and high reactivity of the radicals produced. In addition, the low glass transition temperature (Tg) of NdBR provided the rubber composites with excellent cold resistances.
Effects of Saenghyul-dan (SHD) on the Myelosuppression Induced by 5-Fluorouracil
Lee, Gi-Joon,Son, Chang-Gue,Lee, Yeon-Weol,Lee, Nam-Heon,Yun, Dam-Hee,Yoo, Hwa-Seung,Cho, Chong-Kwan,Cho, Jung-Hyo The Society of Korean Medicine 2006 대한한의학회지 Vol.27 No.4
Objective : This study aimed to investigate the effect of SHD on myelosuppression using an animal model for therapeutic evidence supporting clinical positive results. Methods : After determining the optimal concentration of 5-FU as 300 mg/kg for developing the mouse model, ICR mice or BALB/c mice were administered with SHD, and several blood parameters, including hematopoietic cytokines, colony forming activity and histological findings, were examined to evaluate the effects. Results : SHD restored the WBC and hemoglobin, and showed effects on maintaining body weight, producing GM-CSF and IL-3 and stem cell colony forming activity in accordance with histological relative entirety on bone marrow. Conclusion : SHD is an herbal drug having therapeutic effects on myelosuppression. Thus, it could be prescribed to cancer patients undergoing chemo-therapies or radio-therapies in the process of cancer treatment.