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Polymerization of Methyl Methacrylate Initiated by Cobalt (II) Nitrate
이장우,이동호,안태완,Jang-oo Lee,Dong-ho Lee,Tae-oan Ahn Korean Chemical Society 1975 대한화학회지 Vol.19 No.6
Tetrahydrofuran(THF)중에서 질산코발트(II)를 개시제로 사용하여 methyl methacrylate(MMA)의 중합반응을 연구하였다. 반응속도론적 연구 결과로 다음과 같은 중합속도식을 얻었다. $R_p=k\;[질산코발트(II)]^{0.5}\;[MMA]^{1.5}$ Chelate를 잘 형성하는 옥살산이 중합속도에 미치는 영향을 고려해 보면, 단위체인 MMA가 질산코발트(II)와 배위착물을 형성한다는 것을 추론할 수 있었다. 또 중합계의 겉보기 총 활성화에너지는 14.0kcal/mole이라는 것을 알았다. The polymerization of methyl methacrylate(MMA) initiated by cobalt (II) nitrate in tetrahydrofuran (THF) has been studied. From the results of kinetic studies, the overall polymerization rate (Rp) could be expressed as following; $R_p=k\;[cobalt(Ⅱ)\;nitrate]^{0.5}\;[MMA]^{1.5}$ By considering the effects of chelating agent on the polymerization rate, it could be assumed that the monomer, MMA might form a coordination complex with cobalt(II) nitrate. In the presence of radical inhibitor hydroquinone, the inhibition time was observed. And the apparent overall activation energy was calculated to be 14.0 kcal/mole.
반고형제제의 유동특성에 관한 연구 (제1보) : 치약의 정상전단 유동거동
김정화,송기원,이장우,이치호,Kim, Jeong-Hwa,Song, Ki-Won,Lee, Jang-Oo,Lee, Chi-Ho 한국약제학회 1995 Journal of Pharmaceutical Investigation Vol.25 No.3
The steady shear flow properties of six kinds of commercial toothpastes were measured using a concentric cylinder type rheometer. In this paper, the shear rate and temperature dependencies of their flow behavior were investigated and the validity of the Casson and Herschel-Bulkley models was examined. Further, the flow properties over a wide temperature range were quantitatively evaluated by calculating the various material parameters. Main results obtained from this study can be summarized as follows: (1) Toothpastes are plastic fluids with a yield stress and their flow behavior shows shear-thinning characteristics. (2) With increasing temperature, the degree of shear-thinning becomes weaker and the Newtonian flow behavior occurs at a lower shear rate range. (3) The Herschel-Bulkley model is more effective than the Casson model in predicting their flow behavior. (4) As the temperature increases, the yield stress, plastic viscosity and consistency index become smaller, on the contrary, the flow behavior index becomes larger.
반고형제제의 유동특성에 관한 연구 ( 제1보 ) : 치약의 정상전단 유동거동
김정화,송기원,이장우,이치호 ( Jeong Hwa Kim,Ki Won Song,Jang Oo Lee,Chi Ho Lee ) 한국약제학회 1995 Journal of Pharmaceutical Investigation Vol.25 No.3
The steady shear flow properties of six kinds of commercial toothpastes were measured using a concentric cylinder type rheometer. In this paper, the shear rate and temperature dependencies of their flow behavior were investigated and the validity of the Casson and Herschel-Bulkley models was examined. Further, the flow properties over a wide temperature range were quantitatively evaluated by calculating the various material parameters. Main results obtained from this study can be summarized as follows: (1) Toothpastes are plastic fluids with a yield stress and their flow behavior shows shear-thinning characteristics. (2) With increasing temperature, the degree of shear-thinning becomes weaker and the Newtonian flow behavior occurs at a lower shear rate range. (3) The Herschel-Bulkley model is more effective than the Casson model in predicting their flow behavior. (4) As the temperature increases, the yield stress, plastic viscosity and consistency index become smaller, on the contrary, the flow behavior index becomes larger.