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설수덕,이내우 동아대학교 환경문제연구소 1998 硏究報告 Vol.21 No.2
The thermal decomposition of low density polyethylene(LDPE) and 25%~48% chlorinated polyethylene(CPE) were studied using a dynamic thermogravimetry in the stream of nitrogen gas with 20ml/min. The mathematic method, differential (Friedman) and Integral (Ozawa) method were used to obtain value of activation energy of decomposition energy on the reaction. The activation energies evaluated by the above methods agree with each other very well. The average activation energy calculated was 71.72kcal/mol. The thermal decomposition of LDPE and CPE were carried out by main chain scission and the thermogravimetric trace curve agree with the theoretical equation.
회분식 반응기에서 α- Methylstyrene과 Acrylonitrile의 공중합과 열분해 속도에 관한 연구
설수덕,김남석 동아대학교 공과대학 부설 한국자원개발연구소 1993 硏究報告 Vol.17 No.2
Radical copolymerization of α-methylstyrene With acrylonitrile was carried out in toluene and BPO by a batch reactor. Reaction volume was 0.5 litters, reaction time in a batch reactor 7 hours at 75℃~95℃. The copolymerization conversion were analyzed by GC ad EA, conformed by measuring the solid weights of copolymers obtained after evaporation solvent. The radical copolymerization with propagation and depropagation is presented in order to estimate reactivity ratio(r₁, r₂) and K₁₁(the equilibrium constant for propagation and depropagation) in the copolymerization of α-MS(M₁) and AN(M₂). The value of r₁, r₂, and K₁₁ are found to be 0.1251, 0.0577, and 23.8, respectively. Activity energy of copolymerization and thermal decomposition is 22~30, 52.2㎉/㏖ respectively.
아크릴로니트릴과 스티렌계 광공중합 반응속도에 관한 연구
설수덕,최경선 동아대학교 공과대학부설 생산기술연구소 1998 生産技術硏究所硏究論文集 Vol.3 No.1
The objective of this study is to investigate the kinetics of the photoinitiated(λ=365nm)copolymerization of acrylonitrile with styrene in the presence of Lewis acid and hydrogen donors-in and homogeneous reaction system at 25℃. From these experiment and discussions, we have the results as follows. 1. The reaction of AN-St successfully competes with the quenching of BP triplet by styrene. 2. The monomer reactivity ratio of AN-St was deterimined by Kelen-Tu¨do¨s method, reactivity ratios of n(AN), r₂(St), as 0.09, 0.59 respectively and their model is as follows. R_p=0.023[M]^0.48[I]^0.47[S]^0.62[H]^0.32exp^-1.38/RT
자성체용 α-Ferric oxyhydroxide의 핵성장반응속도론
설수덕,신동욱 동아대학교 공과대학부설 생산기술연구소 1998 生産技術硏究所硏究論文集 Vol.3 No.2
The kinetics of seed formation and growth of α-ferric oxyhydroxide with aerial oxidative precipitation from aqueous solution of ferrous sulfate with KOH,NaOH, Na_2 CO_3 as a precipitation have been studied by free pH drift experiment. It has been shown that all precipitants give same particle formation and growth path, and average particle length from KOH and NaOH as precipitant was shorter than that of K_2 CO_3 and Na_2 CO_3. The kinetics of α-ferric oxyhydroxide seed growth from aqueous solution of ferrous sulfate with KOH as a precipitant has been studied. The influence of air flow rate, reaction temperature and initial mole ratio, R_o=[Fe^2+]_o/[OH^-]_o, on the kinetics of seed growth are investigated by static pH experiment. The oxidation rate of seed growth increased with increasing air flow rate, reaction temperature and initial mole ratio. The activation energy of seed growth is 16.16 KJ/mol and rate equation of seed growth can be written as follows: -d[Fe^2+]/dt = 1.46×10⁴[P_O_2]^0.66[OH^-]^2.19exp(-16.16/RT)
설수덕,이순재 동아대학교 생산기술연구소 2000 生産技術硏究所硏究論文集 Vol.5 No.1
Grounding agent is produced of blend both anion surface active agent and nonion surface active agent in the lubricant mixed by oleic acid and diethanol amine. Conversion ratio is proportionate to the reaction temperature and the composition of diethanol amine in lubricant mixture and it is the highest to 98% that the mol ratio of oleic acid : diethanol amine is to 1:3. The diminishing ratio of raw silk has no relation with the composition of bath anion a nd nonion surface active agent in the material test of grounding agent. It is excellent when the mol ratio of oleic acid and diethanol amine is the same mol ratio. Whiteness ratio is nearly constant regardless the composition of lubricant. The size of strength and elongation and cutting numbers have the inverse proportion to the composition of diethanol amine in lubricant. Modulus ratio has no relation with the density of grounding agent and is the best in 2.5%.