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설수덕,신동욱 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.1
The particle formation of iron oxide pigment by means of aerial oxidative precipitation from aqueous solution of ferrous sulfate with KOH, NaOH, Na_2 CO_3 and K_2 CO_3as a precipitants have been studies on the same oxidation condition. Submicron of needle-like yellow iron oxide(α-oxyhydroxide) particle was obtained from all kinds of precipitants and the average particle length from carbonate(K_2 CO_3 and Na_2 CO_3) as precipitant was about 1.5 times longer than the other bicarbonate precipitants. The kinetics of particle growth of iron oxide from aqueous solution of ferrous sulfate with KOH as precipitant have been studied. The influence of air flow rate, reaction temperature and initial mole ratio, R_o= [Fe^2+]_o/[OH]_o, value on the kinetics of particle growth are investigated by static pH experiment. The results show that the increase of air flow rate, reaction temperature and initial mole ratio, R_o value increases the oxidation rate through the particle growth. The activation energy of particle growth is 16.16KJ/mol and The oxidation reaction of seed formation is apparently first-order.
회분식반응기에서 스티렌과 알킬아크릴레이트의 공중합의 속도론
설수덕,김남석,황준호,최경선,강현석 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.1
Stylene(St) with Methyl Acrylate(MA), Ethyl Acrylate(EA), and n-Butyl Acrylate(BA) were carried out with benzoylperoxide(BPO) in touene. The copolymer compositions were determined by Elemental Analyzer(EA). The monomer reactivity ratio, r1 and r2 were determined by both the Kelen-Tu¨do¨s method and Fineman-Ross method. The values of r1 and r2 for each monomer pair were as follows : r1(st)=0.57(0.68), r2(MA)=0.09(0.22). The φ factor of the copolymer over all St compositions ranged from 0.64 to 2.33 and increased with increasing St compositions. The copolymerization rates of each monomer pair were determined.
회분식반응기에서 무수말레인산과 알킬메타크릴레이트의 공중합(Ⅱ)
설수덕,황준호 東亞大學校 1998 東亞論叢 Vol.35 No.-
Radical conolymerization of maleic anhydride with methylmethacrylate, ethyl methucrylate, n-buty1 methacrylate was carried out in a batch reartor. Solvent and initiator used were n,n-dimethylformamide and AIBN, respectively. Reactor volume was 300 litters, polymerization time 10 hours and polymerization temperature 50∼90℃. The copolymerization conversions were analyzed by FT-IR, GC-MS, GPC, and confirmed by measuring the solid weights of copplymers obtained after evaporating solvent. The monomer reactivity ratios were determined by the Kelen-Tudos method The maximun copolymerization activation energies calculated using differential method was 4.07 koal/mol for MAh/MMA=0.1/0.9.
연속반응기(CSTR)에서 α-Methylstyrene과 Acrylonitrile의 용액공중합에 관한 연구
설수덕,신봉섭 동아대학교 공과대학 부설 한국자원개발연구소 1993 硏究報告 Vol.17 No.1
The solution copolymerization of α-methylstyrene(AMS) with acrylonitrile(AN) was carried out in a batch reactor and CSTR. Solvent and initiator was used toluene and benzoyl peroxide. The copolymer conversion was analyzed by measuring the solid weights of copolymers obtained after precipitating and filtration reactant. The copolymer composition was determined by elemental analyzer(EA). The monomer reactivity rations, r₁and r₂was determined by Fineman-Ross method : r₁=0.023, r₂=0.115.
CaCO_3/Poly ethyl methacrylate를 이용한 무독성 혼합라텍스의 개발
설수덕,이선룡,이내우 한국산업안전학회 2002 한국안전학회지 Vol.17 No.4
Core-shell polymers of inorganic/organic pair, which are consisted of both core and shell component, were synthesized by sequential emulsion polymerization using ethyl methacrylate (EMA) as a shell monomer and ammonium persulfate as initiator. We found that CaCO_3 core should be prepared by adding 2.0wt% SDBS(sodium dodecyl benzene sulfonate), CaCO_3 core/PEMA shell polymeriation was carried out on the surface of CaCO_3 particle during EMA shell polymerization in the core-shell polymer preparation. The structure of core-shell polymer were investigated by measuring the degree on decomposition of CaCO_3 by HCI solution, thermal decomposition of polymer composite on thermogravimetric analyzer, glass transition temperature on differential scanning calorimeter, and morphology using scanning electron microscope.
환경친화적인 무기/유기 Core-Shell의 제조에 관한 연구
설수덕,임재길,임종민,권재범,이내우 한국안전학회 2004 한국안전학회지 Vol.19 No.1
Composite particles using inorganic and organic chemicals were synthesized and the results of those reaction were compared to variation of temperature and agitation speed in presence of CaCO₃ which was adsorbed SDBS. Also the synthesises were optimized according to conversion rate of composite particles. In inorganic/organic core-shell composite particle polymerization, CaCO₃ adsorbed by 0.5wt% surfactant SDBS was prepared initially and then core CaCO₃ was encapsulated by sequential emulsion polymerization using MMA at the addition of APS 3.16X 10^(-3)mo1/L to minimize the coagulated PMMA particle itself during MMA shell polymerization. Encapsulated PMMA on CaCO₃ as inorganic/organic core-shell particles was verified by Fr-IR and DSC analysis. It was found that the CaCO₃ was very well encapsulated by PMMA as shell. The surfaces were distinctly found as spindle shape and broad particle distribution after capsulation.
薛秀德,韓丞完,金東建,文德柱 동아대학교 공과대학 부설 한국자원개발연구소 1988 硏究報告 Vol.12 No.2
The thermal degradation behavior of the homopolymer poly(methyl methacrylate) (PMMA) and styrene-co-acrylonitril (SAN) as well as their mixture were carried out using the thermogravimetric and infrared spectroscopy method in the stream of various gases. The activation energies evaluated by the reported various kinetics equations except PMMA80%-SAN20% Mixture agreed with each other very well. The thermal degradation of PMMA and SAN mixture were considered to be carried out by the main chain scission.
薛秀德,朴相郁 동아대학교 공과대학 부설 한국자원개발연구소 1986 硏究報告 Vol.10 No.2
The thermal decomposition of polyethyl methacrylate was studied using a dynamic thermogravimetry and viscometry techniques in the stream of nitrogen gas with 50ml/min at various heating rates form 230 to 290℃. The mathematical methods, Kissinger, Chatterjee-Conrad, Friedman, Second derivative, Horowitz-Metzger, Ozawa and Isothermal method were used to obtain valuse of activation energy of decomposition reaction. The activation energies evaluated by the above methods except Chatterjee-Conrad method agree with each other very well. The thermal degradation of polyethyl methacrylate was considered to be carried out by main chain scission and the thermogravimetric trace curve agreed with the theoretical equation.
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.
설수덕,왕석주,장성호 동아대학교 환경문제연구소 1994 硏究報告 Vol.17 No.2
The thermal decomposition of the sludge with Poly(acryloniti1e-butadiene-styrene) and Poly(styrene-co-acrylonitrile) were using a thermal analysis techniques in the stream of nitrogen gas of 30ml/min at various heating rates from 4 to 20℃/min. The mathematical, Derivative and Integral method were used to obtained values of activation energy of decomposition reaction. 1. The values of activation energy evaluated by Derivative and Intergral method were consistent with each other very well. 2. The maximum value of heat of decomposition evaluated by DSC method were 10, 120 cal/g at weight ratio of sludge/ABS=20/80 and 10, 500cal/g at weight ratio of sludge/SAN = 20/80. 3. The thermogravimetric trace curve agreed with the theoretical equation.