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설수덕 동아대학교 생산기술연구소 2006 生産技術硏究所硏究論文集 Vol.11 No.-
The core-shell composite particle binder is varied from a core-shell structure to a complete phase separation with various two phase structure in between, depending on polymerization sequence, polymerization methods, reaction condition, polymer compatibility, molecular weight of polymer, polymer phase ratio, etc. In this article we describe the acrylic core-shell latex polymerization process employed to build core-shell structure. The structures of these composite particles were observed by glass transition temperature by DSC, particle size analysis, and micrological observation by TEM photograph. Reagent grade Styrene (St), Methyl methacrylate (MMA), Ethyl acrylate (EA) was distilled at reduced pressure under N2 atmosphere. In this study, a technique of microwave excitation at atmospheric pressure plasma treatment was applied to various material to improve adhesive strength by measuring contact angle and peel strength.
젤라틴에 메틸메타크릴레이트로 유화중합시킨 그라프트 폴리머의 열분해에 관한 연구
설수덕,박찬헌,신은주,왕석주 동아대학교 공과대학 부설 한국자원개발연구소 1994 硏究報告 Vol.18 No.2
Emulsion graft copolymerization with sodium lauryl sulfate(SLS) of methyl methacrylate(MMA) onto gelatin was carried out in aqueous solution by potassium persulfate(KPS) as an initiator and thermal degradation of graft copolymer was stuied using a dynamic and isothermal thermogravimetry in the stream of nitrogen gas with 60㎖/min at various heating rate from 4 to 20℃/min, and various time at 200℃ The optimun concentration on emulsion graft copolymerization of KPS, gelatin, MMA, reaction temperature and time were 12×10^(-4)㏖/ℓ, 6g, 6.3×10^(-1)㏖/ℓ, 65℃ and 4hours, respectively. The activation energy of polymerization was 17.8 ㎉/㏖. The range of activation energies of decomposition obtained using Friedman's method was between49~57 ㎉/㏖ and using Ozawa's method was between 44~52㎉/㏖. The thermal degradation of gelatin-g-PMMA is likely due to decomposition of PMMA branches dominantely.
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.
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)
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.
α-셀로로오즈와 AN의 Graft공중합체의 열분해 특성
설수덕,이동호 동아대학교 공과대학부설 생산기술연구소 1998 生産技術硏究所硏究論文集 Vol.3 No.2
Thermal decomposition mechanism and kinectics of α-cellulose on Grafting of Acrylonitrile onto partially α-Cellulose were obtained using thermal analysis, pyrolysis gas chromatography and fourier transform-infrared spectrometer method under dynamic and isothermal condition in the stream of nitrogen. 1. the values of activation energy evaluated by Friedman's and Ozawa's method were consistent with each other very well. it was possible to determine the thermal stability of samples from these results. 2. the optimum thermal stabilization in Acrylonitrile-grafted α-cellulose was obtained in composition of 5∼10% AN.
회분식 반응기에서 무수말레인산과 알킬메타크릴레이트의 공중합속도론
설수덕,황준호,김남석 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.2
Radical copolymerization of maleic anhydride with methylmethacrylate, ethyl methacrylate was carried out in a Batch reactor. Solvent and initiator used were n,n-dimethylformamide and AIBN, repectavely. Reaction volume was 500 litters, polymerization time 10 hours and polymerization temperature 60∼80℃. The copolymerization conversions were analyzed by FT-IR, EA, GPC, and confirmed by measuring the solid weights of copplymers obtained after evaporating solvent. The monomer reactivity ratio were determined by the Kelen-T ds method.
설수덕,서영옥,최경선 한국공업화학회 1998 응용화학 Vol.2 No.2
Kinetics of solution photopolymerization of Acrylonitrile(AN) with inorganic salt for sensitizer such as, NaSCN, KSCN, Ba(SCN)₂, NH₄SCN, ZnCl₂, Na₂SeO₃ was studied using the UV crosslinker at various monomer concentration(1.8∼7.58 mol/1), salt concentration(10∼60%), reaction temperature(10∼70℃), energy intensity(1000∼9900 μ J/cm²) under isothermal condition in the stream of nitrogen. Under irradiation of high-pressure mercury lamp( λ =365nm) AN was polymerized to high conversion and uniform average molecular weight as compared thermal polymerization with the reaction temperature of 50℃, reaction time of 3hr and 50% NaSCN without any initiator.