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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.
李基鐘,申奉燮 又石大學校 1982 論文集 Vol.4 No.-
The purpose of this study is to investigated the cure effect and vulcanizates properties of peroxide/dimaleimide cure system in comparison with sulfur, zinc oxide, resin and peroxide respectively when they are added to Brominated Butyl rubber as curing agents. 1) Brominated butyl rubber can be cured with peroxides or with N, N'-m-phenylene dimaleimide (HVA #2), but the best balance of cure rate and vulcanizates properties is obtained when a peroxide and HVA #2 are used together. 2) The resultant vulcanizates have unusually low compression set, high, heat resistance, and exceptional ozone resistance. Using in combination of 1.5phr of Dicup 40C or Vucup 40KE with 1.5phr of HVA #2 gives excellent results for above properties. 3) Peroxide-HVA #2 cure systems work well in both black and light-coloured compounds 4) Peroxide-HVA #2 cure systems have considerable potential in such applications as heat resisting conveyer belts, gaskets, hose, automoble part, and tire air bag. They may also offer an alternative compounding approach for pharmaceuticals in which the presence of sulfur, zine or organic acceleration would be objectionable.
수용성 및 가식성 콩 단백질/�틴 블렌드 필름 제조 및 물성 연구
김성철,신용섭,정세환,유성구,박인식,김봉식,신부영 한국공업화학회 2003 응용화학 Vol.7 No.2
The manufacture of edible/biodegradable films or coatings can potentially add value to soy protein, Such films can find using as edible or nonedible food packaging materials. The effect of soy protein film-forming solutions on film formation, tensile properties of soy protein/pectin blend films were changed significantly by the amount of glycerol and the ratio of soy protein/pectin. Moreover mechanical properties of soy protein/pectin-montmorillonite clay have been studied. Tensile strength and modulus decreases as the relative humidity increased while with increasing relative humidity elongation at break increased.
Shin, Yern-Hyerk,Beom, Ji Yoon,Chung, Beomkoo,Shin, Yoonho,Byun, Woong Sub,Moon, Kyuho,Bae, Munhyung,Lee, Sang Kook,Oh, Ki-Bong,Shin, Jongheon,Yoon, Yeo Joon,Oh, Dong-Chan American Chemical Society 2019 ORGANIC LETTERS Vol.21 No.6
<P>Bombyxamycins A and B (<B>1</B> and <B>2</B>) were discovered from a silkworm gut <I>Streptomyces</I> bacterium. Spectroscopic analysis and multiple-step chemical derivatization identified them as 26-membered cyclic lactams with polyene features. Bombyxamycin A showed significant antibacterial and antiproliferative effects. The bombyxamycin biosynthetic gene cluster was identified by genetic analysis. Gene deletion experiments confirmed that the cytochrome P450 BomK is responsible for the generation of <B>2</B>, which unprecedentedly bears tetrahydrofuran in its macrocyclic ring.</P> [FIG OMISSION]</BR>
Shin, Bong Sub,Seul, Soo Duk 한국화학공학회 1994 Korean Journal of Chemical Engineering Vol.11 No.2
Thermal decomposition of the copolymers of methyl methacrylate (MMA) with ethyl methacrylate (EMA) or n-butyl methacrylate (BMA) were investigated. The copolymers were obtained in a continuous stirred tank reactor (CSTR) using toluene and benzoyl peroxide, as solvent and initiator, respectively, at 80℃. The volume was 1.2 litters and residence time was 3 hours. The thermal decomposition followed the second order kinetics for both MMA/EMA and MMA/BMA copolymers, which were almost in accordance with the order of copolymerization in a CSTR. The activation energies of thermal decomposition were in the ranges of 32-37 ㎉/㏖ and 27-37 ㎉/㏖ for MMA/EMA and MMA/BMA copolymers, respectively and a good additivity rule was observed against each composition for bath copolymers. The thermogravimetric trace curve agreed well with the theoretical calculation.
Shin, Bong Sub,Seul, Soo Duk 한국화학공학회 1993 NICE Vol.11 No.2
Continuous solution copolymerization of methyl methacrylate with ethyl methacrylate or n-butyl methacrylate was carried out in a continuous stirred tank reactor. Solvent and initiator used were toluene and benzoyl peroxide, respectively. Reaction volume was flitters, residence time 3 hours and polymerization temperature 80℃. The copolymerization conversions were analyzed by UV spectrophotometry and confirmed by measuring the solid weights of copolymers obtained after evaporating solvent. The copolymerizaion of methyl methacrylate and alkyl methacrylates followed the second order kinetics. The simulated conversions and copolymerization rates were compared with the experimental results. The average time to reach dynamic steady state was three and half times of the residence time.
Shin, Bong Sub,Seul, Soo Duk 한국화학공학회 1994 NICE Vol.12 No.3
Thermal decomposition of the copolymers of methyl methacrylate(MMA) with ethyl methacrylate(EMA) or n-butyl methacrylate(BMA) were investigated. the copolymers were obtained in a continuous stirred tank reactor(CSTR) using toluene and benzoyl Eeroxide, as solvent and initiator, respectively, at 80℃. the volume was 1.2 litters and residence time was 3 hours. The thermal decomposition followed the second order kinetics for both MMA/EMA and MMA/BPuIA copolymers, which were almost in accordance with the order of copolymerization in a CSTR. The activation energies of thermal decomposition were in the ranges of 32∼37 kcal/mol and 27∼37 kcal/mole for MMA/EMA and MMA/BMA copolymers, respectively and a good additivity rule was observed against each composition for both copolymers. The thermogravimetric trace cue agreed well with the theoretical calculation.
Shin, Bong Sub,Seul, Soo Duk 한국화학공학회 1993 Korean Journal of Chemical Engineering Vol.10 No.1
Continuous solution copolymerization of methyl methacrylate with ethyl methacrylate or n-butyl methacrylate was carried out in a continuous stirred tank reactor. Solvent and initiator used were toluene and benzoyl peroxide, respectively. Reaction volume was 1.2 litters, residence time 3 hours and polymerization temperature 80℃. The copolymerization conversions were analyzed by UV spectrophotometry and confirmed by measuring the solid weights of copolymers obtained after evaporating solvent. The copolymerization of methyl methacrylate and alkyl methacrylates followed the second order kinetics. The simulated conversions and copolymerization rates were compared with the experimental results. The average time to reach dynamic steady-state was three and half times of the residence time.