• Korean Journal of Materials Research
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• v.9 no.11
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• pp.1148-1152
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• 1999

An organometallic precursor, hfac(hexafluoroacetylacetonate) Cu(I) DMB (3,3-dimethyl- 1-butene) was synthesized, evaluated and compared with other precursors for metal organic chemical vapor deposition of copper thin films. It was found that at $40^{\circ}C$, the vapor pressure was an order of magnitude higher (about 3 torr) than (hfac) Cu vinyltrimethylsilane (VTMS) and films could be deposited at the substrate temperature of 100-$280^{\circ}C$ with deposition rate substantially higher. The copper films contained no detectable impurities as measured by Auger electron spectroscopy and had a resistivity of about 2.0$\mu\Omega$-cm in the deposition temperature range of 150 to $250^{\circ}C$. From the thermal analysis, (hfac)Cu(I)(DMB) is believed to be quite stable and no appreciable amount of precipitation was observed at $65^{\circ}C$ heating for more than a month.

• Applied Chemistry for Engineering
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• v.19 no.3
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• pp.322-325
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• 2008

3,3-Dimethyl-1-butene ($C_6H_{12}$) monomer was deposited using a plasma-enhanced chemical vapor deposition (PECVD) instrument. The more the R.F. power/pressure ratio in FT-IR spectrum, the less the hydrogen quantity and the dangling bond in amorphous carbon films observed so that the mechanical property of the films are improved related to the density. Also, with the increase D peak in Raman spectrum is increased and the ring structure's films are produced. According to these results, hardness and modulus are 12 GPa and 85 GPa, respectively. The refractive index (n) and extinction coefficients (k) of the deposited films are increased with the increase in a power/pressure ratio.

• Bulletin of the Korean Chemical Society
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• v.28 no.8
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• pp.1273-1279
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• 2007

The NiSO4 supported on Fe2O3 catalysts were prepared by the impregnation method. No diffraction line of nickel sulfate was observed up to 30 wt %, indicating good dispersion of nickel sulfate on the surface of Fe2O3. The addition of nickel sulfate to Fe2O3 shifted the phase transition of Fe2O3 (from amorphous to hematite) to higher temperatures because of the interaction between nickel sulfate and Fe2O3. 20-NiSO4/Fe2O3 containing 20 wt % of NiSO4 and calcined at 500 oC exhibited a maximum catalytic activity for ethylene dimerization. The initial product of ethylene dimerization was found to be 1-butene and the initially produced 1-butene was also isomerized to 2-butene during the reaction. The catalytic activities were correlated with the acidity of catalysts measured by the ammonia chemisorption method.

• Bulletin of the Korean Chemical Society
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• v.18 no.5
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• pp.543-544
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• 1997

• Macromolecular Research
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• v.11 no.2
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• pp.87-91
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• 2003

Thermal decomposition reactions of polystyrene using a new heating medium were carried out by a batch system at 190-280 $^{\circ}C$ to clarify the manner in which decomposition is initiated. Polystyrene obtained from a commercial source and low molecular weight compounds obtained from the thermal decomposition were analyzed by GC, GPC, IR, $^{13}$ C-NMR and GC-MS. The main chain underwent virtually no change by heat application. Polystyrene underwent decomposition below its molding temperature and the major decomposition products were 2,4,6-triphenyl-1-hexene (trimer), 2,4-diphenyl-1-butene(dimer) and styrene (monomer). Ethylbenzene, propylbenzene, naphthalene, benzaldehyde, biphenyl and 1,3-diphenylpropane were detected as minor products. This paper presents a new method for examining the decomposition of polystyrene at low temperature into volatile low molecular weight compounds.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2007.06a
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• pp.129-130
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• 2007

3,3-Dimethyl-1-butene ($C_6H_{12}$) monomer를 이용하여 RF power와 압력에 따라 막을 증착하였다. Power/pressure (W/Torr)가 증가할수록 증착된 비정질 탄소막은 FT-IR 스펙트럼에서 $CH_x$ (at around $2900cm^{-1}$)는 감소하였지 만 elastic modulus는 증가하는 것으로 나타났다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2007.06a
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• pp.185-186
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• 2007

3,3-Dimethyl-1-butene ($C_6H_{12}$) monomer를 이용하여 RF power와 압력에 따라 막을 증착하였다. 증착된 막은 power/pressure (W/Torr)가 증가할수록 비정질 탄소막은 FT-IR 스펙트럼에서 $CH_x$ (at around $2900cm^{-1}$)는 감소하였고, n과 k값은 증가하는 것으로 나타났다.

• Bulletin of the Korean Chemical Society
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• v.8 no.5
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• pp.376-380
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• 1987

The cyclobutane forming photocycloaddition reaction of 5(E)-styryl-1,3-dimethyluracil with some olefins occurs on the 5,6-double bond of uracil ring rather than the expected central double bond via an intermediate, probably the photochemical Diels-Alder type adduct. This intermediate formed on short term irradiation of 5(E)-styryl-1,3-dimethyluracil and 2,3-dimethyl-2-butene solution is converted into the $C_4$-cycloadduct on the prolonged irradiation. Quantum yield of the intermediate formation is not linear with the concentration of 2,3-dimethyl-2-butene probably due to the secondary reaction accompanied with the complex reaction kinetics. The intermediate is formed from the lowest excited singlet state.

• Transactions of the Korean hydrogen and new energy society
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• v.32 no.6
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• pp.618-635
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• 2021

Environmental issues caused by our dependence on fossil fuels have caused our society to move toward new renewable sources of energy and chemicals. In this study, we develop an integrated process that co-produces butene oligomer (i.e., biofuels) and 1,3-butadiene (i.e., monomer for the production of synthetic rubber). To minimize utility consumption, we conduct heat integration. Then, we conduct a range of techno-economic analysis and life-cycle assessment to investigate economic and environmental feasibility of the proposed process.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2007.06a
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• pp.104-105
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• 2007

3,3-Dimethyl-1-butene($C_6H_{12}$) monomer를 이용하여 RF power와 압력에 따라 증착된 막의 refractive index와 extinction coefficient를 알아보았다. 증착된 막의 n & k는 power/pressure가 증가할수록 증가하였으며, Ar으로 증착된 막이 더 낮은 값을 갖는 것으로 나타났다.