• 접착 및 계면
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• 제13권2호
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• pp.53-57
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• 2012

Anisotropic conducting film (ACF)을 형성하기 위해서는 경화과정에 잠재성이 있어야만 하며, 보다 빠른 생산성을 갖기 위해서는 반응속도가 매우 높아야 한다. 이 연구에서는 여러 가지의 sulfonium 염들을 합성해서 epoxy 수지의 잠재성 경화제로 사용해 보았다. 이들 sulfonium 염들은 모두 우수한 잠재성을 보여 주었다. Differential scanning calorimetry (DSC)를 이용해서 이들의 경화거동을 살펴보았으며, $150^{\circ}C$에서의 경화 속도를 탐침법으로 측정하였다.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 1992년도 제2차 학술발표초록집
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• pp.102-102
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• 1992

• Bulletin of the Korean Chemical Society
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• 제11권5호
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• pp.415-420
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• 1990

A series of copolymers of poly(1,4-phenylenevinylene-co-2,3,5,6-tetramethyl- 1,4-phenylenevinylene), poly(PV-co-TMPV), were prepared in film forms from the precursor polymer films. The sulfonium salt precursor polymers were synthesized by copolymerization of the mixtures of the respective bis(sulfonium salt) monomers. All of the copolymer films could be doped with $FeCl_3$ to have high electrical conductivities and they showed good air stability. The maximum conductivity of the $FeCl_3$-doped films ranged $10^{-3}\;to\;10^2Scm^{-1}$ depending on the composition of the copolymer films. However, these copolymer films could not be doped with iodine. The coplanarity of PV and TMPV units in the main chain appears to be affected by steric effect of the methyl groups in the TMPV units.

• Bulletin of the Korean Chemical Society
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• 제33권1호
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• pp.48-54
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• 2012

The $[Fe_4S_4]^{2+}$ clusters with 2-, 3-, and 4-pyridinemethanethiolate (S2-Pic, S3-Pic, and S4-Pic, respectively) terminal ligands have been synthesized from the ligand substitution reaction of the $(^nBu_4N)_2[Fe_4S_4Cl_4]$ (I) cluster. The new $(^nBu_4N)_2[Fe_4S_4(SR)_4]$ (R = 2-Pic; II, 3-Pic; III, 4-Pic; IV) clusters were characterized by FTIR and UV-Vis spectroscopy. Cluster II was crystallized in the monoclinic space group C2/c with a = 24.530 (5) $\AA$, b = 24.636(4) $\AA$, c = 21.762(4) $\AA$, ${\beta}=103.253(3)^{\circ}$, and Z = 8. The X-ray structure of II showed two unique 2:2 site-differentiated $[Fe_4S_4]^{2+}$ clusters due to the bidentate-mode coordination by 2-pyridinemethanethiolate ligands. Cluster III was crystallized in the same monoclinic space group C2/c with a = 26.0740(18) $\AA$, b = 23.3195(16) $\AA$, c = 22.3720(15) $\AA$, ${\beta}=100.467(2)^{\circ}$, and Z = 8. The 3-pyridinemethanethiolate ligand of III was coordinated to the $[Fe_4S_4]^{2+}$ core as a terminal mode. Cluster IV with 4-pyridinemethanethiolate ligands was found to have a similar structure to the cluster III. Fully reversible $[Fe_4S_4]^{2+}/[Fe_4S_4]^+$ redox waves were observed from all three clusters by cyclic voltammetry measurement. The electrochemical potentials for the $[Fe_4S_4]^{2+}/[Fe_4S_4]^+$ transition decreased in the order of II, III and IV, and the reduction potential changes by the ligands were explained based on the structural differences among the complexes. The complex III was reacted with sulfonium salt of $[PhMeSCH_2-p-C_6H_4CN](BF_4)$ in MeCN to test possible radical-involving reaction as a functional model of the [$Fe_4S_4$]-SAM (S-adenosylmethionine) cofactor. However, the isolated reaction products of 3-pyridinemethanethiolate-p-cyanobenzylsulfide and thioanisole suggested that the reaction followed an ionic mechanism and the products formed from the terminal ligand attack to the sulfonium.

• 한국응용과학기술학회지
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• 제34권2호
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• pp.203-209
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• 2017

양이온계 광중합에 적용 가능한 propenyl ether 형태의 단량체들을 mono 및 di-functional alcohol과 allyl bromide의 축합반응으로 합성하였다. 이들 단량체들을 양이온 광개시제와 혼용하여 코팅조성물을 제조하여 광경화 반응성을 조사하였다. 그 결과 mono propenyl ether 형태인((prop-1-en-1-yloxy)methyl)benzene (POMB)는 dipropenyl ether 계인 1,4-bis(prop-1-en-1-yloxy) benzene (BPOB) 비교하여 초기 중합 속도는 10.2로 상대적으로 낮게 나타났으나 1.5mol%의 광개시제를 포합한 배합물에서는 90초이내에 거의 정량적으로 반응하였다. 또한 긴알킬기를 갖는 술폰산 염계 광개시제들은 단량체들에 빠른 용해 특성을 나타내었고 산성도가 높은 광개시제인(4-n-decyloxyphenyl)diphenylsulfonium hexafluoroantimonate(DPSA)와 (4-n-decyloxyphenyl) diphenylsulfonium triflate (DPST)를 사용한 경우 비교적 높은 중합속도와 전환율을 나타내었다.