• Bulletin of the Korean Chemical Society
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• 제12권2호
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• pp.149-153
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• 1991

Chlorotrimethylsilane reacts with chromic anhydride to form a very reactive neutral chromium (Ⅵ) oxidizing agent. The active oxidizing species is not trimethylsilyl chlorochromate as was previously reported but chromyl chloride generated in equilibrium concentration. This oxidizing agent was proved very suitable for benzylic oxidations of toluenes and alkylbenzenes to benzaldehydes and aralkyl ketones. Dichlorodimethylsilane and trichlormethylsilane also react with chromic anhydride to form chromyl chloride in an equilibrium concentration.

• 대한화학회지
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• 제19권5호
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• pp.367-374
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• 1975

N-X-glycylphenylalanine methyl ester(X-trifluoroacetyl or acetyl)의 글리신잔기를 광 알킬화 반응에 의해 aspartic acid 의 유도체로 전환하였다. 이 반응은 diacetyl/di-t-butyl peroxide(DBP)를 광 개시제로, acetic anhydride를 알킬화제로 하여 350nm 파장의 램프를 사용하므로써 일어난다. DBP와 acetic anhydride에 의한 열반응의 경우에도 같은 알킬화 반응을 관찰하였다. 이 열알킬화 반응은 자유라디칼 반응을 거쳐 일어나기 때문에 이와 비교하여 광 알킬화 반응도 자유라디칼 메카니즘에 의해 일어난 것으로 추측된다.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2003년도 The Korea-Japan Joint Symposium
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• pp.63-64
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• 2003

As a part of a research on the development of polymeric textile finishing agents, polymerization of low molecular weight copolymers containing maleic anhydride residues have been studied. In order to obtain low molecular weight poly(maleic anhydride-co-vinyl acetate) copolymers, the feed ratio of the two monomers and the concentrations of initiator and chain transfer agent were varied in the copolymerization. The copolymers were characterized using GPC, NMR, FTIR, DSC, and TGA. Copolymers with molecular weights in the range 2,150 to 6,630 have been prepared and characterized. The hydrolysis of the anhydride groups of the copolymer in water is also discussed.

• 대한화학회지
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• 제22권4호
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• pp.268-274
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• 1978

Propylene sulfide를 o-sulfobenzoic anhydride로 중합시키면 양성이온 메카니즘에 의하여 중합이 진행되며, 이 반응의 속도를 연구하였다. 반응계중의 단위체와 개시제의 농도는 IR과 NMR를 이용하여 측정하였다. 성장반응속도가 개시반응속도보다 $10^3$정도 빠르며 이러한 결과는 양성이온 메카니즘에 의하여 생긴것으로 사료된다.

• 한국마이크로전자및패키징학회:학술대회논문집
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• 한국마이크로전자및패키징학회 2002년도 춘계 기술심포지움 논문집
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• pp.152-157
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• 2002

The cure and rheological behavior of Diglycidyl ether of bisphenol F, catalyzed by four kinds of imidazoles and a Nadic methyl anhydride curing agent were studied using a differential scanning calorimeter (DSC) and rheometer. The isothermal traces were employed to analyze cure reaction. The DGEBF/anhydride conversion profiles showed autocatalyzed reaction characterized by maximum conversion rate at 20~40 % of the reaction. The rate constants obtained from isothermal test showed temperature dependance, but reaction order did not. The order of reaction (m+n) was calculated to be close to 3. The measurements of viscosity and relation time in the presence of inorganic fillers were carried out at different isothermal curing temperatures. The viscosity and gelation time increased with filler content at the same isothermal temperature.

• Journal of the Korean Wood Science and Technology
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• 제21권2호
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• pp.31-37
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• 1993

Composites of styrene polymers with woody fibers were prepared, and the effect of compatibilizers on their mechanical properties was evaluated. To improve the compatibility of wood fibers and the matrix polymers, styrene-maleic anhydride copolymer(SMA) and maleic anhydride-modified polymers were used as compatibilizers. As results, maleic anhydride-modified polystyrene and SMA were proved to improve the tensile strength of the molded composites, and also were evaluated as good compatibilizers for the wood fiber polystyrene composite. Cellulosic fiber (dissolving pulp) provided better reinforcement than lignocellulosic fiber(thermomechanical pulp). On the contrary in the case of the composite of wood fiber and acrylonitrile-butadiene styrene copolymer(ABS), SMA and maleic anhydride-modified acrylonitrile-butadiene-styrene copolymer(MABS) did not act as compatibilizers. However, MABS was evaluated as a good polymer matrix to make wood fiber reinforced composite. The tensile properties of the composites of wood fiber and MABS were superior than those of wood fiber-ABS composites.

• 펄프종이기술
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• 제37권5호통권113호
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• pp.35-40
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• 2005

We tried to synthesize the 2-methyl anthraquinone (2-MAQ) with reaction between phthalic anhydride and toluene instead of using 2-methyl phthalic anhydride and benzene. This process didn't generate significant of amount of 1-methyl anthraquinone (l-MAQ) as byproduct. The other advantage of this pathway is using less toxic toluene instead of benzene known as carcinogen. 2-MAQ synthesized this pathway was as effective as reagent grade from commercial available based on soda-anthraquinone(AQ) pulping results.

• 한국염색가공학회지
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• 제28권2호
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• pp.57-62
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• 2016

We have synthesized five novel phthaloperinone dyes via a condensation reaction to be applied as yellow colorants for liquid crystal display(LCD) color filters. The reaction between 1,8-naphthalic anhydride(1a), 4-chloro-1,8-naphthalic anhydride(1b), 4-bromo-1,8-naphthalic anhydride(1c), 3-nitro-1,8-naphthalic anhydride(1d), 4-nitro-1,8-naphthalic anhydride(1e) and 1,2-diaminoanthraquinone(2) proceeded readily giving a product in 72-88% yields. The synthesized dyes were characterized by UV-Vis, mass spectrometry and elemental analysis. The spectral properties and thermal stability of the dyes were examined. The dyes absorb at around 400-450nm. All five dyes showed satisfactory thermal stability: the dyes retain 99-100% of its original weight at $300^{\circ}C$, 98-100% at $350^{\circ}C$, 92-98% at $400^{\circ}C$, and 84-92% at $450^{\circ}C$. We have quantitatively evaluated the reaction mechanism and reactivity of dye molecules by means of Pariser-Parr-Pople Molecular Orbital Method(PPP-MO).

• 접착 및 계면
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• 제10권3호
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• pp.117-126
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• 2009

에폭시/산무수물 경화제계에 실리카를 필러로 사용하여 에폭시 접착제의 경화거동과 특성을 알아보았다. DSC와 stress rheometer를 이용하여 측정한 에폭시 수지의 경화거동에서는 승온 속도를 증가시키거나 등온에서 경화 온도가 높을수록 gelation 온도는 높아졌으나 경화도는 감소함을 확인하였다. 열 안정성은 실리카 간의 응집 및 수분으로 인해 미세한 질량 감소 차이 외에 실리카 함량에 따른 변화는 없는 것으로 나타났다. 실리카가 첨가된 경화물의 열팽창계수는 실리카를 30 wt% 첨가하였을 때 약 33%의 감소하여 $40ppm/^{\circ}C$ 임을 확인하였다. 동역학적인 물성은 필러를 첨가하지 않은 시편의 저장탄성률(2,377 MPa)에 비해 30 wt%의 실리카 함량이 첨가된 시편의 저장탄성률(3,909 MPa)은 약 60% 증가하였다. 실리카의 표면을 실란 커플링제로 처리한 시편의 경우 저장탄성률이 감소하였다.

• 대한화학회지
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• 제39권2호
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• pp.94-102
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• 1995

모세관 기체크로마토그래피에 의한 cyclodextrin 정지상들(PH-${\beta}$-CD, DA-${\beta}$-CD, TA-${\gamma}$-CD)을 이용하여 라세미 알코올들과 그 유도체들의 분리를 연구하였다. 실험에 사용한 모든 알코올들은 trifluoro acetic anhydride, acetic anhydride, trichloro acetic anhydride를 써서 유도화하였다. 거울상체들의 분리선택성은 acylation 시약의 형태에 상당히 의존하는 것을 알았다. 알코올과 그 유도체들의 광학분활에 대한 최상의 실험조건은 용질분자들의 극성에 따라 다르다. 그리고 키랄분리에 관해서 온도, 컬럼이 극성, 수소 결합력, 알코올과 CD 정지상의 입체효과 등의 의존에 관한 연구를 행하였다. 키랄 인식 기구는 키랄 정지상의 종류에 의존하지 않고, 라세미 알코올의 유도체화에 의존하는 것으로 나타났다.