• 한국염색가공학회지
• /
• 제24권4호
• /
• pp.281-287
• /
• 2012

Poly(phenylene sulfide) films containing acetophenone as a photoinitiator were photocrosslinked under UV irradiation using a continuous UV irradiator. The gel fraction of the irradiated PPS in 1-Chloro naphthalene reached 94.7% with increasing UV energy and the photoinitiator concentration in the film upto $200J/cm^2$ and 12wt% respectively. Solid state $^1C$ NMR analysis suggested that the crosslinking occurred between the phenylene chains in PPS, indicating that the acetophenone may the phenylene hydrogens and subsequently adjacent polymer radicals could be recombined to form the crosslinked structure. The crosslinking improved the thermal behavior of PPS such as loss of $T_g$ and $T_c$, higher melting point and lower melting enthalphy as well as significantly higher peak pyrolysis temperature as much as $63.5^{\circ}C$. Surprisingly the tensile toughness of the most crosslinked PPS increased by 842%, resulting from the substantial enhancements in tensile modulus, strength and strain as much as 76%, 236% and 240% respectively. Also dynamic mechanical measurement indicated that the distance between crosslinks in the crosslinked PPS reached 85.3 g/mol corresponing to a crosslink density of 0.012 mol/g.

• 한국응용과학기술학회지
• /
• 제8권2호
• /
• pp.175-181
• /
• 1991

The kinetics of the addition of 1-benzylindole-3-(p-substituted) acetophenone derivatives was investigated by ultraviolet spectrophotometery in 30% dioxane -$H_2O\;at\;25^{\circ}C$. A rate equation which can be applied over wide pH range was obtained. The Substituent effects on 1-benzylindole-3-(p-substituted) acetophenone derivatives were studied, and addition were facilitated by electron attracting groups. On the base of the rate equation, substituent effect, and general base effect the plausible addition mechanism was proposed : Below pH 3.0, only neutral thiourea molecule was added to the carbon-carbon double bond, and in the range of pH 0.0${\sim}$14.0, netural thiourea molecule and thiourea anion competitively attacted the double bond. By contrast, above pH 10.0, the reaction was dependent upon only the addition of thiourea anion.

• Bulletin of the Korean Chemical Society
• /
• 제15권1호
• /
• pp.53-57
• /
• 1994

A comparison study on asymmetric borane reduction of ketoxime ethers and N-substituted ketimines possesing C = N double bond mediated by the selected chiral oxazaborolidines (1-6) was investigated. Thus, an aromatic ketoxime O-alkyl ether acetophenone oxime O-methyl ether was reduced to the corresponding amine (1-phenylethylamine 8a) with optical yields, such as 58% ee with 1, 86% ee with 2, 3% ee with 3, 99% ee with 4, 60% ee with 5, and 73% ee with 6. However, the reduction of an aliphatic ketoxime derivative 2-heptanone oxime O-methyl ether provided low optical inductions (7-13% ee). For ketoxime O-trimethylsilyl ethers, the reduction of acetophenone O-trimethylsilyl ether afforded 8a with optical yields which were 90% ee with 1, 40% ee with 2, 2% ee with 3, 62% ee with 4, 5% ee with 5, and 60% ee with 6. The reduction of 2-heptanone O-trimethylsilyl ether also gave the product amine with low optical yields (10-40% ee). In the case of N-substituted ketimines, the reduction of acetophenone N-phenylimine afforded the corresponding amine with 79% ee, 78% ee, 9% ee, 73% ee, 78% ee and 67% ee using 1, 2, 3, 4, 5, and 6, respectively, whereas low optical inductions (5-18% ee) for 2-heptanone N-phenylimine were achieved.

• Bulletin of the Korean Chemical Society
• /
• 제16권6호
• /
• pp.470-472
• /
• 1995

• Archives of Pharmacal Research
• /
• 제25권6호
• /
• pp.786-789
• /
• 2002

The total synthesis of a norneolignan isolated from Ratanhia, 5-(3-hydroxypropyl)-2-(2'-methoxy-4'-hydroxyphenyl)benzofuran (8), is described. The key steps contain the one-pot reaction for a 2-arylbenzofuran 6 from methyl 3-(4-hydroxyphenyl)propionate with 2-chloro-2-methylthio-(2'-methoxy-4'-acetoxy)acetophenone (5) in the presence of $ZnCl_2$, and reductive desulfurization of the resulting product 6.

• 한국염색가공학회:학술대회논문집
• /
• 한국염색가공학회 2011년도 제44차 학술발표회
• /
• pp.57-57
• /
• 2011

본 실험에서는 메타 아라미드 섬유의 basic dye에 대한 염색성 특히, 물과 acetophenone을 적용한 수계 염색과 친환경 염색 매개체인 이산화탄소 초임계유체를 사용한 염색을 수행한 후에 염색된 시료에 대한 염색성을 평가하였다. 수계염색의 경우, co-solvent carrier로 acetophenone 사용하였으며, 초임계유체 염색에서는 ethanol을 co-solvent로 사용하였다. 염색된 시료의 염색성 평가는 색차계를 사용하여 실시하였으며, 최대흡수파장에서 표면반사율에 따른 Kubelka-Munk식을 적용하여 K/S값을 계산하였다. 수계 및 초임계 염색에 의해 염색된 시료가 동일한 K/S 값을 가지기 위해서는 초임계염색이 상대적으로 높은 농도의 염료가 요구되어졌다. 또한 UV-vis. 분광분석법과 광학현미경을 통한 염색시료의 염색성의 평가가 이루어졌다.

• 자연과학논문집
• /
• 제9권1호
• /
• pp.169-175
• /
• 1997

효과적인 캐리어로 알려진 벤질알콜, 벤즈알데히드, 아세트 페놀을 사용하여 PET섬유를 분산염료로 염색함에 있어 캐리어 종류에 따른 염색성 특히 혼합용매의 효과를 평가하고 아울러 일광견뢰도, 세탁견뢰도, 인장강도와 같은 염색후의 물성변화에 대해 연구 검토하였다. 실험결과 벤즈알데히드와 아세트페놀의 혼합용매에서 가장 우수한 염색성을 보였으며 효과적인 캐리어 작용은 일광견뢰도 및 인장강도와 같은 물성을 크게 떨어뜨리는 결과를 가져왔다.

• 분석과학
• /
• 제9권4호
• /
• pp.331-335
• /
• 1996

국내산 녹차나무꽃의 향기성분을 기체 크로마토그래피 및 질량분석법으로 분석하였다. 시료 중 56종의 화합물이 분리확인되었으며, hydrocarbon류 22종, alcohol류 14종, aldehyde류 6종, ester류 5종, 기타 9종이었다. Heneicosyl formate와 ${\alpha}$-phenyl ethyl alcohol, acetophenone 등이 많이 포함되어 있었고, sesquiterpene 성분인 germacrene D도 확인되었다.

• Archives of Pharmacal Research
• /
• 제23권5호
• /
• pp.438-440
• /
• 2000

The total synthesis of a demethoxy-egonol isolated from Styrax obassia, 5-(3-hydroxypropyl)-2-(3',4'-methylenedioxyphenyl)benzofuran (9), is described. The key steps involve the construction of a 2-arylbenzofuran skeleton 7 from methyl 3-(4-hydroxyphenyl)propionate with 2-chloro-2-methylthio-(3',4'-methylenedioxy) acetophenone (6) in the presence of ZnCl$_2$ and successive desulfurization of the resulting product 7.

• Journal of Photoscience
• /
• 제6권3호
• /
• pp.145-151
• /
• 1999

The use of O-carbamoyloximes as photobase generators was investigated. $\alpha$-Meth-ylbenzilydeneamino phenylcarbamate(2a) and $\alpha$-methyl benzilydeneamino cyclohexylcarbamate(2b) were prepared by the reaction of phenyl or cyclohexyl isocyanates with acetophenone oxime , respectively. Aniline, phenylhydrazine and N, N'-diphenylhydrazine were detected in thephotolysis of 2a and cyclohexylamine and cyclohexylhydrazine in the photolysis of 2b. A monomer having pendant carbamoyloxyimino groups (BGM) was prepared by the reaction fo methancryloyloxyethyl iocyanate with acetophenone oxime, and copolymerized with styrene. The BGM copolymer films turned insoluble on UV irradiation, and the degree of insolubilizationwas increased by post-baking. The photocrosslinking was thought to be due to coupling of resulting pendant aminyl radicals, and the thermal crosslinking was due to association of resulting amino and hydrazino groups by hydrogen bonding. The introduction of epoxy groups into polymer increased the degree of thermal crosslinking by post-baking.