• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2000년도 봄 한국섬유공학회 학술발표회 논문집(Proceedings of the Korean Textile Conference)
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• pp.13-16
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• 2000

• Bulletin of the Korean Chemical Society
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• 제15권10호
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• pp.913-916
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• 1994

• Bulletin of the Korean Chemical Society
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• 제33권11호
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• pp.3593-3596
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• 2012

The water-soluble conjugated polymer with fluorescence quenching as a result of electrostatic interaction and aggregation was synthesized through Suzuki polymerization. The absorption and emission of anionic polymer (a-PFP) is blue shifted as compared with cationic polymer (c-PFP) although getting same backbone, and the absolute PL quantum efficiency of a-PFP in water is over 90% due to good solubility in aqueous solution. We anticipate that the fluorescence quenching of anionic and cationic polymers, with same conjugated backbone, could be shown in aqueous solution.

• 통합자연과학논문집
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• 제5권2호
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• pp.127-130
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• 2012

Polymerization of vinyl monomers is promoted by thianthrene cation radical as a part of our research concerning the reactions of various agents with readily isolable, yet highly reactive species and elucidate the biological activity. Thianthrene cation radical initiated the homopolymerization and copolymerization of styrene and ethyl vinyl ether. The polymerization yields decreased as the concentration of phenylacetylene or diphenylethylene increased. Such polymereization by cationic thianthrene radical could provide some clues for the reaction in living animals. Comments on possible polymerization mechanisms were suggested.

• 폴리머
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• 제32권4호
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• pp.366-371
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• 2008

The controlled/living cationic polymerization of $\alpha$-methylstyrene (${\alpha}MeSt$) and sequential block copolymerization of isobutylene (IB) with ${\alpha}MeSt$ were achieved using 2-chloro-2,4,4-trimethylpentane (TMPCl)/titanium tetrachloride ($TiCl_4$)/titanium isopropoxide ($Ti(OiPr)_4$)/2,6-ditert-butylpyridine (DtBP) initiating system in $CH_3Cl$/hexane(50/50 v/v) solvent mixture at $-80^{\circ}C$. The polymerization rate decreased with increasing $[Ti(OiPr)_4]/[TiCl_4]$ ratio in the homopolymerization of ${\alpha}MeSt$. The effects of $[Ti(OiPr)_4]/[TiCl_4]$ ratios and $PIB^+$ molecular weight on the polymerization rate and blocking efficiency were also investigated. Well-defined poly(isobutylene-b-$\alpha$-methylstyrene)s were demonstrated by $^1H$-NMR and triple detection SEC; refractive index (RI), multiangle laser light scattering (MALLS) and ultraviolet (UV) detectors. Blocking efficiencies for the poly(isobutylene-b-$\alpha$-methylstyrene)s of almost 100% were obtained when ${\alpha}MeSt$ was induced by PIB's of $M_n\;{\geq}\;41000$ at $[Ti(OiPr)_4]/[TiCl_4]=1$. Differential scanning calorimetry (DSC) of the block copolymers showed two glass transition temperatures, thereby demonstrating microphase separation.

• Bulletin of the Korean Chemical Society
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• 제12권3호
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• pp.271-273
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• 1991

Poly (N-vinylcarbazole) was obtained spontaneously by 1,1,2,2-tetracyanocyclopropylstyrene(1) in polar solvents such as dichloromethane and acetonitrile at room temperature. The polymerization reactions were faster in more polar solvent and were not proceeded in less polar solvents such as chloroform and diethyl ether. The formation of poly (N-vinylcarbazole) was explained by bond-forming initiation theory, in which the initiating species are zwitterionic tetramethylene intermediates.

• 폴리머
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• 제25권2호
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• pp.168-176
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• 2001

새로운 열잠재성 개시제로서 N-crotyl-N,N-dimethyl-4-methylanilinium hexafluoroan-timonate (CMH) 촉매가 diglycidylether of bisphenol A (DGEBA) 에폭시 양이온 중합계의 열적, 유변학적 특성 및 열정성에 미치는 영향에 대해 연구하였다. DSC에 의한 DGEBA/CMH 경화계의 열분석 결과, 본 경화계는 일정 온도까지 우수한 잠재성을 지닌 반응 기구임을 확인할 수 있었으며, 특히 개시제의 함량이 증가할수록 CMH의 높은 활성에 의해 DGEBA의 전환율 및 경화반응 속도가 증가하였다. 유변학적 특성은 레오미터를 사용하여 등온 조건 하, 저장 탄성율(G'), 손실 탄성율(G") 그리고 damping factor (tan $\delta$)를 구한 후 이들 데이터로부터 겔화 시간을 측정하였다. 실험 결과 경화 온도 및 CMH의 증가에 따른 활성의 차이로 인하여 에폭시 양이온 중합의 네트워크 구조 형성에 영향을 미쳐 겔화 시간이 단축됨을 알 수 있었다. 형성된 네트워크 구조의 열안정성은 TGA 분석을 통해 분해 활성화 에너지 및 열안정성 인자 등의 측정으로 고찰하였다.찰하였다.

• 통합자연과학논문집
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• 제6권2호
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• pp.71-75
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• 2013

$Bu_3Sn$-endded poly(vinyl)s with biological activity were obtained by the radical polymerization of vinyl monomers using thianthrene cation radical/$^nBu_3H$. Thianthrene cation and stannyl radicals promoted the homopolymerization and copolymerization of styrene and ethyl vinyl ether having number average molecular weights of 2000-3100. Tributyltin hydride functions as a chain transfer agent. Such polymereization by cationic thianthrene and stannyl radicals could provide some clues for the biological reaction in living animals. Plausible polymerization mechanisms were suggested.

• 공업화학
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• 제21권3호
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• pp.353-355
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• 2010

양이온성의 2,2'-azobis(2-methylpropionamidine) (AIBA) 개시제를 이용한 methylmethacrylate (MMA)의 무유화제 에멀전 중합을 통해 polymethylmethacrylate (PMMA) 입자를 합성하였다. 스퇴버 방법을 이용하여 양이온성의 PMMA 입자 표면에 실리카를 코팅하였다. 음전하의 실리카 전구체는 양이온성의 PMMA 입자 표면과의 정전기적 인력에 의해 코팅된다. 실리카 코팅 과정 중에 PMMA 입자가 용해되어 후처리 없이 실리카 중공체를 얻을 수 있었다.

• 대한화학회지
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• 제39권9호
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• pp.758-762
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• 1995