• Fibers and Polymers
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• v.5 no.3
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• pp.239-244
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• 2004

Solution-cast films of polymethylmethacrylate (PMMA) and polyurethane (PU) containing polymeric styryl dye up to 5 % by weight were prepared to investigate their acid-sensitivity and mechanical and thermal properties. Original red samples due to styryl dye turned out yellow very rapidly as they were exposed to acid vapor of hydrochloric acid or p-toluenesulfonic acid. According to UV/VIS spectroscopic measurements, characteristic peak intensities near 430 nm and 520 nm increased or decreased relatively with exposed amounts of acid, respectively. Both PMMA and PU samples showed uniform color distribution due to a good miscibility between polymer and dye which can be evidenced by measurements of glass transition temperature. No significant difference in acid-sensitivity was found between PU and PMMA except relative absorbance. However, dependence of their mechanical properties on dye content was somewhat different with PU or PMMA. In case of PMMA, modulus and breaking stress increased up to about 50 % with increasing dye content, whereas those of PU samples showed only slight increase. It was ascribed to whether the matrix polymer was in the glassy or rubbery state.

• Journal of the Korean Graphic Arts Communication Society
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• v.16 no.3
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• pp.147-156
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• 1998

A Photosensitive Crown Ether Styryl Dye derivative(CESD) was prepared for the application and the structure of it was discussed. Light excitation causes the trans-cis isomerization of CESD yielding a conformation suitable to form a coordination bond between an anion group and a metal cation located in crown ether. Intermolecular complex stabilized the cis isomer that absorbs at a shorter wavelength in the trend-cis isomerization. Application of CESD was suggested.

• Journal of Photoscience
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• v.8 no.3_4
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• pp.113-117
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• 2001

Several styrylquinolium salts were synthesized to investigate their absorption and thermal properties, which had five different p-aminobenzene units and three different counter ions (iodide, perchlorate, and hexafluorophosphorate anion), respectively. Hydroxy, methoxy, and methyl group in the meta position to the amino group led to bathochromic shift, while Ν-ethyl-Ν-chloroethylamino unit instead of Ν,Ν-diethylamino unit resulted in hypsochromic shift. A dye having a methoxy group in the meta position to the amino group had the highest molar extinction coefficient ($\xi$), while a dye carrying chloro group in Ν-alkyl chains had the lowest $\xi$. The type of counter ions had no effect on spectral properties like the maximum absorption wavelength and $\xi$. All styryl dyes had exothermic peaks at decomposition in DSC curves. Among these styryl dyes, S2 series with perchlorate anions showed the strongest exothermic decomposition. From TGA spectra, S3 series with hexafluorophosphorate anions had the best thermal stability and the sharpest threshold at thermal decomposition.

• Proceedings of the Korean Fiber Society Conference
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• 2003.04a
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• pp.60-63
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• 2003

Smart 재료는 외부의 환경으로부터 자극을 받을 경우 형상, 색, 전기적 또는 광학적 특성 등이 변할 수 있는 소재를 말한다. 기존의 재료들은 단지 주어진 환경변화를 수동적으로 받아들이는 데 대하여 smart 재료는 이런 한계를 넘어 생물체처럼 환경에 반응한다는 점에서 앞으로 새로운 소재로 각광받을 수 있을 것이다. 변색성 재료도 이와 같은 중요한 smart 소재에 해당하는데, 물질에 따라 광, 온도, 화학물질, 전기장 등의 외부 환경조건에 응답할 수 있다. (중략)