• 한국건축시공학회지
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• 제24권4호
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• pp.437-445
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• 2024

본 연구는 창호에 사용되고 있는 Azon과 Azo-Core를 셔터에 활용하여 단열성능을 확보하고자 Therm 7.4 프로그램과 기밀, 단열성 시험을 통해 검토하였다. 시뮬레이션 결과 Azon 및 Azo-Core는 기존의 단열재에 비해 단열성이 우수했으며 셔터에 적용 시 1등급의 기밀성능과 평균2.018W/m²·k의 열관류율을 확인하였다. 이는 외부셔터 설치 기준 중부지방 1.5W/m²·k, 남부지방 1.8W/m²·k보다 높은 수치이지만 제주지방 2.2W/m²·k에는 적용 가능한 수치이며 Azon과 병행 적용이 아닌 Azo-Core만 적용할 수 있는 추가 연구가 검토된다면 셔터 단열재로 사용 가능성이 있다.

• Bulletin of the Korean Chemical Society
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• 제29권4호
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• pp.761-766
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• 2008

Photoresponsive arylether dendrimers Bis-azo-Gn(3,5) 1a-1c and Bis-azo-Gn(3,4,5) 2a-2c (n = 1-3) with an azobenzene unit at the core and several vinyl groups (3,5-bis(but-3-enyloxy)phenyl groups or 3,4,5-tris(but-3- enyloxy)phenyl groups) at the periphery have been prepared. Their structures and reversible trans-cis isomerization behaviors have been investigated by $^1H$-NMR, $^{13}C$-NMR, MALDI-TOF-Mass, and UV-vis spectra. All six azobenzene-cored dendrimers carried out very fast trans $\rightarrow$ cis photoisomerization on irradiation of 350 nm light and reached to the photostationary state within 180 s. During the dark incubation, slow thermal back reversion from cis to trans form is observed for all six dendrimers and is completed within 3 days for 1a-1c and 1 day for 2a-2c. Isomerization efficiency decreases with increasing generation. However, the initial reaction rates of both trans $\rightarrow$ cis photochemical isomerization and cis $\rightarrow$ trans thermal isomerization increases significantly with increasing generation for dendrimers for 1a-1c but only slightly for 2a-2c.

• 한국재료학회지
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• 제16권7호
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• pp.422-429
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• 2006

Studies were performed on preparation of organic-inorganic hybrid silica dye in a dispersing ink system. The silica was subjected to surface modification using 3-aminopropyltrimethoxysilane (APTMS) in order to promote the chemical reactivity of the raw silica. On the surfaces of the aminosilane-functionalised silica, red vinylsulfone-containing azo dye was adsorbed. The dye was found to have chemically reacted with the aminosilane-grafted silica surface, which was proven by FT-IR spectra. Studies on morphology and microstructure were performed employing scanning electron microscopy. The SEM micrographs and particle size distributions showed that a homogeneous pigment can be obtained employing silica as a core. Particle size distribution was also examined using the technique of dynamic light scattering. The ensuing pigment was subjected to various physicochemical evaluation such as inkjet property, storage stability, color change as inkjet ink using printer, spectrophotometric, microscopic techniques. Studies on hybrid dyes from the silica surface demonstrated that, in general, stable pigments for inkjet dispersion ink were obtained.

• 한국염색가공학회지
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• 제15권6호
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• pp.8-17
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• 2003

In order to investigate the possibility of PVA particle as toner, PVA/PVAc particle was manufactured. Fine spherical PVAc particle with emulsifier SDS(sodium Dodecyl Sulfate) and initiator V-50(2,2'- azo bis(2-amidinopropane) dihydrochloride) was manufactured by emulsion polymerization. And then, the PVAc was carried with surface saponification. PVA/PVAc skin core structured particle was obtained under optimum saponification condition. PVA skin side in manufactured PVA/PVAc particles was dyed with 1:2 metal complex type C. I. Acid Yellow 235 and then the dyed PVA particles were observed with a optical microscope. Under given polymerization condition such as SDS concentration, $1.62\times{10}^{-2} \;mol/lH_2O$, V-50 concetration, $3.7\times{10}^{-3}\;mol/lH_2O$ and temperature $50^\circ{C}$ , the high molecular weight of PVAc with Pn 13,900 and PVA with Pn 3,400 was produced. The particle distribution of obtained PVAc microspheres was appeared highly at 60 and $100\mu{m}$, respectively.