- Synthesis and application of urethane-containing azo disperse dyes on polyamide fabrics
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A series of new azo disperse dyes containing the urethane group were synthesized through the reaction between the hydroxyl group in coupling component of disperse dyes and p-toluene isocyanate. The structures of the new dyes were fully confirmed by 1H NMR, 13C NMR, FT-IR, MS and Elemental analysis. Their characteristics for the visible-light absorption and color fastness on polyamide fibers were respectively measured and compared with those of the original dye. It was found that the new dyes exhibited hypsochromic effect, and had the nearly unchanged absorption half band and higher molar extinction coefficients, the fastness properties has been greatly improved, especially for the washing and sublimation fastness. The new dyes 2d and 2e containing double urethane groups possessed excellent fastness properties on polyamide fabrics. These two dyes for all the fastness tested, including water fastness, sublimation fastness, rubbing fastness and light fastness, had reached 4–5 and 5 rates. It was very clear that the introduction of urethane group and the increase of molecular weight can effectively improve the fastness of disperse dyes for the polyamide fibers.
- Fang, Shuaijun,Feng, Gaofeng,Guo, Yuqiu,Chen, Weiguo,Qian, Hongfei
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- Triphenyl moieties as building blocks for obtaining molecular glasses with nonlinear optical activity
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The incorporation of trityl and triphenylsilyl groups into low molecular weight molecules allows the formation of stable molecular glasses. A series of materials based on the N-phenyldiethanolamine core was synthesized bearing different azobenzenes and benzylydene-1,3-indandione as active chromophores. Molecular hyperpolarizability of the synthesized compounds was calculated by a restricted Hartree-Fock method with basis 6-31G(d,p) and measured in solutions by hyper-Rayleigh scattering. Non-linear optical (NLO) activity of the thin glassy films was confirmed after a corona poling procedure. Thermal sustainability of the NLO response of up to 85 °C was achieved. Quantum chemical calculations of the compounds revealed increased steric bulk and conformational freedom of the triphenylsilyl moiety. While the presence of the triphenylsilyl group results in more stable glasses and increased material nonlinearity, in the case of trityl groups, measured glass transition temperatures are higher.
- Traskovskis, Kaspars,Mihailovs, Igors,Tokmakovs, Andrejs,Jurgis, Andrejs,Kokars, Valdis,Rutkis, Martins
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experimental part
p. 11268 - 11276
(2012/08/14)
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- Cleavable multiblock copolymer synthesized by ring-opening metathesis copolymerization of cyclooctene and macrocyclic olefin and its hydrolysis to give carboxyl-telechelic polymer
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A novel cleavable multiblock copolymer was synthesized by ring-opening metathesis polymerization (ROMP) of cyclooctene (COE) and a flexible 27-membered macrocyclic olefin (MCO), which is acted as the spacer to collect the polymer structure block by block. MCO 2 was prepared via ring-closing metathesis of the long chain alkyldiene, and then 2 was wellconducted ROMP with COE to provide the multiblock copolymer [Poly(COE)-2]m consisting of homo-Poly(COE) blocks and ringopened 2 segments with different molecular weights (Mn = 30.0 - 249.6 × 103) and polydispersity index (PDI) within 1.45- .67 as variation of the feed ratio of COE to 2. The multiblock copolymer chain containing weak ester linkage can be cleaved under alkali condition to afford the carboxyl-telechelic Poly(COE) blocks with much lower molecular weights (Mn,h 1/4 3.6-35.7 103) and slight higher PDIs (1.65-1.88). The average block number on multiblock copolymer chain was obtained from the ratio of Mn toMn,h and was reached up to the value of 7-16.
- Xie, Meiran,Wang, Weizhen,Ding, Liang,Liu, Jingwei,Yang, Dan,Wei, Ling,Zhang, Yiqun
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body text
p. 380 - 388
(2010/11/04)
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