caa a22 4500 465787061 CHVBK 20180323112012.0 cr unu---uuuuu 170327e19900901xx s 000 0 eng 10.1007/BF00306574 doi (NATIONALLICENCE)springer-10.1007/BF00306574 New polyurethanes with conjugated triple bonds [Elektronische Daten] [Huceste Çatalgil, Bahattin Baysal] Summary: Urethane polymers possessing two conjugated -C≡C- triple bonds per repeating unit are synthesized. Polyurethanes are characterized by their infrared absorption spectra, UV abrsorption spectra and elementel analysis. Their molecular weights and limit intrinsic viscosities are determined. Solutions of these polymers in various solvents do not show any reactivity when exposed to light or heat. However the solid polyurethanes and solvent cast polyurethane films obtained from trimethyl hexamethylene diisocyanate, and isophoron diisocyanate quite rapidly develop red-brown colour on annealing at elevated temperatures, below their melting point. During this process the polymers themselves and solvent cast polymer films become insoluble in any of the solvents. Their IR and UV absorption spectra before and after annealing are examined and the band gaps are calculated from the spectral data. Springer-Verlag, 1990 Çatalgil Huceste Kimya Bölümü, I.T.Ü. Fen-Edebiyat Fakültesi, Maslak, Istanbul, Turkey aut Baysal Bahattin Kimya Bölümü, I.T.Ü. Fen-Edebiyat Fakültesi, Maslak, Istanbul, Turkey aut Polymer Bulletin Springer-Verlag 24/3(1990-09-01), 271-275 0170-0839 24:3<271 1990 24 289 https://doi.org/10.1007/BF00306574 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00306574 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Çatalgil Huceste Kimya Bölümü, I.T.Ü. Fen-Edebiyat Fakültesi, Maslak, Istanbul, Turkey aut NATIONALLICENCE 700 1- Baysal Bahattin Kimya Bölümü, I.T.Ü. Fen-Edebiyat Fakültesi, Maslak, Istanbul, Turkey aut NATIONALLICENCE 773 0- Polymer Bulletin Springer-Verlag 24/3(1990-09-01), 271-275 0170-0839 24:3<271 1990 24 289 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer