Figure S4.tif from Synthesis and structure/properties characterizations of four polyurethane model hard segments Lei Jiang Zhiyong Ren Wei Zhao Wentao Liu Hao Liu Chengshen Zhu 10.6084/m9.figshare.6797765.v1 https://rs.figshare.com/articles/figure/Figure_S4_tif_from_Synthesis_and_structure_properties_characterizations_of_four_polyurethane_model_hard_segments/6797765 Four model polyurethane (PU) hard segments were synthesized by reaction of butanol with four typical diisocyanates. The four diisocyanates were aromatic 4,4′-diphenylmethane diisocyanate (4,4′-MDI) and MDI-50 (50% mixture of 2,4′-MDI and 4,4′-MDI), cycloaliphatic 4,4′-dicyclohexylmethane diisocyanate and linear aliphatic 1,6-hexamethylene diisocyanate. FTIR, <sup>1</sup>H NMR, <sup>13</sup>C NMR, MS, X-ray and DSC methods were employed to determine their structures and to analyse their crystallization behaviours and hydrogen bonding interactions. Each of the four PU compounds prepared in the present work displays unique spectral characteristics. The FTIR bands and NMR resonance peaks assigned in the four samples thus provide a reliable database and starting point for investigating the relationship between hard segment structure and the crystallization and hydrogen bonding behaviour in more complex-segmented PU compositions. 2018-07-10 12:46:15 polyurethane hard segment structural characterization crystallization behaviour hydrogen bonding