The Royal Society
Browse
rsos180536_si_012.jpeg (31.35 kB)

Figure S10.jpeg from Synthesis and structure/properties characterizations of four polyurethane model hard segments

Download (31.35 kB)
figure
posted on 2018-07-10, 12:46 authored by Lei Jiang, Zhiyong Ren, Wei Zhao, Wentao Liu, Hao Liu, Chengshen Zhu
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, 1H NMR, 13C 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.

History