Synthesis and structure investigation of hexamethylene diisocyanate (HDI)-based polyisocyanates

Synthesis and structure investigation of hexamethylene diisocyanate (HDI)-based polyisocyanates Solvent-free hexamethylene diisocyanate (HDI)-based polyisocyanates were prepared by cyclotrimerization of HDI monomer using tri-n-butylphosphine (TBP) as a catalyst, and characterized by gel permeation chromatography (GPC), nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FTIR), and mass spectrometry (MS). The GPC results revealed the effects of reaction time, temperature and concentration of TBP on the molecular weight distribution of the polyisocyanates. The structures of the polyisocyanates were identified and confirmed by the combined analysis of MS, FTIR and NMR. There are dimer, pentamer, heptamer and higher-molecular-weight oligomers presented in the product, beyond the main product of trimer oligomers. Research on Chemical Intermediates Springer Journals

Synthesis and structure investigation of hexamethylene diisocyanate (HDI)-based polyisocyanates

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Springer Netherlands
Copyright © 2016 by Springer Science+Business Media Dordrecht
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
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