Abstract
An ordered polyurethane with high head-to-tail (H-T) regularity (up to 93% ) was prepared by polyaddition reaction of p-isocyanatobenzyl isocyanate (1) with ethylene glycol (2) using 1,3-bis(isothiocyanate)-1,1,3,3-tetrabutyldistannoxane as catalyst. Polymerizations were conducted in N,N-dimethylformamide (DMF) at -40°C in the presence of distannoxane by mixing both monomers all at once. The microstructure of polymers obtained was investigated by 1H and 13C NMR spectroscopy, and it was found that the polymers had the expected H-T ordered structure. The ordered polyurethane with 93% H-T regularity showed higher melting point and crystallinity compared to the polymers with lower H-T regularity.
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Hikita, T., Mochizuki, A., Sugiyama, Ji. et al. Head-to-Tail Regularity of Polyurethanes from p-Isocyanatobenzyl Isocyanate and Ethylene Glycol by a Distannoxane Catalyst. Polym J 33, 547–553 (2001). https://doi.org/10.1295/polymj.33.547
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DOI: https://doi.org/10.1295/polymj.33.547