Julian M. W. Chan, Xiyu Ke, et al.
Chemical Science
We report an efficient and environmentally-friendly method of synthesizing polyurethanes in aqueous solution via an isocyanate- and catalyst-free polymerization process. Five different polyurethanes were synthesized by first activating 1,6-hexanediol and poly(ethylene glycol) with bis(pentafluorophenyl) carbonate, and then polycondensing various ratios of the 1,6-hexanediol/ poly(ethylene glycol)-derived activated carbonates with JEFFAMINE. The polymerization process was confirmed by FTIR spectroscopy, 1H NMR spectroscopy, and gel permeation chromatography (GPC). The melting temperature was linearly dependent on the 1,6-hexanediol/poly(ethylene glycol) ratio, increasing with greater poly(ethylene glycol) content, as confirmed by differential scanning calorimetry (DSC). Similarly, the degree of crystallinity was also directly proportional to the poly(ethylene glycol) content. © 2013 The Royal Society of Chemistry.
Julian M. W. Chan, Xiyu Ke, et al.
Chemical Science
Xiyu Ke, Daniel J. Coady, et al.
Polymer Chemistry
Musan Zhang, Ankit Vora, et al.
Macromolecules
Julian Chan, Xiangyi Zhang, et al.
Journal of Chemical Education