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Biobased Waterborne Polyurethanes: PET Waste and Poly(caprolactone) Diol

Serbian researchers synthesized novel biobased poly(ester-urethane)s (PUDs) by solvent free homogeneous solution polymerization of poly(caprolactone) diol (PCL), castor oil-based polyols (COLs), dimethylolpropionic acid (DMPA), isophorone diisocyanate (IPDI) and 1,4-butane diol (BD) as the chain extender. The polyurethane dispersions were prepared by adding required amount of triethylamine (TEA) and water. In this work, castor oil-based polyols have been synthesized using the depolymerized oligoester obtained from glycolysis of PET waste with poly(ethylene glycol) (PEG 400) and castor oil. The effects of soft segment structure on coating properties were evaluated. The coating of sample with 95 wt.% of PCL diol as the soft segment content has the best thermal stability. Polyurethane coatings with excellent hardness and adhesion for sample with the highest ionic groups content were obtained.

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Volume 105, April 2017, Pages 111–122

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