| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1401518 | European Polymer Journal | 2016 | 11 Pages |
•A new coumarin diol monomer was designed.•PCL diol was prepared by ring-opening polymerization with coumarin diol as initiator.•Photo-dimerization/photo-cleavage showed increasing irreversibility from cycle to cycle.•Irradiation of coumarin-based polyurethane produced a tough elastomeric material.
A new coumarin diol was designed and used as initiator for the ring opening polymerization of ε-caprolactone. A photo-reactive polyurethane based on the resulting polycaprolactone diol with pendant coumarin moieties was synthesized. Photo-dimerization/photocleavage reactions were studied by UV and Raman. The linear non-irradiated soft polyurethane transformed into a tough elastomeric crosslinked material. DQ-NMR measurements showed that conversion of the photo-reaction was not directly related to relative amount of crosslinking but provided complementary information. Crosslinking reduced the crystallinity of the polycaprolactone segments and the melting point of the crystals.
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