RT info:eu-repo/semantics/article
T1 Degradable high Tg sugar-derived polycarbonates from isosorbide and dihydroxyacetone
A1 García Gallego, Sandra
A1 Hult, Daniel
A1 Ingverud, Tobias
A1 Andrén, Oliver C. J.
A1 Malkoch, Michael
K1 Polycarbonates
K1 isosorbide
K1 dihydroxyacetone
K1 step-growth polymerization
K1 imidazol
K1 Química
K1 Chemistry
AB Polycarbonates from isosorbide and dihydroxyacetone (DHA) have been synthesised using organocatalytic step-growth polymerization of their corresponding diols and bis-carbonylimidazolide monomers. By the choice of the feed ratio and monomer activation, either isosorbide or ketal protected DHA, random and alternating poly(Iso-co-DHA) carbonates have been formed. Thermal properties by DSC and TGA were herein strongly correlated to the monomer composition. Dilution studies using 1H-NMR spectroscopy of a model compound DHA-diethyl carbonate in CD3CN and D2O highlighted the influence of alfa-substituents on the keto/hydrate equilibrium of DHA. Further kinetics studies in the pH* range of 4.7 to 9.6 serve to show the hydrolytic pH-profile of DHA-carbonates. The hydrolytic degradation of deprotected polymer pellets shows an increased degradation with increasing DHA content. Pellets with a random or alternating configuration show different characteristics in terms of mass loss and molecular weight loss profile over time.
SN 1759-9954
YR 2018
FD 2018-03-12
LK http://hdl.handle.net/10017/35559
UL http://hdl.handle.net/10017/35559
LA eng
DS MINDS@UW
RD 23-abr-2024