%0 Journal Article 
%A García Gallego, Sandra
%A Hult, Daniel
%A Ingverud, Tobias
%A Andrén, Oliver C. J.
%A Malkoch, Michael
%T Degradable high Tg sugar-derived polycarbonates from isosorbide and dihydroxyacetone
%D 2018
%@ 1759-9954
%U http://hdl.handle.net/10017/35559
%X 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.
%K Polycarbonates
%K isosorbide
%K dihydroxyacetone
%K step-growth polymerization
%K imidazol
%K Química
%K Chemistry
%~ Biblioteca Universidad de Alcala