Hochschulschrift:
Dissertation, Albert-Ludwigs-Universität Freiburg im Breisgau, 2016
Anmerkungen:
Beschreibung:
Zusammenfassung: Isocyanate-based polyurethanes (PU) represent one of the most important polymer classes in everyday life, but experience severe challenges due to the safety issues of isocyanates. Moreover, the capability of employing bio-based raw materials is almost exclusively limited to polyol monomers. Non-isocyanate polyhydroxyurethanes (PHU), prepared by the polyaddition of environmentally benign cyclic carbonates and amine hardeners, hold great prospect to substitute PUs. Carbonated polyglycidylethers derived from bio-based polyols by chemical fixation of CO2 are among the most prominent examples of cyclic carbonates. According to the state-of-the-art there is a huge demand, especially within the PHU chemistry, for multifunctional and bio-based amine hardeners. Therefore, the aminolysis of polyglycidylethers and limonene dioxide with aqueous ammonia represents for the first time a versatile synthesis of multifunctional, bio-based -amino alcohols (AA) and does not require either organic solvents besides or tedious purification and leads to the identical feedstock for carbonates and amines. This study elucidates the influences of molecular architecture and amine content of multifunctional AA on the material properties and solvent swelling of PHUs