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Solvent and catalyst-free synthesis of sunflower oil based polyurethane through non-isocyanate route and its coatings properties
Ist Teil von
European polymer journal, 2018-05, Vol.102, p.161-168
Ort / Verlag
Oxford: Elsevier Ltd
Erscheinungsjahr
2018
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
[Display omitted]
•Non-isocyanate polyurethanes (NIPUs) are prepared from cyclic carbonate by reaction of it with amine.•The NIPU prepared at stoichiometric ratio exhibit good result than others.•The NIPU based on IPDA showed better physico-chemical properties than EDA and DETA.•The polymers exhibit suitable polymeric characteristics for coating purpose.
Bio-based Non-Isocyanate Polyurethanes (NIPUs) were synthesized by bulk polyaddition of diamine with carbonated sunflower oil (CSFO). Carbonated vegetable oils were obtained by solvent-free mixture reaction of CO2 with epoxidized sunflower oil under the conditions (120 °C, 50 bar) and characterized by FTIR, 1H NMR, and 13C NMR. Finally, the effect of the amine structure as well as CSFO/amine molar ratio (1:0.75, 1:1 and 1:2) on mechanical, and chemical properties NIPU’s were studied by using curing agents EDA (1,2-ethylenediamine), DETA (Diethyltriamine) and IPDA (Isophorone diamine). Except for IPDA based NIPU, it was seen that along with urethane formation, the amine group also reacted with ester groups to form amides. IPDA and EDA showed good thermal, mechanical, chemical and anticorrosive properties. Furthermore, DETA based NIPU displayed high elongation at break. These results highlight the potentiality of this environmentally friendly approach to prepare renewable NIPU materials for surface coatings purpose.