This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Faculty of Technology, University of Novi Sad , Novi Sad , Serbia
Faculty of Technology, University of Novi Sad , Novi Sad , Serbia
Faculty of Technology, University of Novi Sad , Novi Sad , Serbia
Faculty of Technology, University of Novi Sad , Novi Sad , Serbia
Faculty of Technology, University of Novi Sad , Novi Sad , Serbia
Institute of Macromolecular Chemistry AS CR v.v.i. , Prague
Chemistry Department, Engineering Faculty, Istanbul University-Cerrahpaşa , Istanbul , Turkey
In this paper, the influence of thermoplastic segmented polyurethanes on the curing kinetics of epoxy based hybrid materials was assessed. Samples were prepared with diglycidil ester bisphenole A epoxy resin and different content (10, 15 and 20 wt. %) of thermoplastic segmented polyurethanes with different content of hard segments (20, 25 and 30 wt. %) based on aliphatic polycarbonate macrodiols, hexamethylene diisocyanate and chain extender 1,4-butanediol using the catalyst, dibutyltin dilaurate, and also a sample without added elastomeric polyurethane. All samples were cured with hardener Jeffamine D-2000. The curing of the epoxy hybrid materials were investigated by non-isothermal differential scanning calorimetry (DSC). Using data obtained from DSC, five isoconversion models were applied to determine the effect of polyurethane elastomer content, as well as the content of hard segments in polyurethane, on the crosslinking reaction of the material. Results showed that for hybrid materials with a higher content of segmented polyurethanes (10 and 15 wt. %), curing process starts at lower temperatures and the maximal speed is achieved at lower temperatures. The highest change in total enthalpy of the crosslinking reaction is determined for the epoxy based hybrid material with polyurethanes containing 30 wt. % of hard segment. It was concluded, that the knowledge of the curing kinetics is important for the selection of optimal fabrication conditions and processing parameters for epoxy based hybrid materials in industrial conditions.
The statements, opinions and data contained in the journal are solely those of the individual authors and contributors and not of the publisher and the editor(s). We stay neutral with regard to jurisdictional claims in published maps and institutional affiliations.
