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Synthesis and characterization of novel polythiourethane hardeners for epoxy resins |
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| Authors: | Krzysztof Strzelec Natalia Bączek Sylwia Ostrowska Karolina Wąsikowska Małgorzata Iwona Szynkowska Jacek Grams |
| Affiliation: | 1. Institute of Polymer and Dye Technology, Faculty of Chemistry, Lodz University of Technology, Stefanowskiego 12/16, 90-924 Lodz, Poland;2. Institute of General and Ecological Chemistry, Faculty of Chemistry, Lodz University of Technology, ?eromskiego 116, 90-924 Lodz, Poland |
| Abstract: | A novel thiol-terminated polythiourethanes were synthesized from low-molecular-weight di- and multifunctional mercaptans and diisocyanates and employed as curing agent of epoxy resin. The curing reaction of epoxy resin and thermal properties of cured products were investigated with differential scanning calorimetry. Evaluation of climatic ageing resistance was made by the change in mechanical properties. Mechanical studies indicated that the application of polythiourethane has toughening effect and significantly increases ageing resistance of the cured resins. The results of this study indicate that molecular structure and functionality of polythiourethane oligomers are of critical importance in governing the curing mechanism, structure of the network and final properties of epoxy compositions. |
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