Improvement of epoxy thermosets using a thiol‐ene based polyester hyperbranched polymer as modifier |
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| Authors: | David Foix Xavier Ramis Francesc Ferrando Angels Serra |
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| Affiliation: | 1. Department of Analytical and Organic Chemistry, University Rovira i Virgili, C/Marcel lí Domingo s/n, 43007 Tarragona, Spain;2. Thermodynamics Laboratory, ETSEIB University Politècnica de Catalunya, C/Av. Diagonal 647, 08028 Barcelona, Spain;3. Department of Mechanical Engineering, University Rovira i Virgili, C/Pa?sos Catalans 26, 43007 Tarragona, Spain |
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| Abstract: | The anionic curing initiated by 1‐methyl imidazole of diglycidyl ether of bisphenol A with a hyperbranched polymer (HBP) containing long aliphatic chains in the structure were studied. The hydroxyl groups present as chain ends in the HBP structure played an important role in the curing kinetics, as demonstrated by differential scanning calorimetry, Fourier transform infrared spectroscopy and rheological studies. Properties such as shrinkage on curing and thermomechanical characteristics were also investigated. The structure of the HBP, which contains long aliphatic chains and reactive hydroxyl groups as chain ends, flexibilizes the network significantly, improving the impact resistance without notably affecting either the glass transition temperature or the microhardness of the modified thermosets. Copyright © 2012 Society of Chemical Industry |
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| Keywords: | epoxy resin hyperbranched toughness thermosets |
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