Abstract
Thiol–epoxy–acrylate hybrid polymer networks (HPNs) are formed by the combination of nucleophilic thiol–acrylate Michael addition and thiol–epoxy coupling reactions catalyzed by 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) in a one-pot synthesis. A stoichiometric balance between thiol groups (multifunctional thiols with a thiol functionality greater than two) and the addition of epoxide (difunctional epoxy) and acrylate groups (difunctional acrylate) is applied in the reactant mixture. Full conversion is achieved based on the disappearance of the thiol absorbance peak from Fourier transform infrared spectroscopy, demonstrating the high efficiency of thiol–click reactions. With relatively high molecular weight (MW = 2000 g mol–1) acrylates, novel phase-separated, thiol-based hybrid materials are obtained, as evidenced by the presence of two glass transition temperatures from both differential scanning calorimetry and dynamic mechanical analysis as well as morphology characterization by scanning electron micros...
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