Thiol-Michael bonds have recently been shown to exhibit dynamic, self-healing properties when incorporated into non-ionic, covalently crosslinked acrylic networks. Here, a dynamic thiol-Michael bond has been incorporated into a poly(ionic liquid) polyester network in order to gauge thermoresponsive behavior as a function of mechanical and conductive properties. Base-catalyzed carbon-Michael addition polymerization between an ionic liquid-containing diacetoacetate monomer and a mixture of diacrylates (including one containing the ‘dynamic’ thiol-Michael bond) was employed to prepare the desired network films. Crosslink density and Tg were controlled primarily via the acrylate:acetoacetate monomer ratio. To test the rehealing potential of the materials, the films were sliced, ‘rebonded’ and placed in a convection oven at 100 oC for anywhere between 1-24 hours. Tensile testing (dynamic mechanical analysis) was utilized to monitor the recovery of the mechanical properties as a function of time. Several of the PILs in the study were found to break at a place away from the reseal point while recovering &gt; 70 % of the stress and strain at break of the uncut ‘original’ sample. Stress relaxation and creep deformation of the rehealable PILs were also conducted and an analysis of these results will be discussed. Electrochemical impedance spectroscopy, utilizing a 4-electrode cell, indicated that the PIL polyester networks exhibited promising conductivities of 10-6 to 10-8 S/cm at 30 °C, much of which (&gt; 80 %) was found to be recovered as a result of the rehealing process.

Dynamic thiol-Michael bonds in poly(ionic liquid) polyester networks

255th National Meeting (2018)

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