Polyhydroxyurethane Thermosets From Novolac Epoxide: Synthesis And Its Nanostructured Blends With Poly(Trifluoroethylacrylate)-Block-Poly (N-Vinylpyrrolidone) Diblock Copolymer

A novel five-membered cyclic carbonate compound was synthesized via the reaction of novolac epoxide with carbon dioxide. The cyclic carbonate was then used as the precursor to prepare polyhydroxyurethane (PHU) thermosets with a trifunctional polyetheramine (i.e., Jeffamine T 403) as the crosslinking agent. To improve the thermomechanical properties as well as hydrophobicity, the PHU thermosets were further nanostructured by the use of a poly(trifluoroethyl acrylate)-block-poly(N-vinylpyrrolidinone) (PTFEA-b-PVPy) diblock copolymer. Compared to plain PHU thermoset, the nanostructured thermosets displayed enhanced glass transition temperatures (T-g's) and mechanical properties. Meanwhile, the surface hydrophobicity was significantly improved; the water surface contact angles of the thermosets have been increased up to 94.6 degrees. With the introduction of PTFEA-b-PVPy, the nanostructured PHU thermosets still preserved the excellent shape memory and reprocessability at elevated temperature.