Journal
POLYMER
Volume 213, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2020.123314
Keywords
Five-membered cyclic carbonate; Polyhydroxyurethane; Block copolymer; Shape memory; Reprocessing properties
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Funding
- National Natural Science Foundation of China [51973113, 51133003, 21774078]
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A novel five-membered cyclic carbonate compound was synthesized and used as the precursor for preparing PHU thermosets with improved thermomechanical properties and hydrophobicity. The nanostructured PHU thermosets showed enhanced T-g and mechanical properties compared to plain PHU thermosets, with significantly improved surface hydrophobicity. Introduction of PTFEA-b-PVPy maintained excellent shape memory and reprocessability in the nanostructured PHU thermosets.
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.
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