Polyurethane/Nitrogen-Doped Graphene Quantum Dot (N-GQD) nanocomposites: synthesis, characterization, thermal, mechanical and shape memory properties

A series of polyurethane-based nanocomposites with different contents of N-GQD nanoparticles were prepared via solution casting and in-situ polymerization methods. Hydrogen bonding content of carbonyl groups (HBI(C=O)) of samples were studied by FTIR. Crystalline structure and thermal behavior of samples were investigated by XRD and DSC. Incorporating of N-GQDs in PU matrix can affect the HBI(C=O) and degree of crystallinity. The FESEM images illustrate N-GQD nanoparticles have uniform dispersion in samples obtained by in-situ polymerization. Shape memory behavior was examined at room temperature and 60 degrees C. Both PU nanocomposites preparation methods and nanoparticles content have significant effect on thermo-mechanical properties. [GRAPHICS]