Effect of NCO/OH ratio and Ce-Zr nanoparticles on the thermo-mechanical properties of hyperbranched polyurethane urea coatings

Corrosion inhibition of functional graphene reinforced polyurethane nanocomposite coatings with regular textures

The schematic was drawn to intuitively describe the anti-corrosion mechanism of functional graphene reinforced polyurethane nanocomposite coatings with regular textures.

Synthesis of a novel glycerol based B3-type monomer and its application in hyperbranched polyester urethane–urea coatings

Renewable based poly(urethane–urea) coatings with high thermal stability (T_g – 124.9) were prepared from hyperbranched polyester polyol with the degree of branching almost equal to 66%.

Excellent tribological and anti-corrosion performance of polyurethane composite coatings reinforced with functionalized graphene and graphene oxide nanosheets

The mechanism figure was drawn to intuitively explain the function of the FG and FGO in PU matrix during tribological and corrosion process.

Synthesis and characterization of novel hydroxyl-terminated hyperbranched polyurethanes

A series of novel hydroxyl-terminated hyperbranched polyurethanes (HBPUs) were synthesized via stepwise polymerization by diethanolamine (DEOA), isophorone diisocyanate (IPDI) and trimethylolpropane (TMP). It is interesting to note that the HBPUs can be purified by water. The HBPUs were characterized with 1H nuclear magnetic resonance (NMR), 13C NMR, Fourier transform infrared spectroscopy (FT-IR) and elemental analysis. The average degree of branching (DB) of HBPUs was calculated from the first generation to the fourth generation to be 1.00, 0.74, 0.59 and 0.57 by quantitative 13C NMR, respectively. The branching model and molecular structure of HBPUs were deduced by the 13C NMR and the value of DB. To investigate the changes of hydrogen bonding interaction in HBPUs with a variation in structure of different generations, the deconvolution of FT-IR spectra was carried out using Origin 7.0 software through the Gaussian curve-fitting method. The ratio of hydrogen-bonded -NH and -OH groups of HBPUs was calculated to be 80.8%, 85.1%, 84.8% and 85.4% from the first generation to the fourth generation by deconvoluted -NH and -OH zone, respectively. The interaction of hydrogen bonding and glass transition temperature (Tg) of HBPUs increased with the increase of generation. The trend of thermal stability and Tg coincide with the change of hydrogen-bonded interactions.