A dynamic hard domain-induced self-healable waterborne poly(urethane/acrylic) hybrid dispersion for 3D printable biomedical scaffolds

Abstract

Polyurethane (PU) with its efficient self-healing ability and high mechanical properties is highly anticipated but an arduous challenge to achieve. In this study, to create a win-to-win situation, a new...

Photoluminescent Self-Healable Waterborne Polyurethane/Mo and S Codoped Graphitic Carbon Nitride Nanocomposite with Bioimaging and Encryption Capability

“…A perusal of 1 H NMR spectrum of the NCOterminated prepolymer is shown in Figure S1, and the presence of the free isocyanate groups was already evaluated using infrared (IR) analysis in one of our previous work. 30 In addition to various peaks, the most significant characteristic peaks were observed near δ = 7.95 ppm (m, NH) which can be accredited to the protons attached with the N atom of urethane linkage. However, FTIR spectra of SHWPU/NS nanocomposites (Figure 3a) demonstrated the absence of a vibrational peak near 2250−2270 cm −1 corresponding to the free −NCO group.…”

“…The biobased chain extender, i.e., MG CO , was prepared via glycerolysis of CO following a previous report. 30 10 mM CO, 20 mM glycerol, and 0.0046 g of CaO were mixed in a three-neck round-bottom flask attached with a nitrogen inlet, a thermometer, and a mechanical stirrer. The glycerolysis reaction was performed at 225 ± 2 °C for 1.5−2 h and its completion was verified by the solubility test of the product in methanol (three-time w.r.t.…”

“…According to an earlier report, the biobased internal emulsifier GECA was prepared from CA and glycerol (1:2 molar ratio) using p -TSA (0.5 wt % of citric acid) as the catalyst to enhance the rate of the esterification reaction …”

“…The biobased chain extender, i.e., MG CO , was prepared via glycerolysis of CO following a previous report . 10 mM CO, 20 mM glycerol, and 0.0046 g of CaO were mixed in a three-neck round-bottom flask attached with a nitrogen inlet, a thermometer, and a mechanical stirrer.…”

“…According to an earlier report, the biobased internal emulsifier GECA was prepared from CA and glycerol (1:2 molar ratio) using p-TSA (0.5 wt % of citric acid) as the catalyst to enhance the rate of the esterification reaction. 30 Preparation of the Biobased Chain Extender or Monoglyceride of Castor Oil. The biobased chain extender, i.e., MG CO , was prepared via glycerolysis of CO following a previous report.…”