2018 Volume 22 Issue 3 Pages 71-78
We prepared clay and polyethylene glycol-modified lignin (GL) nanocomposite films to optimize a preparation condition reported elsewhere (Kaneko et al., 2016). In the preparation, we used H2O and acetonitrile mixed solvent, while we previously used H2O and N-metyl-2-pyrrollidone (NMP) mixed solvent. The films were obtained by annealing at 523 K, which is a 50 K lower value than that of the films previously reported. Furthermore, the UL94 rating of the resultant films was V-0, indicating flame retardancy due to the negligible amount of residual volatile organic contents, while the films using H2O and NMP mixture did not show flame resistance. The dry-gas and moisture barrier properties of the films were comparable to the films using H2O and NMP mixed solvent. Consequently, we found that the clay-glycol lignin nanocomposite films using H2O and ACN mixed solvent were successfully prepared with good flame retardancy and high moisture barrier properties under the milder annealing condition.
