UV-visible spectroscopic study on multi-staged film formation mechanisms of graphene oxide-doped polystyrene latex (PS latex/GO) nanocomposites


Etemadi A., Demirbay B., Uğur Ş.

TURKISH JOURNAL OF CHEMISTRY, vol.45, no.3, pp.892-904, 2021 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 45 Issue: 3
  • Publication Date: 2021
  • Doi Number: 10.3906/kim-2102-30
  • Title of Journal : TURKISH JOURNAL OF CHEMISTRY
  • Page Numbers: pp.892-904

Abstract

We report the effect of graphene oxide (GO) on film formation and morphological properties of GO-doped polystyrene (PS) latex nanocomposite (PS latex/GO) films using UV-visible absorption spectroscopy and scanning electron microscopy (SEM). PS latex particles were synthesized through emulsion polymerization technique and then nanocomposite blends, each containing different concentrations of GO ranging from 0 wt% to 70 wt%, were obtained. Prepared blends were deposited on glass plates via drop-casting method, and coated substrates were annealed at different temperatures between 100 degrees C and 250 degrees C. At each annealing temperature, transmitted light intensity of nanocomposite films was recorded. Void closure and Prager-Tirrell models were employed to interpret the film formation behavior. Activation energy of viscous flow (Delta H) decreased from 21.80 kcal.mol(-1) to 5.91 kcal.mol(-1) when the amount of GO content increased in film composition. However, activation energy of interdiffusion (Delta E) varied between 1.08 kcal.mol(-1) and 6.94 kcal.mol(-1) without any trend upon the addition of GO nanofillers. SEM images of films agreed well with calculated activation energies. Although the interdiffusion process of GO-doped latex films remained unaffected by added GO nanofillers, optical transparency of the films enhanced up to 92.5%, demonstrating that thermally resistant and highly transparent GO-rich nanocomposite films can be fabricated.