Investigation on kinetic processes of fabrication of honeycomb-patterned polystyrene film and adsorption of surfactant by quartz crystal microbalance in impedance analysis method

摘要

In this work, the kinetic processes of fabrication of honeycomb-patterned polystyrene (PS) porous film by a breath figures method and the adsorption of sodium dodecyl benzene sulfonate (SDBS) onto the PS films were monitored by a quartz crystal microbalance technique. Three distinct viscoelastic behaviors of PS film were observed. The viscosity of PS film was increased slightly in the initial liquid film stage, reached a maximum in the middle of the viscous film stage, then decreased significantly in the end of rigid film stage. Compared with a flat PS film, the porous PS film had a shorter liquid film stage but a longer viscous film stage. The adsorption processes of SDBS onto the PS films were approximated favorably by the pseudo-second-order kinetic model. The adsorption rate constants onto flat film are 9.8-27 times of those onto porous film. The adsorption isotherms were well fitted by the Langmuir isotherm model. The adsorption equilibrium constant and capacity are 1.29 × 10~4 L/mol and 29.7 mg/g onto flat PS film, 6.85 × 10~3 L/mol and 375.8 mg/g onto porous PS film, respectively.