Adsorption Kinetics and Interfacial Dilational Properties of Fluorinated Hyperbranched Polymer at n-Decane/Water Interface

The dynamic interfacial tension of a series of novel hyperbranched fluoropolymer with different hydrophobic chain lengths at the n-decane/water interface is examined. The kinetics of adsorption of the polymers is analyzed with pure diffusion model and diffusion-reorientation model. The results show that at the earlier stages of adsorption, the transport of the fluoropolymer from the n-decane solution to the interface is governed by pure diffusion-controlled mechanism; at the end stages of adsorption, the mixed diffusion-reorientation mechanism is more reasonable in describing the adsorption kinetics. Moreover, the influences of oscillating frequency and bulk concentration on dilational properties are explored. The results show that the hydrophobic chain length of the polymer controls the nature of adsorption film and the film is elastic in nature. [GRAPHICS]