Abstract
The dynamic surface tension of aqueous solutions of ethyl(hydroxyethyl)cellulose (EHEC) was measured using the pendant-drop method and digital-image analysis. The EHEC concentrations studied ranged from 3.2·10−5to 0.28% w/w. The time dependence of surface tension was analyzed using a diffusion-kinetics-controlled theory where the adsorption kinetics depended on the fraction of the total surface coverage. For EHEC concentrations ≤10−3% w/w, the isotherms showing surface tension vs log time follow a sigmoidal pattern. Three consecutive kinetic regions exist: the induction region, the surface-coverage region, and the mesophase region. The process of the adsorption of polymer segments is described in terms of relaxation times and the critical points of time, at the onset and at the end of the region of surface coverage. An extremely slow surface equilibration in the mesophase region indicates a progressive ordering of the polymer segments within the surface layer.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
