Abstract
The behavior of end-adsorbed bimodal PS–PEO block copolymer systems was studied with neutron reflectivity experiments, both under static conditions (zero shear rate) and under a stepwise-increasing shear flow, up to a critical shear rate where desorption occurs. It is found that when the height of one kind of chain in the bimodal brush is significantly greater than that of the other, the longer chains desorb first, while if the heights of the two constituent kinds of chains in the brush are similar, then the bimodal system responds as a whole and both kinds of chain desorb simultaneously. In particular, when the chain height ratio of the two components of the bimodal system is less than 0.80, the reflectivity spectra under static conditions are best fitted by two parabolas, and under shear flow each component desorbs at a different shear rate. Above this value, the bimodal system reacts en bloc, and desorption occurs at the same shear rate for both copolymers. It is further observed that the critical shea...
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.
