Abstract
A nearly monodisperse polystyrene-block-poly(p-hydroxystyrene) copolymer (PS-PSOH) was synthesized by combining protected group chemistry with high-vacuum anionic polymerization. The molecular weight of both blocks was 1.0×10 4 . Our objective was to study the effect of hydrogen bonding on micelle formation in block copolymer solutions. The self-hydrogen-bonding capability of the hydroxystyrene moieties is well established. Light scattering experiments were conducted on dilute solutions of PS-PSOH in tetrahydrofuran (THF), a common solvent for both blocks, and toluene, a selective solvent for the polystyrene block. Dynamic light scattering (DLS) measurements indicated that the block copolymer was molecularly dispersed (or nearly so) in THF with a hydrodynamic radius R h =3.8 nm. However, large aggregates with R h =76 nm were observed by DLS in toluene solutions. Static light scattering (SLS) measurements on the PS-PSOH/toluene solutions confirmed the presence of large aggregates with aggregation numbers of 10 4 chains/micelle. The micellar structure was determined by enforcing simultaneous consistency with both SLS and DLS measurements. A rodlike structure, 300 nm in length and 40 nm in diameter, is consistent with both measurements
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.
