Journal
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
Volume 50, Issue 4, Pages 250-256Publisher
WILEY-BLACKWELL
DOI: 10.1002/polb.23000
Keywords
fluorescence; miscibility; phase separation; poly(vinyl methyl ether); polymer blends; polystyrene; weak hydrogen bonds
Categories
Funding
- Emory University
- URC
Ask authors/readers for more resources
We have investigated the fluorescence emission spectra of pyrene and anthracene dyes covalently bonded to polystyrene (PS) upon phase separation from poly(vinyl methyl ether) (PVME). The specific chemical structure of the fluorescent labels is found to affect the measured phase separation temperature TS, with fluorophores covalently attached in closer proximity to the PS backbone identifying phase separation a few degrees earlier. The sharp increase in fluorescence intensity upon phase separation that occurs for all fluorophores with little change in spectral shape is consistent with a mechanism of static fluorescence quenching resulting from the specific interaction with a nearby quenching molecular unit. Based on recent work that has identified a weak hydrogen bond occurring between the aromatic hydrogens of PS and the ether oxygen of PVME, we believe a similar weak hydrogen bond is likely occurring between the PVME oxygen and the aromatic dyes providing a local (few nanometer) sensitivity to phase separation. (C) 2011 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2011
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available