NDLI: Conjugated Polymers Confined and Sheared : Photoluminescence and Absorption Dichroism in a Surface Forces Apparatus

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Conjugated Polymers Confined and Sheared : Photoluminescence and Absorption Dichroism in a Surface Forces Apparatus

Content Provider	Semantic Scholar
Author	Bae, Sung Chul Lin, Zhiqun Granick, Steve
Abstract	Within a surface forces apparatus newly equipped for spectroscopic measurements, the photoluminescence and absorption spectra were studied of conjugated polymer films confined to less than the random coil dimension. A dilute solution of MEH-PPV, poly(2-methoxy-5-(2-ethylhexyloxy)-1,4phenylenevinylene), was exposed to atomically smooth surfaces of muscovite mica and allowed to adsorb from toluene, and then the surface spacing was reduced to ≈2 nm, which is less than the unperturbed radius of gyration of the polymer chains. Subsequent unidirectional shear with amplitude ≈20 times the surface spacing provided preferential alignment while the solvent evaporated. Chain alignment was quantified from both photoluminescence and absorption spectra. Curiously, a bimodal distribution of chain alignment was observed, parallel to the shear direction in /3 of the cases but perpendicular to the shear direction in /3 of the cases. On the basis of analysis of the photoluminescence spectra, confinement and shear-induced changes of the electronic structure are also discussed. This is considered to be the first study of polymer absorption and photoluminescence spectra within the contact area of a surface forces apparatus.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://groups.mrl.illinois.edu/granick/Publications/PDF%20files/2005/Sung%20Chul_Macromolecules.pdf
Language	English
Access Restriction	Open
Subject Keyword	Alignment Bone structure of radius Coil Device Component Dichroism Electronic structure Evaporation Immunostimulating conjugate (antigen) Less Than Microsomal Epoxide Hydrolase Photoluminescence Polymer Toluene Waveplate
Content Type	Text
Resource Type	Article

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