Highly Ordered Single Conjugated Polymer Chain Rod Morphologies
Takuji Adachi
Johanna Brazard
Paresh Chokshi
Joshua C. Bolinger
Venkat Ganesan
Paul F. Barbara
10.1021/jp108546w.s001
https://acs.figshare.com/articles/journal_contribution/Highly_Ordered_Single_Conjugated_Polymer_Chain_Rod_Morphologies/2706280
We have reexamined the fluorescence polarization anisotropy of single polymer chains of the prototypical conjugated polymer poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) isolated in a poly(methyl methacrylate) (PMMA) matrix employing improved synthetic samples that contain a much smaller number of tetrahedral chemical defects per chain. The new measurements reveal a much larger fraction of highly anisotropic MEH-PPV chains, with >70% of the chains exhibiting polarization anisotropy values falling in the range of 0.6−0.9. High anisotropy is strong evidence for a rod-shaped conformation. A comparison of the experimental results with coarse grain, beads on a chain simulations reveals that simulations with the usual bead−bead pairwise additive potentials cannot reproduce the observed large fraction of high polarization values. Apparently, this type of potential lacks some yet to be identified molecular feature that is necessary to accurately simulate the experimental results.
2010-12-09 00:00:00
polarization anisotropy values
chain simulations
tetrahedral chemical defects
fraction
fluorescence polarization anisotropy
Single Conjugated Polymer Chain Rod MorphologiesWe
polarization values
PMMA
polymer chains