Molecular rotor dynamics influenced by the elastic modulus of polyethylene nanocomposites.
We observed that the excited-state twisting motion of 3,3(')-diethyloxacarbocyanine in polymer nanocomposites (PNCs) depends strongly on the elastic modulus of medium. PNCs consist of low density polyethylene dispersed with surface-functionalized nanodiamonds with various alkyl groups. The mechanical properties of the PNCs were measured by a nanoindentation method, and the photoisomerization processes of the cyanine dye doped in the composites were investigated by time-resolved fluorescence spectroscopy. It was found that the molecular rotor dynamics in rigid media should be quantitatively describable by the elastic modulus of polymer.
Jee
Ah-Young
AY
Department of Chemistry and Nanoscience, Ewha Womans University, Seoul 120-750, Republic of Korea.
Kwon
Haneul
H
Lee
Minyung
M