01853nas a2200157   4500008004100000022001400041245011000055210006900165260007100234300001600305490000800321520120300329100001901532700001701551856012701568       2009                        eng d  a1520-610600aPhotophysical investigation into the self-organization in pyrene-based urethane methacrylate comb polymer0 aPhotophysical investigation into the selforganization in pyreneb  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcSEP  a11887-118970 v1133 a<p>A side chain urethane methacrylate polymer with pendant pyrene units was synthesized and investigated for its self-organizing process in solution by UV-vis and fluorescence spectra and in film by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and fluorescence microscopy. The polymer exhibited excimer emission centered at 476 nm, even at very dilute concentrations (10(-6) M) as a consequence of the polymer design with pendant pyrene units on every side chain. A change in aggregation pattern was observed upon increasing the concentration to 10(-4) M. New red-shifted peaks appeared in the UV-vis absorption spectra and the I(E)/I(M) ratio, and the peak I/peak III ratio showed a break around 10(-4) M, suggesting formation of stable ground state aggregates. This was further confirmed by the SEM, TEM, AFM and fluorescence microscope studies, which showed the formation of vesicles in THF and giant spherical aggregates in THF/H(2)O. The change in pattern of aggregate formation with concentration also coincided with a sudden increase in the intensity of the hydrogen bonded urethane N-H peak with concentration as recorded by solution FT-IR studies in THF.</p>1 aDeepak, V., D.1 aAsha, S., K.  uhttps://library.ncl.res.in/content/photophysical-investigation-self-organization-pyrene-based-urethane-methacrylate-comb-0