Accession Number : ADA294825

Title :   Electroactive and Photoactive Rod-Coil Copolymers: Design, Synthesis, and Supramolecular Regulation of Photophysical Properties.

Descriptive Note : Technical rept.,

Corporate Author : ROCHESTER UNIV NY DEPT OF CHEMICAL ENGINEERING

Personal Author(s) : Osaheni, John A. ; Jenekhe, Samson A.

PDF Url : ADA294825

Report Date : 26 MAY 1995

Pagination or Media Count : 70

Abstract : Two series of electroactive and photoactive rod-coil copolymers have been designed, synthesized, and investigated to explore a new structural motif for organizing molecular and macromolecular materials at the supramolecular structure level for enhanced functional and solid state photophysical properties. The rod-coil copolymers consisting of electroactive and photoactive rodlike conjugated segments and inactive coillike segments, exemplified by poly(1,4-phenylene benzobi sthiazole-co-decamethylene benzobisthiazole) and poly( 1 ,4-phenylenebisvinylene benzobisthiazole-co-decamethylene benzobisthiazole), have semi-flexible (semi-rigid) chains whose flexibility (rigidity), folding, intermolecular interactions, and packing, and hence the solid state supramolecular structure and photophysical properties of the materials, are regulated by copolymer composition. The molecular structure, chain sequence lengths, and copolymer composition were determined by NMR (1H, 13C), FTIR, and UV-Visible spectra. The sequence length distribution of the conjugated rodlike segments predicted from the copolymerization statistics was in good agreement with the 1H NMR results. It is shown that nanocomposites are formed at rod molar fractions of less than 0.5 which also marks a dramatic change in the photophysical properties of the copolymers. The photoluminescence quantum yield varied with copolymer composition, reaching over 6- and 7-fold enhancements compared to the "bulk" pure conjugated polymers. jg

Descriptors :   *COPOLYMERS, ULTRAVIOLET RADIATION, INTERACTIONS, SYNTHESIS, PHYSICAL PROPERTIES, POLYMERS, COMPOSITE MATERIALS, QUANTUM THEORY, PHOTOLUMINESCENCE, STATISTICS, SEQUENCES, PURITY, SPECTRA, CHAINS, YIELD, ORGANIC COMPOUNDS, VISIBLE SPECTRA, MACROMOLECULES, MOLECULAR STRUCTURE, MOLECULE MOLECULE INTERACTIONS, COPOLYMERIZATION.

Subject Categories : Polymer Chemistry
      Organic Chemistry
      Laminates and Composite Materials
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE