Accession Number : ADA315848

Title :   Multi-Functional Pi-Conjugated Macromolecules Based on Poly(Phenylene Vinylene). Dielectric Strengths/Dendritic Polymers.

Descriptive Note : Final rept. 15 Mar 93-14 Mar 96,

Corporate Author : MASSACHUSETTS UNIV AMHERST DEPT OF POLYMER SCIENCE AND ENGINEERING

Personal Author(s) : Karasz, Frank E.

PDF Url : ADA315848

Report Date : 15 AUG 1996

Pagination or Media Count : 38

Abstract : Numerous investigations of the synthesis, structures and properties of polyphenylene vinylene (PPV) and related macromolecules with novel electro-optical characteristics have been completed. Novel homopolymers and copolymers of varying architecture have been designed and synthesized and shown to be highly efficient chromophores in electroluminescent devices. Other polymers which have been synthesized and characterized include side-chain liquid crystalline systems with systematically varying mesogens, and novel high temperature - polyimides. The study of the phase behavior of polymer blends has continued with emphasis on sequence distribution effects in the respective copolymer constituent(s) and on detailed probes of the structure of miscible systems using advanced solid state NMR techniques. Dynamic light scattering studies of solvated flexible polymer chains in confined geometries (e.g. pores) have led to new insights into transport phenomena for such systems and to proposals for novel fractionation. A series of hyperbranched polyarylates have been prepared and studied with respect to their structure and properties both in solution and in the solid state, and in blends with linear chains. Additional theoretical investigating of transition, surface and bulk properties of single and multicomponent polymer systems including simulation studies have been completed.

Descriptors :   *POLYMERS, *MACROMOLECULES, *DIELECTRIC STRENGTH, *DENDRITIC STRUCTURE, SIMULATION, LIGHT SCATTERING, ELECTROOPTICS, SYNTHESIS, CHROMOPHORES, DYNAMICS, HIGH TEMPERATURE, ELECTROLUMINESCENCE, COPOLYMERS, PHASE STUDIES, MIXTURES, LIQUID CRYSTALS, TRANSPORT PROPERTIES, CHAINS, CONFINEMENT(GENERAL), SOLVATION, ARCHITECTURE, POLYIMIDE RESINS.

Subject Categories : Polymer Chemistry
      Organic Chemistry
      Crystallography
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE