Accession Number : ADA184018

Title :   Wittig Synthesis of Conductive Segmented Block Polymer Compositions.

Descriptive Note : Technical rept.,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK PA POLYMER SCIENCE SECTION

Personal Author(s) : Hans,Paul J ; Gordon,Bernard , III

PDF Url : ADA184018

Report Date : 01 Aug 1987

Pagination or Media Count : 5

Abstract : Conducting polymers such as polyacetylene and polyparaphenylene have been shown to have electrical conductivities which vary from the insulator to semiconductor and metallic regimes upon doping with electron acceptor or donor molecules. Unfortunately, many of these materials are plagued by undesirable properties such as oxidative instability (in the case of polyacetylene) and intractability or infusibility. Researchers have attempted improvements of the physical properties and environmental stability of polyacetylene by blending with elastomers, preparing composites with polyethylene film, and synthesizing block and graft copolymers. Some enhancements of the physical properties of the materials (eg. mechanical behavior, solubility behavior) compared to polyacetylene were generally observed. Electrical conductivities were generally less than for pure polyacetylene although stretching blend films was observed to enhance the conductivity, often by an order of magnitude over the unstretched film. In this paper we reported on the preparation of segmented block polymers prepared via a Wittig condensation of conductive poly(p-phenylene pentadienylene) oligomers and linear alkanes. It is felt that preparation of segmented block polymers will result in conductive materials with good mechanical properties providing phase morphology and size can be controlled.

Descriptors :   *GRAFT POLYMERIZATION, *ELECTRICAL CONDUCTIVITY, *BLOCK POLYMERS, MOLECULES, ELASTOMERS, ELECTRON ACCEPTORS, MECHANICAL PROPERTIES, POLYMERS, MORPHOLOGY, DOPING, ENVIRONMENTS, STABILITY, ALKANES, METALS, OXIDATION, STABILITY, PHYSICAL PROPERTIES, PHASE TRANSFORMATIONS, SYNTHESIS(CHEMISTRY), ARYL RADICALS, POLYCYCLIC COMPOUNDS, CONDENSATION REACTIONS, POLYPHENYLENES, ANIONS, SOLUBILITY, SEGMENTED

Subject Categories : Polymer Chemistry
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE