Accession Number : ADA295793

Title :   Synthesis of Well Defined Polymers by Controlled Radical Polymerizations.

Descriptive Note : Technical rept.,

Corporate Author : CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF CHEMISTRY

Personal Author(s) : Matyjaszewski, Krzysztof ; Gaynor, Scott ; Greszta, Dorota ; Mardare, Daniela ; Shigemoto, Takeo

PDF Url : ADA295793

Report Date : 30 JUN 1995

Pagination or Media Count : 19

Abstract : Controlled radical polymerizations can be achieved by using either unimolecular or bimolecular exchange between growing radicals and dormant chains. Dormant chains can be represented as either covalent species or organometallic compounds. Systems based on alkoxyamines, organochromium, organoaluminum compounds, and alkyl iodides are discussed in detail. In many systems, straight semilogarithmic plots indicate a constant number of growing radicals. A linear increase of molecular weights with conversion indicates a constant number of chains capable of growth but being predominantly in the dormant state. Some of these systems can be used in the synthesis of block copolymers and for end-functionalization. (AN)

Descriptors :   *POLYMERIZATION, ALUMINUM COMPOUNDS, EXCHANGE REACTIONS, POLYMERS, COVALENT BONDS, BLOCK COPOLYMERS, MOLECULAR WEIGHT, SYNTHESIS(CHEMISTRY), ORGANOMETALLIC COMPOUNDS, AMINES, CONCENTRATION(COMPOSITION), MOLECULE MOLECULE INTERACTIONS, CHAIN REACTIONS, ALKYL RADICALS, CHROMIUM COMPOUNDS, ALKOXY RADICALS, MOLECULAR IONS, IODIDES, DORMANCY.

Subject Categories : Polymer Chemistry
      Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE