Accession Number : ADA295983

Title :   Synthesis and Characterization of Polystyrene-Block-Poly(Methylphenylsilylene) and Polyisoprene-Block-(Polymethylphenylsilylene).

Descriptive Note : Technical rept. ,

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

Personal Author(s) : Matyjaszewski, K. ; Fossum, E. ; Love, J. A.

PDF Url : ADA295983

Report Date : 30 JUN 1995

Pagination or Media Count : 30

Abstract : Polystyrene/poly(methylphenylsilylene) and polyisoprene/poly(methylphenyl silylene) block copolymers were prepared by two independent methods. Subsequent additions of solutions of cyclotetrasilanes in benzene to the living ends of polystyrene and polyisoprene resulted in the formation of well-defined block copolymers with narrow molecular weight distributions (Mw/Mn < 1.3). Condensation of the living ends of polyisoprene and polystyrene with bromide end-terminated polysilanes also resulted in the formation of block copolymers. The materials were characterized by (l)H and (29)Si NMR, GPC, DSC, and elemental analysis. jg p.2

Descriptors :   *BLOCK COPOLYMERS, *POLYSTYRENE, *ISOPRENE, SCANNING, BENZENE, NUCLEAR MAGNETIC RESONANCE, METHYL RADICALS, DISTRIBUTION, SYNTHESIS, POLYMERS, MOLECULAR WEIGHT, HYDROGEN, SILANES, PHENYL RADICALS, BROMIDES, CHEMICAL ANALYSIS, CONDENSATION, CALORIMETRY, GEL PERMEATION CHROMATOGRAPHY.

Subject Categories : Polymer Chemistry
      Organic Chemistry
      Radiation and Nuclear Chemistry
      Atomic and Molecular Physics and Spectroscopy
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE