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.

Report Date:

1995-06-30

Pagination or Media Count:

30.0

Abstract:

Polystyrenepolymethylphenylsilylene and polyisoprenepolymethylphenyl 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 MwMn 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 lH and 29Si 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