Accession Number:

ADA280799

Title:

Preparation of Well Defined Polystyrene-Block-Poly (Methylphenylsilylene) Copolymers

Descriptive Note:

Technical rept.

Corporate Author:

CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF CHEMISTRY

Personal Author(s):

• Fossum, Eric
• Matyjaszewski, Krzysztof

Report Date:

1994-06-30

Pagination or Media Count:

4.0

Abstract:

Combination of the living anionic polymerization of styrene with the ring opening polymerization of cyclotetrasilanes affords the preparation of well-defined polystyrene-block-polymethylphenylsilylene. Block copolymers with ratios of polystyrene to polysilylene, PSPMPS ranging from 14 to 21 have been prepared. The molecular weight distributions are narrow, MwMn 1.3. Removal of any homo polystyrene can be accomplished by precipitation into acetone yielding pure block copolymers with known compositions. The materials have been characterized by 1H and 29Si NMR spectroscopy, Gel Permeation Chromatography, and Differential Scanning Calorimetry.

Descriptors:

• *METHYL RADICALS
• *BLOCK COPOLYMERS
• *PHENYL RADICALS
• *POLYSTYRENE
• SCANNING
• STYRENE PLASTICS
• PRECIPITATION
• ACETONES
• CALORIMETRY
• GEL PERMEATION CHROMATOGRAPHY
• ANIONS
• MONOMERS
• SILICON
• HYDROGEN
• NUCLEAR MAGNETIC RESONANCE
• POLYMERS
• SPECTROSCOPY

Subject Categories:

• Organic Chemistry
• Physical Chemistry
• Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE