Accession Number:

ADA280995

Title:

New Initiators for Controlled Radical Polymerization of Acrylic Monomers

Descriptive Note:

Technical rept.

Corporate Author:

CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF CHEMISTRY

Personal Author(s):

• Mardare, Daniela
• Matyjaszewski, Krzysztof

Report Date:

1994-06-30

Pagination or Media Count:

5.0

Abstract:

Polymerization of acrylic monomers was redox initiated by mixtures 11 of transition metal derivatives acetates, metallocenes with arenediazonium salts. In most cases, molecular weights increase with the conversion and polydispersities are lower than in a typical radical or anionic polymerization at these temperatures. Trapping experiments and relative monomer reactivities based on copolymerization studies indicate that these polymerizations proceed via a radical mechanism. The improved polymerization control can be ascribed to an equilibrium between growing radicals and dormant persistent radicals.

Descriptors:

• *METHYL RADICALS
• *POLYMERIZATION
• *MONOMERS
• *CHEMICAL RADICALS
• *METHACRYLATES
• BENZENE
• SALTS
• CHEMICAL EQUILIBRIUM
• ACETATES
• CHLORINE
• RHODIUM
• FLUOBORATES
• COBALT
• TRAPS
• OXIDATION REDUCTION REACTIONS
• ANIONS
• PHENYL RADICALS
• CHROMIUM
• CERIUM
• MOLECULAR WEIGHT
• TRANSITION METALS

Subject Categories:

• Inorganic Chemistry
• Physical Chemistry
• Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE