Accession Number:

ADA295862

Title:

Unimolecular and Bimoleculare Exchange Reactiions in Controlled Radical Polymerization.

Descriptive Note:

Technical rept.,

Corporate Author:

CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF CHEMISTRY

Personal Author(s):

• Matyjaszewski, K.
• Gaynor, S.
• Greszta, D.
• Mardare, D.
• Shigemoto, T.

Report Date:

1995-06-30

Pagination or Media Count:

17.0

Abstract:

Well defined polymers can be produced by radical polymerization using three different approaches degenerative, transfer, reversible homolytic cleavage of covalent species, and reversible homolytic cleavage of persistent radicals. The first method requires high degenerative transfer coefficients but allows for slow initiation the other two methods require that the equilibrium be strongly shifted towards dormant species, and that initiation is fast. All three approaches may provide controlled polymerizations, but not living polymerizations, because chain breaking reactions can not be eliminated although their contribution can be strongly reduced.

Descriptors:

• *POLYMERS
• *POLYMERIZATION
• *MOLECULAR BIOLOGY
• CONTROL
• COVALENT BONDS
• REVERSIBLE
• LIFE(BIOLOGY)
• CHAIN REACTIONS
• CLEAVAGE
• HOMOGENEITY
• DORMANCY

Subject Categories:

• Polymer Chemistry
• Genetic Engineering and Molecular Biology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE