Synthesis and characterization of star polymers with varying arm number, length, and composition from organic and hybrid inorganic/ organic multifunctional initiators

Krzysztof Matyjaszewski, Peter J. Miller, Dong-Chul Pyun, Guido Kickelbick, Stephen Diamanti

Research output: Contribution to journalArticle

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Abstract

Multifunctional initiators, derived from cyclotriphosphazenes, cyclosiloxanes, and organic polyols, were used in the synthesis of styrenic and (meth)acrylic star polymers by atom transfer radical polymerization (ATRP). Conditions were identified in each system which provided linear first-order kinetics for polymers with narrow, monomodal molecular weight distributions. Molecular weight measurements relative to linear polystyrene standards showed that the star polymers had lower molecular weights than theoretically predicted. Triple detection SEC measured on poly(n-butyl acrylate) samples demonstrated that the absolute molecular weight matched the theoretical value-the smaller relative chain length was due to lower hydrodynamic volumes of the star-branched polymers relative to linear analogues. Kinetic arguments were used to demonstrate that each alkyl halide moiety bound to the initiators was participating in ATRP. Well-defined poly(methyl acrylate) stars of molecular weights Mn > 500 000 and low polydispersity (Mw/Afn < 1.2) have been prepared. Star-block copolymers with a soft poly(methyl acrylate) core and a hard poly(isobornyl acrylate) shell were also synthesized.

Original languageEnglish (US)
Pages (from-to)6526-6535
Number of pages10
JournalMacromolecules
Volume32
Issue number20
StatePublished - Oct 5 1999
Externally publishedYes

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Stars
Polymers
Molecular weight
Chemical analysis
Atom transfer radical polymerization
Kinetics
Polyols
Polystyrenes
Polydispersity
Weighing
Molecular weight distribution
Chain length
Block copolymers
Acrylics
Hydrodynamics
methyl acrylate

ASJC Scopus subject areas

  • Materials Chemistry

Cite this

Synthesis and characterization of star polymers with varying arm number, length, and composition from organic and hybrid inorganic/ organic multifunctional initiators. / Matyjaszewski, Krzysztof; Miller, Peter J.; Pyun, Dong-Chul; Kickelbick, Guido; Diamanti, Stephen.

In: Macromolecules, Vol. 32, No. 20, 05.10.1999, p. 6526-6535.

Research output: Contribution to journalArticle

Matyjaszewski, Krzysztof ; Miller, Peter J. ; Pyun, Dong-Chul ; Kickelbick, Guido ; Diamanti, Stephen. / Synthesis and characterization of star polymers with varying arm number, length, and composition from organic and hybrid inorganic/ organic multifunctional initiators. In: Macromolecules. 1999 ; Vol. 32, No. 20. pp. 6526-6535.
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AU - Diamanti, Stephen

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