Synthesis of Star Polymers via Nitroxide Mediated Free-Radical Polymerization: A 'Core-First' Approach Using Resorcinarene-Based Alkoxyamine Initiators
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CONTRIBUTORS:
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JOURNAL:
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Journal of Polymer Science, Part A: Polymer Chemistry,
45(??),
5559 -
5572.
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YEAR:
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2007
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PUB TYPE:
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Journal Article
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SUBJECT(S):
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alkoxyamine; block copolymers; initiators; nitroxide-mediated radical
polymerization; resorcinarene; star polymers
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DISCIPLINE:
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Chemistry
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HTTP:
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http://www3.interscience.wiley.com/journal/36444/home
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LANGUAGE:
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English
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PUB ID:
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103-438-985
(Last edited on
2007/12/02 14:30:41 US/Mountain)
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SPONSOR(S):
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ABSTRACT:
The synthesis of new octafunctional alkoxyamine initiators for nitroxidemediated
radical polymerization (NMRP), by the derivatization of resorcinarene with
nitroxide free radicals viz TEMPO and a freshly prepared phosphonylated nitroxide,
is described. The efficiency of these initiators toward the controlled radical polymerization
of styrene and tert-butyl acrylate is investigated in detail. Linear analogues of
these multifunctional initiators were also prepared to compare and evaluate their initiation
efficiency. The favorable conditions for polymerization were optimized by varying
the concentration of initiators and free nitroxides, reaction conditions, etc., to
obtain well-defined star polymers. Star polystyrene thus obtained were further used
as macro-initiator for the block copolymerization with tert-butyl acrylate.
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