Synthesis of Star-like Random Copolymers from Resorcinarene-Based Octa-Functional Alkoxyamine Initiator via Nitroxide Mediated Free Radical Polymerization
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CONTRIBUTORS:
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JOURNAL:
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Macromolecular Research,
15 (4),
324 -
329.
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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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controlled polymerization, methyl methacrylate, nitroxide-mediated radical polymerization, random
copolymer, star polymer, styrene.
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DISCIPLINE:
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Chemistry
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HTTP:
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http://www.polymer.or.kr/mr/
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LANGUAGE:
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English
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PUB ID:
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103-438-981
(Last edited on
2007/12/02 14:18:12 US/Mountain)
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SPONSOR(S):
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ABSTRACT:
An octa-functional alkoxyamine initiator, with the 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) free
radical, was synthesized based on resorcinarene, with its efficiency to initiate the nitroxide-mediated free radical
copolymerization of styrene and methyl methacrylate (MMA) described. A difunctional analogue of this initiator
was also synthesized, using resorcinol as the core molecule. The structures of the resulting initiators were confirmed
by homolysis studies based on electron spin resonance spectroscopy and molecular modeling. The polymerization
behavior and characteristics of the polymers obtained using these two initiators were also compared. Well-defined
star-shaped and linear random copolymers, with low polydispersities and controlled molecular weights, were prepared.
The efficiencies of these initiators towards copolymerization, as well as the parameters permitting the formation
of well-defined polymers, were also investigated. The reactivity ratios were ra = 0.42 (a = styrene) and rb = 0.33
(b = MMA) for the octa-functional initiator system and ra = 0.45 and rb = 0.39 for the difunctional initiator system.
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