Nitroxide-mediated polymerization to form symmetrical ABA triblock copolymers from a bidirectional alkoxyamine initiator

Jean Ruehl, Aaron Nilsen, Stephen Born, Praveen Thoniyot, Li ping Xu, Shaowei Chen, Rebecca Braslau

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

Bidirectional alkoxyamine 2 was synthesized and used as the initiator in the polymerization of styrene (S), n-butyl acrylate (nBA), t-butyl acrylate (tBA), isoprene (I), and dimethylacrylamide (DMA). A variety of symmetrical ABA triblock copolymers were prepared, ranging in size from 5 to 59 kDa. Kinetics studies and gel permeation chromatography (GPC) confirmed the "living" nature of these polymerizations. Trifluoroacetic acid was used to convert the PtBA blocks of these polymers into poly(acrylic acid) (PAA) blocks, forming ABA amphiphilic triblock copolymers. AFM images of PAA-b-PnBA-b-PAA and PAA-b-PS-b-PAA triblock copolymers ionized by the addition of 2,2′-(ethylenedioxy)bis(ethylamine) show evidence of self-assembly.

Original languageEnglish (US)
Pages (from-to)2564-2571
Number of pages8
JournalPolymer
Volume48
Issue number9
DOIs
StatePublished - Apr 24 2007

Keywords

  • Alkoxyamine
  • Bidirectional
  • Nitroxide-mediated polymerization

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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