Coil-helix and sheet-helix block copolymers via macroinitiation from telechelic ROMP polymers

Elizabeth Elacqua, Anna Croom, Diane S. Lye, Marcus Weck

Research output: Contribution to journalArticle

Abstract

Coil-helix and sheet-helix block copolymers are synthesized by combining the ring-opening metathesis polymerization (ROMP) of norbornene or paracyclophanediene with the anionic polymerization of phenyl isocyanide. Key to the design is the use of an μ-ethynyl palladium (II) functionalized chain-transfer agent (CTA) that can be exploited in a stepwise manner for the termination of ROMP and the initiation of the anionic polymerization. Both the coil- and sheet-macroinitiators, and the ensuing covalent block copolymers, are analyzed using 1H NMR spectroscopy and gel-permeation chromatography. In all cases, the Pd-end group is maintained and all polymers demonstrate a monomodal distribution with dispersities (D) of 1.1-1.4. The resulting helix-coil and helix-sheet block copolymers formed by the macroinitiation route still demonstrate their intrinsic properties (fluorescence, preferential helix-sense).

Original languageEnglish (US)
JournalJournal of Polymer Science, Part A: Polymer Chemistry
DOIs
StateAccepted/In press - 2017

Fingerprint

Ring opening polymerization
Block copolymers
Polymers
Anionic polymerization
Palladium
Gel permeation chromatography
Cyanides
Nuclear magnetic resonance spectroscopy
Fluorescence

Keywords

  • Anionic polymerization
  • Block copolymers
  • Conjugated polymers
  • Helical polymer
  • Ring-opening metathesis polymerization

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

Cite this

Coil-helix and sheet-helix block copolymers via macroinitiation from telechelic ROMP polymers. / Elacqua, Elizabeth; Croom, Anna; Lye, Diane S.; Weck, Marcus.

In: Journal of Polymer Science, Part A: Polymer Chemistry, 2017.

Research output: Contribution to journalArticle

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N2 - Coil-helix and sheet-helix block copolymers are synthesized by combining the ring-opening metathesis polymerization (ROMP) of norbornene or paracyclophanediene with the anionic polymerization of phenyl isocyanide. Key to the design is the use of an μ-ethynyl palladium (II) functionalized chain-transfer agent (CTA) that can be exploited in a stepwise manner for the termination of ROMP and the initiation of the anionic polymerization. Both the coil- and sheet-macroinitiators, and the ensuing covalent block copolymers, are analyzed using 1H NMR spectroscopy and gel-permeation chromatography. In all cases, the Pd-end group is maintained and all polymers demonstrate a monomodal distribution with dispersities (D) of 1.1-1.4. The resulting helix-coil and helix-sheet block copolymers formed by the macroinitiation route still demonstrate their intrinsic properties (fluorescence, preferential helix-sense).

AB - Coil-helix and sheet-helix block copolymers are synthesized by combining the ring-opening metathesis polymerization (ROMP) of norbornene or paracyclophanediene with the anionic polymerization of phenyl isocyanide. Key to the design is the use of an μ-ethynyl palladium (II) functionalized chain-transfer agent (CTA) that can be exploited in a stepwise manner for the termination of ROMP and the initiation of the anionic polymerization. Both the coil- and sheet-macroinitiators, and the ensuing covalent block copolymers, are analyzed using 1H NMR spectroscopy and gel-permeation chromatography. In all cases, the Pd-end group is maintained and all polymers demonstrate a monomodal distribution with dispersities (D) of 1.1-1.4. The resulting helix-coil and helix-sheet block copolymers formed by the macroinitiation route still demonstrate their intrinsic properties (fluorescence, preferential helix-sense).

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