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

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

doi:10.1002/pola.28542

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

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

Chemistry

Research output: Contribution to journal › Article › peer-review

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 (Đ) 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 language	English (US)
Pages (from-to)	2991-2998
Number of pages	8
Journal	Journal of Polymer Science, Part A: Polymer Chemistry
Volume	55
Issue number	18
DOIs	https://doi.org/10.1002/pola.28542
State	Published - Sep 15 2017

Keywords

anionic polymerization
block copolymers
conjugated polymers
helical polymer
ring-opening metathesis polymerization

ASJC Scopus subject areas

Polymers and Plastics
Organic Chemistry
Materials Chemistry

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10.1002/pola.28542

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title = "Coil-helix and sheet-helix block copolymers via macroinitiation from telechelic ROMP polymers",

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).",

keywords = "anionic polymerization, block copolymers, conjugated polymers, helical polymer, ring-opening metathesis polymerization",

author = "Elizabeth Elacqua and Anna Croom and Lye, {Diane S.} and Marcus Weck",

note = "Publisher Copyright: {\textcopyright} 2017 Wiley Periodicals, Inc.",

year = "2017",

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doi = "10.1002/pola.28542",

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T1 - Coil-helix and sheet-helix block copolymers via macroinitiation from telechelic ROMP polymers

AU - Elacqua, Elizabeth

AU - Croom, Anna

AU - Lye, Diane S.

AU - Weck, Marcus

PY - 2017/9/15

Y1 - 2017/9/15

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 (Đ) 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 (Đ) 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).

KW - anionic polymerization

KW - block copolymers

KW - conjugated polymers

KW - helical polymer

KW - ring-opening metathesis polymerization

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JO - Journal of Polymer Science, Part A: Polymer Chemistry

JF - Journal of Polymer Science, Part A: Polymer Chemistry

IS - 18

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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