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Synthesis of Discotic Columnar Side-Chain Liquid Crystalline Polymers by Ring-Opening Metathesis Polymerization (ROMP)

Weck, Marcus and Mohr, Bernhard and Maughon, Bob R. and Grubbs, Robert H. (1997) Synthesis of Discotic Columnar Side-Chain Liquid Crystalline Polymers by Ring-Opening Metathesis Polymerization (ROMP). Macromolecules, 30 (21). pp. 6430-6437. ISSN 0024-9297. https://resolver.caltech.edu/CaltechAUTHORS:20180719-152138255

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Abstract

Discotic liquid crystalline polymers bearing alkoxy-substituted triphenylene moieties in the side-chain were synthesized by ring-opening metathesis polymerization using a well-defined ruthenium initiator. To elucidate the effect of backbone flexibility on the mesomorphism, norbornene and cyclobutene monomers containing triphenylene moieties were synthesized, which yielded the relatively rigid poly(norbornene)s and the more flexible poly(butadiene)s, respectively, after polymerization. To further increase the backbone flexibility, the poly(butadiene)s were hydrogenated using Crabtree's catalyst to yield triphenylene-substituted poly(butane)s. The mesomorphic behavior of the polymers has been investigated by differential scanning calorimetry (DSC) and powder diffraction X-ray scattering (wide angle X-ray scattering, WAXS). All polymers bearing a 2,3,6,7,19-pentakis(decyloxy)triphenylene-based mesogenic unit exhibit enantiotropic discotic hexagonal mesophases, while the pentoxy analogues do not display liquid crystalline behavior. No effect of backbone rigidity on the mesomorphism could be detected.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://dx.doi.org/10.1021/ma970292xDOIArticle
https://pubs.acs.org/doi/suppl/10.1021/ma970292xPublisherSupporting Information
ORCID:
AuthorORCID
Grubbs, Robert H.0000-0002-0057-7817
Additional Information:© 1997 American Chemical Society. Received March 4, 1997; Revised Manuscript Received June 12, 1997. This research has been funded by the National Science Foundation and Akzo American Inc. B.M. gratefully acknowledges a Feodor Lynen-Fellowship from the Alexander von Humboldt-Foundation.
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Funding AgencyGrant Number
NSFUNSPECIFIED
Akzo AmericaUNSPECIFIED
Alexander von Humboldt FoundationUNSPECIFIED
Issue or Number:21
Record Number:CaltechAUTHORS:20180719-152138255
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180719-152138255
Official Citation:Synthesis of Discotic Columnar Side-Chain Liquid Crystalline Polymers by Ring-Opening Metathesis Polymerization (ROMP) Marcus Weck, Bernhard Mohr, Bob R. Maughon, and Robert H. Grubbs Macromolecules 1997 30 (21), 6430-6437 DOI: 10.1021/ma970292x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88028
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:19 Jul 2018 22:41
Last Modified:03 Oct 2019 20:02

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