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Abstract
Diblock polymers are known to self-assemble into a variety of structures, and the effects of block molecular weights and volume fractions, along with the interactions between chemically different blocks, have been extensively studied. However, the consequences of molecular architectural differences between the blocks on phase behavior, particularly self-assembly into network morphologies, are less well explored. In this work, 223 linear-bottlebrush diblock polymers were synthesized using grafting-through living ring-opening metathesis polymerization. The linear block was poly(norbornene exo,exo-dimethyl ester), while five different bottlebrush blocks were used in order of increasing side-chain length: poly(norbornene exo,exo-di-isoamyl ester), poly(norbornene exo,exo-di-3,7-dimethyloctyl ester), poly(norbornene exo,exo-di-hexahydrofarnesyl ester), poly(norbornene exo,exo-di-dihydrophytyl ester), and poly(norbornene exo,exo-di-perhydrosolanesyl ester). Diblock polymer compositions ranged from approximately 30 to 70% by volume of the linear block, with total backbone degrees of polymerization ranging from 30 to 140, and side chains containing 5-45 carbon atoms. Phase behavior was studied in the vicinity of the double gyroid network window using a combination of small-, mid-, and wide-angle X-ray scattering.
Original language | English (US) |
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Pages (from-to) | 4947-4955 |
Number of pages | 9 |
Journal | Macromolecules |
Volume | 55 |
Issue number | 12 |
DOIs | |
State | Published - Jun 28 2022 |
Bibliographical note
Funding Information:This work was supported by the National Science Foundation through the University of Minnesota MRSEC under award number DMR-2011401. Synchrotron SAXS experiments were performed at the 12-ID-B and 5-ID-D beamlines of the Advanced Photon Source (APS). This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under contract no. DE-AC02-06CH11357. We thank Dr. Alice Chang for helpful advice and discussions, Dr. Aaron Lindsay for his help with collection of DSC data and fruitful discussions, and Camila Perales Rodriguez for help with sample preparation. M.L.C thanks the support of the National Science Foundation Graduate Research Fellowship Program under grant numbers 00039202 and 00074041.
Publisher Copyright:
© 2022 American Chemical Society.
MRSEC Support
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- 2 Active
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University of Minnesota Materials Research Science and Engineering Center (DMR-2011401)
Leighton, C. (PI) & Lodge, T. (CoI)
THE NATIONAL SCIENCE FOUNDATION
9/1/20 → 8/31/26
Project: Research project
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IRG-2: Mesoscale Network Materials
Mahanthappa, M. (Senior Investigator), Bates, F. S. (Senior Investigator), Calabrese, M. A. (Senior Investigator), Dorfman, K. (Senior Investigator), Ellison, C. J. (Senior Investigator), Ferry, V. E. (Senior Investigator), Lozano, K. (Senior Investigator), Reineke, T. M. (Senior Investigator) & Siepmann, I. (Senior Investigator)
9/1/20 → 8/31/26
Project: IRG