Cationic Bottlebrush Copolymers from Partially Hydrolyzed Poly(oxazoline)s. Floyd, T. G., Hakkinen, S., Hall, S. C. L., Dalgliesh, R. M., Lehnen, A., Hartlieb, M., & Perrier, S. MACROMOLECULES, 54(20):9461–9473, October, 2021. doi abstract bibtex Cationically charged bottlebrush copolymers were produced by hydrolysis of poly(2-ethyl-2-oxazoline) (PEtOx). The cationic ring-opening polymerization of EtOx was initiated using a styrene derivative to produce PEtOx macromonomers with two different lengths. After detailed characterization, these macromonomers were polymerized via reversible addition-fragmentation chain transfer (RAFT) polymerization in a grafting-through process. The length of the bottlebrush backbone was varied, and it was found that a good control over the polymerization could be retained up to backbone DP 50. Hydrolysis of PEtOx repeating units under acidic conditions afforded cationic bottlebrushes, with a defined charge content that could be adjusted by changing the hydrolysis reaction time. Bottlebrush copolymers were analyzed in detail using size-exclusion chromatography, small-angle neutron scattering, and atomic force microscopy indicating a cylindrical topology and an increasing flexibility with increasing chain length.
@article{floyd_cationic_2021,
title = {Cationic {Bottlebrush} {Copolymers} from {Partially} {Hydrolyzed} {Poly}(oxazoline)s},
volume = {54},
issn = {0024-9297},
doi = {10.1021/acs.macromol.1c01458},
abstract = {Cationically charged bottlebrush copolymers were produced by hydrolysis of poly(2-ethyl-2-oxazoline) (PEtOx). The cationic ring-opening polymerization of EtOx was initiated using a styrene derivative to produce PEtOx macromonomers with two different lengths. After detailed characterization, these macromonomers were polymerized via reversible addition-fragmentation chain transfer (RAFT) polymerization in a grafting-through process. The length of the bottlebrush backbone was varied, and it was found that a good control over the polymerization could be retained up to backbone DP 50. Hydrolysis of PEtOx repeating units under acidic conditions afforded cationic bottlebrushes, with a defined charge content that could be adjusted by changing the hydrolysis reaction time. Bottlebrush copolymers were analyzed in detail using size-exclusion chromatography, small-angle neutron scattering, and atomic force microscopy indicating a cylindrical topology and an increasing flexibility with increasing chain length.},
number = {20},
urldate = {2021-11-11},
journal = {MACROMOLECULES},
author = {Floyd, Thomas G. and Hakkinen, Satu and Hall, Stephen C. L. and Dalgliesh, Robert M. and Lehnen, Anne-Catherine and Hartlieb, Matthias and Perrier, Sebastien},
month = oct,
year = {2021},
pages = {9461--9473},
}
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