Exchange Kinetics for a Single Block Copolymer in Micelles of Two Different Sizes

Zhao, Dan; Ma, Yuanchi; Lodge, Timothy P.

doi:10.1021/acs.macromol.7b02550

Title: Exchange Kinetics for a Single Block Copolymer in Micelles of Two Different Sizes

Journal Article · Tue Mar 13 00:00:00 EDT 2018 · Macromolecules

DOI:https://doi.org/10.1021/acs.macromol.7b02550· OSTI ID:1434721

Zhao, Dan ^[1]; Ma, Yuanchi ^[1];

^[1]

Univ. of Minnesota, Minneapolis, MN (United States)

The effect of micellar size on the chain exchange kinetics in spherical micelles consisting of poly(methyl methacrylate)-block-poly(n-butyl methacrylate) (PMMA-b- PnBMA) in a mixture of ionic liquids (1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [EMIM][TFSI], and 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)- imide, [BMIM][TFSI]) was investigated using time-resolved small-angle neutron scattering (TR-SANS). Two spherical micelles with different core sizes were prepared from a single block copolymer by using different protocols. In one case the micelles were formed in the presence of a cosolvent, while in the other a polymer thin film was directly dissolved in the ionic liquid. Interestingly, the micelle core size prepared from the latter method is ~30% larger than that obtained in the former case. TR-SANS experiments reveal that the rate of single chain exchange in the micelles with a larger core size is slowed down by ~3 times compared to the smaller core radius. We surmise this can be possibly attributed to the smaller interfacial area per chain, and larger corona density, for micelles with a larger core dimension. These geometrical factors can potentially lead to changes in both the attempt time and activation barrier for chain expulsion during the unimer exchange process. Our results clearly suggest that, in addition to the molecular characteristics of the block copolymer and solvent, the geometrical structure of the micelle plays an important role in the unimer dynamic exchange processes in block copolymer micelles.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: National Science Foundation (NSF); Northwestern University; E.I. DuPont de Nemours & Co.; The Dow Chemical Company; USDOE Office of Science (SC); National Institute of Standards and Technology (NIST)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1434721

Journal Information:: Macromolecules, Vol. 51, Issue 6; ISSN 0024-9297

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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Cited by: 27 works

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Title: Exchange Kinetics for a Single Block Copolymer in Micelles of Two Different Sizes

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