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Ordering Transitions of Fluoroalkyl-Ended Poly(ethylene glycol): Rheology and SANS

Tae, Giyoong and Kornfield, Julia A. and Hubbell, Jeffrey A. and Lal, Jyotsana (2002) Ordering Transitions of Fluoroalkyl-Ended Poly(ethylene glycol): Rheology and SANS. Macromolecules, 35 (11). pp. 4448-4457. ISSN 0024-9297. doi:10.1021/ma011809e.

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Aqueous solutions of associative polymers consisting of poly(ethylene glycol) (PEG) (6K or 10K g/mol) terminated at both ends with hydrophobic fluoroalkyl segments, −(CH_2)_2CnF_(2n+1) (n = 6, 8, or 10), exhibit ordering transitions with increasing concentration. The hydrophobic cores of the micelle-like aggregates order into a body-centered-cubic (bcc) structure, as observed by small-angle neutron scattering. The aggregation number of the hydrophobic core N_(ag) is determined by the length of the hydrophobic end group and is insensitive to polymer concentration or temperature. Ordering is enhanced by reducing PEG length for a given end group (hence, similar N_(ag)) or by increasing end group length (larger N_(ag)) for a given PEG length. This micelle packing effect is manifested in changes in the viscoelastic properties. Specifically, the single-relaxation behavior in the dynamic moduli changes upon ordering as a new low-frequency elastic plateau appears, and in creep a linear response changes to yielding behavior.

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Kornfield, Julia A.0000-0001-6746-8634
Additional Information:© 2002 American Chemical Society. Received 18 October 2001. Published online 27 April 2002. Published in print 21 May 2002. This research was supported in part by a grant from NSF (CTS-9729443), a graduate fellowship from the Korean Ministry of Education (Giyoong Tae), and the MRSEC Program of NSF (DMR-0080065). This work benefitted from the use of the IPNS at Argonne National Laboratory (US DoE-BES contract W-31-109-ENG-38).
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Ministry of Education (Korea)UNSPECIFIED
Department of Energy (DOE)W-31-109-ENG-38
Issue or Number:11
Record Number:CaltechAUTHORS:20170720-084036432
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Official Citation:Ordering Transitions of Fluoroalkyl-Ended Poly(ethylene glycol):  Rheology and SANS Giyoong Tae, Julia A. Kornfield, Jeffrey A. Hubbell, and Jyotsana Lal Macromolecules 2002 35 (11), 4448-4457 DOI: 10.1021/ma011809e
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:79239
Deposited By: Ruth Sustaita
Deposited On:20 Jul 2017 18:23
Last Modified:15 Nov 2021 17:46

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