Zhang, X, Ries, ME orcid.org/0000-0002-8050-3200 and Hine, PJ (2021) Time–Temperature Superposition of the Dissolution of Silk Fibers in the Ionic Liquid 1-Ethyl-3-methylimidazolium Acetate. Biomacromolecules, 22 (3). pp. 1027-1324. ISSN 1525-7797
Abstract
This study investigated the dissolution of silk multifilament fibers in the ionic liquid 1-ethyl-3-methylimidazolium acetate. The dissolution process was found to create a silk composite fiber, comprising undissolved silk multifilaments surrounded by a coagulated silk matrix. The dissolution procedure was carried out for a range of temperatures and times. The resulting composite fibers were studied using a combination of optical microscopy, wide-angle X-ray diffraction (XRD), and tensile testing. An azimuthal (α) XRD scan enabled the orientation of the composite silk filaments to be quantified through a second Legendre polynomial function (P2). The P2 results could be shifted to construct a single master curve using time–temperature superposition (TTS). The shifting factors were found to have an Arrhenius behavior with an activation energy of 138 ± 13 kJ/mol. Using a simple rule of mixtures, the P2 measurements were used to calculate the dissolved silk matrix volume fraction (Vm), which also displayed TTS forming a single master curve with an activation energy of 139 ± 15 kJ/mol. The tensile Young’s modulus of each silk composite filament was measured, and these results similarly formed a master curve with an activation energy of 116 ± 12 kJ/mol.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2021 American Chemical Society. This is an author produced version of an article published in Biomacromolecules. Uploaded in accordance with the publisher's self-archiving policy. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Soft Matter Physics (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 12 Feb 2021 11:48 |
Last Modified: | 09 Feb 2022 01:38 |
Status: | Published |
Publisher: | American Chemical Society |
Identification Number: | 10.1021/acs.biomac.0c01467 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:170988 |