Water-Responsive Mechanically Adaptive Nanocomposites Based on Styrene–Butadiene Rubber and Cellulose Nanocrystals—Processing Matters
Article
Annamalai, Pratheep K., Dagnon, Koffi L., Monemian, Seyedali, Foster, E. Johan, Rowan, Stuart J. and Weder, Christoph. 2014. "Water-Responsive Mechanically Adaptive Nanocomposites Based on Styrene–Butadiene Rubber and Cellulose Nanocrystals—Processing Matters
." ACS Applied Materials and Interfaces. 6 (2), pp. 967-76. https://doi.org/10.1021/am404382x
| Article Title | Water-Responsive Mechanically Adaptive Nanocomposites Based on Styrene–Butadiene Rubber and Cellulose Nanocrystals—Processing Matters |
|---|---|
| ERA Journal ID | 40638 |
| Article Category | Article |
| Authors | Annamalai, Pratheep K., Dagnon, Koffi L., Monemian, Seyedali, Foster, E. Johan, Rowan, Stuart J. and Weder, Christoph |
| Journal Title | ACS Applied Materials and Interfaces |
| Journal Citation | 6 (2), pp. 967-76 |
| Number of Pages | 10 |
| Year | 2014 |
| Publisher | American Chemical Society |
| Place of Publication | United States |
| ISSN | 1944-8244 |
| 1944-8252 | |
| Digital Object Identifier (DOI) | https://doi.org/10.1021/am404382x |
| Web Address (URL) | https://pubs.acs.org/doi/10.1021/am404382x |
| Abstract | Biomimetic, stimuli-responsive polymer nanocomposites based on a hydrophobic styrene–butadiene rubber (SBR) matrix and rigid, rod-like cellulose nanocrystals (CNCs) isolated from cotton were prepared by three different approaches, and their properties were studied and related to the composition, processing history, and exposure to water as a stimulus. The first processing approach involved mixing an aqueous SBR latex with aqueous CNC dispersions, and films were subsequently formed by solution-casting. The second method utilized the first protocol, but films were additionally compression-molded. The third method involved the formation of a CNC organogel via a solvent exchange with acetone, followed by infusing this gel, in which the CNCs form a percolating network with solutions of SBR in tetrahydrofuran. The thermomechanical properties of the materials were established by dynamic mechanical thermal analysis (DMTA). In the dry state, all nanocomposites show much higher tensile storage moduli, E′, than the neat SBR or the SBR latex. E′ increases with the CNC content and depends strongly on the processing method, which appears to influence the morphology of the SBR nanocomposites produced. The highest E′ values were observed for the solution cast samples involving an SBR latex, where E′ increased from 3 MPa for the neat SBR to ca. 740 MPa for the nanocomposite containing 20% v/v CNCs. Upon submersion in deionized water, a dramatic reduction of E′ was observed, for example from 740 to 5 MPa for the solution-cast nanocomposite containing 20% v/v CNCs. This change is interpreted as a disengagement of the percolating CNC network, on account of modest aqueous swelling and competitive hydrogen bonding of water molecules with the CNCs. It is shown that the method of preparation also influenced the swelling behavior and kinetics of modulus switching, consistent with different arrangements of the CNCs, which serve as channels for water absorption and transport within the hydrophobic SBR matrix. |
| Keywords | nanocomposites; styrene−butadiene rubber; cellulose nanocrystals; water-responsive behavior; processing; stimuli-responsive; mechanically adaptive |
| Contains Sensitive Content | Does not contain sensitive content |
| ANZSRC Field of Research 2020 | 340302. Macromolecular materials |
| Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
| Byline Affiliations | University of Fribourg, Switzerland |
| Case Western Reserve University, United States |
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