Silicate Dispersion and Mechanical Reinforcement in Polysiloxane/Layered Silicate Nanocomposites

Handle URI:
http://hdl.handle.net/10754/599372
Title:
Silicate Dispersion and Mechanical Reinforcement in Polysiloxane/Layered Silicate Nanocomposites
Authors:
Schmidt, Daniel F.; Giannelis, Emmanuel P.
Abstract:
We report the first in-depth comparison of the mechanical properties and equilibrium solvent uptake of a range of polysiloxane nanocomposites based on treated and untreated montmorillonite and fumed silica nanofillers. We demonstrate the ability of equilibrium solvent uptake data (and, thus, overall physical and chemical cross-link density) to serve as a proxy for modulus (combining rubber elasticity and Flory-Rehner theory), hardness (via the theory of Boussinesq), and elongation at break, despite the nonideal nature of these networks. In contrast, we find that tensile and tear strength are not well-correlated with solvent uptake. Interfacial strength seems to dominate equilibrium solvent uptake and the mechanical properties it predicts. In the montmorillonite systems in particular, this results in the surprising consequence that equilibrium solvent uptake and mechanical properties are independent of dispersion state. We conclude that edge interactions play a more significant role than degree of exfoliation, a result unique in the field of polymer nanocomposites. This demonstrates that even a combination of polymer/nanofiller compatibility and thermodynamically stable nanofiller dispersion levels may not give rise to reinforcement. These findings provide an important caveat when attempting to connect structure and properties in polymer nanocomposites, and useful guidance in the design of optimized polymer/layered silicate nanocomposites in particular. © 2009 American Chemical Society.
Citation:
Schmidt DF, Giannelis EP (2010) Silicate Dispersion and Mechanical Reinforcement in Polysiloxane/Layered Silicate Nanocomposites. Chem Mater 22: 167–174. Available: http://dx.doi.org/10.1021/cm9026978.
Publisher:
American Chemical Society (ACS)
Journal:
Chemistry of Materials
KAUST Grant Number:
KUS-C1-018-02
Issue Date:
12-Jan-2010
DOI:
10.1021/cm9026978
Type:
Article
ISSN:
0897-4756; 1520-5002
Sponsors:
This work was supported by the Dow-Corning Corporation and the United States Office of Naval Research (ONR). Specific thanks go to Dr. Deborah Bergstrom and Dr. Timothy Chao for arranging for mechanical properties testing at Dow-Corning's Midland, MI facility, and to Jason Fisk, Kermit Kwan, and Dr. Carl Fairbank for performing the testing. EPG acknowledges the support of Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST).
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorSchmidt, Daniel F.en
dc.contributor.authorGiannelis, Emmanuel P.en
dc.date.accessioned2016-02-28T06:05:48Zen
dc.date.available2016-02-28T06:05:48Zen
dc.date.issued2010-01-12en
dc.identifier.citationSchmidt DF, Giannelis EP (2010) Silicate Dispersion and Mechanical Reinforcement in Polysiloxane/Layered Silicate Nanocomposites. Chem Mater 22: 167–174. Available: http://dx.doi.org/10.1021/cm9026978.en
dc.identifier.issn0897-4756en
dc.identifier.issn1520-5002en
dc.identifier.doi10.1021/cm9026978en
dc.identifier.urihttp://hdl.handle.net/10754/599372en
dc.description.abstractWe report the first in-depth comparison of the mechanical properties and equilibrium solvent uptake of a range of polysiloxane nanocomposites based on treated and untreated montmorillonite and fumed silica nanofillers. We demonstrate the ability of equilibrium solvent uptake data (and, thus, overall physical and chemical cross-link density) to serve as a proxy for modulus (combining rubber elasticity and Flory-Rehner theory), hardness (via the theory of Boussinesq), and elongation at break, despite the nonideal nature of these networks. In contrast, we find that tensile and tear strength are not well-correlated with solvent uptake. Interfacial strength seems to dominate equilibrium solvent uptake and the mechanical properties it predicts. In the montmorillonite systems in particular, this results in the surprising consequence that equilibrium solvent uptake and mechanical properties are independent of dispersion state. We conclude that edge interactions play a more significant role than degree of exfoliation, a result unique in the field of polymer nanocomposites. This demonstrates that even a combination of polymer/nanofiller compatibility and thermodynamically stable nanofiller dispersion levels may not give rise to reinforcement. These findings provide an important caveat when attempting to connect structure and properties in polymer nanocomposites, and useful guidance in the design of optimized polymer/layered silicate nanocomposites in particular. © 2009 American Chemical Society.en
dc.description.sponsorshipThis work was supported by the Dow-Corning Corporation and the United States Office of Naval Research (ONR). Specific thanks go to Dr. Deborah Bergstrom and Dr. Timothy Chao for arranging for mechanical properties testing at Dow-Corning's Midland, MI facility, and to Jason Fisk, Kermit Kwan, and Dr. Carl Fairbank for performing the testing. EPG acknowledges the support of Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST).en
dc.publisherAmerican Chemical Society (ACS)en
dc.titleSilicate Dispersion and Mechanical Reinforcement in Polysiloxane/Layered Silicate Nanocompositesen
dc.typeArticleen
dc.identifier.journalChemistry of Materialsen
dc.contributor.institutionCornell University, Ithaca, United Statesen
dc.contributor.institutionUniversity of Massachusetts Lowell, Lowell, United Statesen
kaust.grant.numberKUS-C1-018-02en
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