Journal
MACROMOLECULES
Volume 49, Issue 19, Pages 7597-7604Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.6b01461
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Funding
- National Science Foundation [DMR1310433]
- National Science Grant [OCI-1053575, DMR130011]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1310433] Funding Source: National Science Foundation
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We employ molecular simulations to show that a generic isolated macromolecule behaves as a glass-forming liquid in an extreme state of nano confinement. Specifically, its glass transition temperature T-g is strongly suppressed with respect to a corresponding bulk-state polymer, but adsorption onto an attractive substrate can reverse this effect. Results indicate that observations of bulklike T-g in individual nanoconfined systems can result from a compensation point between T-g enhancement and T-g suppression. In addition to their implications for the understanding of nanostructured synthetic materials, these results are also likely relevant to the dynamics of globular and adsorbed biological macromolecules.
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