Fragility of an isochorically confined polymer glass

Chuan Zhang; Yunlong Guo; Kimberly B. Shepard; Rodney D. Priestley

doi:10.1021/jz302002v

Fragility of an isochorically confined polymer glass

Chuan Zhang, Yunlong Guo, Kimberly B. Shepard, Rodney D. Priestley

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41 Scopus citations

Abstract

We report the effect of isochoric confinement on the dynamic fragility of a polymeric glass-former, that is, polystyrene (PS). Utilizing silica-capped PS nanospheres as a model system, the fictive temperature (T_f) and the isochoric heat capacity (C_v) are measured as a function of diameter via differential scanning calorimetry. By examining T_f as a function of cooling rate for each sample, the isochoric fragility (m_v) is obtained, which decreases significantly as the diameter of the nanospheres is reduced from 260 to 129 nm. Hence, the temperature dependence of structural relaxation near the glass transition is weakened with isochoric confinement.

Original language	English (US)
Pages (from-to)	431-436
Number of pages	6
Journal	Journal of Physical Chemistry Letters
Volume	4
Issue number	3
DOIs	https://doi.org/10.1021/jz302002v
State	Published - Feb 7 2013

All Science Journal Classification (ASJC) codes

General Materials Science
Physical and Theoretical Chemistry

Keywords

confinement
fragility
glass transition
nanoparticles
polystyrene

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10.1021/jz302002v

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abstract = "We report the effect of isochoric confinement on the dynamic fragility of a polymeric glass-former, that is, polystyrene (PS). Utilizing silica-capped PS nanospheres as a model system, the fictive temperature (Tf) and the isochoric heat capacity (Cv) are measured as a function of diameter via differential scanning calorimetry. By examining Tf as a function of cooling rate for each sample, the isochoric fragility (mv) is obtained, which decreases significantly as the diameter of the nanospheres is reduced from 260 to 129 nm. Hence, the temperature dependence of structural relaxation near the glass transition is weakened with isochoric confinement.",

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AU - Zhang, Chuan

AU - Guo, Yunlong

AU - Shepard, Kimberly B.

AU - Priestley, Rodney D.

PY - 2013/2/7

Y1 - 2013/2/7

N2 - We report the effect of isochoric confinement on the dynamic fragility of a polymeric glass-former, that is, polystyrene (PS). Utilizing silica-capped PS nanospheres as a model system, the fictive temperature (Tf) and the isochoric heat capacity (Cv) are measured as a function of diameter via differential scanning calorimetry. By examining Tf as a function of cooling rate for each sample, the isochoric fragility (mv) is obtained, which decreases significantly as the diameter of the nanospheres is reduced from 260 to 129 nm. Hence, the temperature dependence of structural relaxation near the glass transition is weakened with isochoric confinement.

AB - We report the effect of isochoric confinement on the dynamic fragility of a polymeric glass-former, that is, polystyrene (PS). Utilizing silica-capped PS nanospheres as a model system, the fictive temperature (Tf) and the isochoric heat capacity (Cv) are measured as a function of diameter via differential scanning calorimetry. By examining Tf as a function of cooling rate for each sample, the isochoric fragility (mv) is obtained, which decreases significantly as the diameter of the nanospheres is reduced from 260 to 129 nm. Hence, the temperature dependence of structural relaxation near the glass transition is weakened with isochoric confinement.

KW - confinement

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KW - glass transition

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Fragility of an isochorically confined polymer glass

Abstract

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