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Mechanical properties and local mobility of atactic-polystyrene films under constant-shear deformation
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10.1063/1.4754736
/content/aip/journal/jcp/137/12/10.1063/1.4754736
http://aip.metastore.ingenta.com/content/aip/journal/jcp/137/12/10.1063/1.4754736
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic illustration of a typical stress-strain response of a glassy polymer upon shear deformation. Here the shear modulus G is defined as a slope in a linear elastic regime.

Image of FIG. 2.
FIG. 2.

The stress-strain curves for the 16-chains aPS capped film at normal pressure 32 MPa (circles) and 52 MPa (squares) at temperature 300 K (a) and at pressure 52 MPa and at two temperatures 300 K (filled squares) and 370 K (open squares) (b). In both figures the measured shear stress is taken at the highest simulated shear rate  s−1.

Image of FIG. 3.
FIG. 3.

The stress-strain curves for the 16 aPS capped film at normal pressure 32 MPa (circles) and 52 MPa (squares) at temperature 300 K (a) and pressure 52 MPa at two temperatures 300 K (filled squares) and 370 K (open squares) (b). In both figures the shear stress is taken at the lowest simulated shear rate  s−1.

Image of FIG. 4.
FIG. 4.

Shear modulus as a function of the shear rate at two normal pressures and fixed temperature 300 K (a) and two temperatures at fixed normal pressure 52 MPa (b). The dashed lines in both figures denote roughly the transition from the sliding regime to the stick-slip regime.

Image of FIG. 5.
FIG. 5.

Yield stress as a function of the shear rate at two temperatures (a) and two normal pressures (b). Insets: the yield stress as a function of temperature (a) and normal pressure (b). The vertical arrows in the insets denote the increase of the shear rate from  s−1 to  s−1. The dashed lines in both figures denote roughly the transition from the sliding regime to the stick-slip regime.

Image of FIG. 6.
FIG. 6.

Applied work W and internal energy U at high  s−1 (a) and low  s−1 (b) shear rates, temperature 300 K, and pressure 52 MPa.

Image of FIG. 7.
FIG. 7.

Various contributions to the energy (a) and to the shear stress (b) during the constant shear deformation at low shear rate,  s−1, temperature 300 K, and pressure 32 MPa.

Image of FIG. 8.
FIG. 8.

(a) Change of the average X coordinate for the top layer upon shear deformation with different shear rates. (b) Change of the average X coordinate for different layers in a capped film upon shear deformation at low,  s−1, shear rate. In both figures the calculations were made at 300 K and 52 MPa.

Image of FIG. 9.
FIG. 9.

(a) Ratio of the averaged velocity of the polymer segments in different layers of simulated film to the actual velocity of the top substrate at normal pressure 52 MPa, temperature 300 K, and for high and low shear rates. The dashed line denotes the velocity profile in the case of the ideal affine shear deformation. (b) X-component of the mean squared displacements of all particles in the top layer during shear deformation at high and low shear rates and also for non-sheared film (diamonds). The slopes 2 and 0.5 denote the ballistic and sub-diffusive motion of polymer segments.

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/content/aip/journal/jcp/137/12/10.1063/1.4754736
2012-09-27
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Mechanical properties and local mobility of atactic-polystyrene films under constant-shear deformation
http://aip.metastore.ingenta.com/content/aip/journal/jcp/137/12/10.1063/1.4754736
10.1063/1.4754736
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