Stress-Strain Relations for Nematic Polymer Networks with Various Concentrations of Flexible and Stiff Parts

2014 ◽  
Vol 23 (5) ◽  
pp. 353-360 ◽  
Author(s):  
Janusz Walasek ◽  
Radosław Jedynak
Keyword(s):  
Polymer Networks ◽  
Stress Strain ◽  
Nematic Polymer

Crosslinking, Filler, or Transition Constraint of Polymer Networks. II

1971 ◽  
Vol 44 (5) ◽  
pp. 1227-1248
Author(s):  
A. F. Blanchard
Keyword(s):  
Strain Hardening ◽  
Polymer Networks ◽  
Stress Strain ◽  
New Concepts ◽  
Filler Reinforcement ◽  
Hard Fraction ◽  
Rubber Filler

Abstract The theory of Part I is developed by application to filler reinforcement of NR and SBR. For unswollen but prestretched networks it quantifies entire stress-strain curves and applies new concepts of extensibility and strain hardening. Constraint of swelling is expressed by a constant Ø, termed linkage reinforcement, and by an effective hard fraction Cm per cm2 of compound. For rubber-filler swelling vc the modified Flory functions F(νc) in Part I need 3% correction.

scholarly journals Modeling out-of-plane actuation in thin-film nematic polymer networks: From chiral ribbons to auto-origami boxes via twist and topology

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Vianney Gimenez-Pinto ◽  
Fangfu Ye ◽  
Badel Mbanga ◽  
Jonathan V. Selinger ◽  
Robin L. B. Selinger
Keyword(s):  
Thin Film ◽  
Polymer Networks ◽  
And Topology ◽  
Out Of Plane ◽  
Nematic Polymer

Specific Solvent Effects in Swollen Polymer Networks

1974 ◽  
Vol 47 (5) ◽  
pp. 1151-1159 ◽  
Author(s):  
C. U. Yu ◽  
J. E. Mark
Keyword(s):  
Solvent Effects ◽  
Volume Fraction ◽  
Polymer Networks ◽  
Low Molecular Weight ◽  
Constant Composition ◽  
Stress Strain ◽  
Unperturbed Dimensions ◽  
Cohesive Energy Density ◽  
Octyl Acetate ◽  
Good Agreement

Abstract Stress—strain isotherms at 25° have been determined for uniaxially elongated poly(dimethylsiloxane) networks in the unswollen state and swollen consecutively with each of the following very dissimilar diluents : low molecular weight dimethylsiloxane fluid, n-hexadecane, 2,4-dichlorotoluene, and n-octyl acetate Five constant composition experiments were carried out, at values of the volume fraction ν2 of polymer of 1.00, 0.80, 0.60, 0.50, and 0.35. At ν2=0.80, the stress—strain isotherms were found to be independent of the nature of the diluent; at lower values of ν2, however, these isotherms were significantly different, thus demonstrating the existence of a “specific solvent effect” in swollen polymer networks. Interpretation of these data in terms of the statistical theory of rubberlike elasticity gave results in good agreement with previously reported specific solvent effects on the unperturbed dimensions of uncrosslinked poly (dimethylsiloxane) chains in solution. In neither case, however, do these effects correlate well with the cohesive energy density or dielectric of the diluent or solvent medium.

Electroluminescent Nematic Polymer Networks with Polarised Emission

2001 ◽  
Vol 364 (1) ◽  
pp. 511-518 ◽  
Author(s):  
Adam Contoret ◽  
Simon Farrar ◽  
Perregrin Jackson ◽  
Stephen M. Kelly ◽  
Sultan Khan ◽  
...  
Keyword(s):  
Polymer Networks ◽  
Nematic Polymer

Stress-Strain Isotherms and Stress-Temperature Coefficients of Poly(Dimethylsiloxane) Networks in Compression

1975 ◽  
Vol 48 (2) ◽  
pp. 176-185 ◽  
Author(s):  
R. Y. S. Chen ◽  
C. U. Yu ◽  
J. E. Mark
Keyword(s):  
Statistical Theory ◽  
Temperature Coefficient ◽  
Polymer Networks ◽  
Temperature Measurements ◽  
Stress Strain ◽  
Unperturbed Dimensions ◽  
Temperature Coefficients ◽  
A Value ◽  
Good Agreement

Abstract Stress-strain isotherms at 30, 45, 60, 75, and 90°C have been determined for compressed, unswollen poly(dimethylsiloxane) networks which had been prepared either in the undiluted state or in solution. For these networks in compression, deviations of the dependence of stress on strain from that predicted by the statistical theory of rubberlike elasticity are much less than is the case for polymer networks in elongation. The present data nonetheless give a value for the temperature coefficient of the unperturbed dimensions of the network chains which is in good agreement with published results on networks of poly(dimethylsiloxane) in elongation. This agreement thus seems to validate the intentional disregard of such deviations in analyses of stress-temperature measurements.

Light-Induced Formation of Dynamic and Permanent Surface Topologies in Chiral–Nematic Polymer Networks

2012 ◽  
Vol 45 (19) ◽  
pp. 8005-8012 ◽  
Author(s):  
Danqing Liu ◽  
Cees W. M. Bastiaansen ◽  
Jaap M. J. den Toonder ◽  
Dirk J. Broer
Keyword(s):  
Polymer Networks ◽  
Chiral Nematic ◽  
Nematic Polymer
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