Abstract
The present state of development of the statistical mechanics of rubber elasticity is reviewed and analysed, starting from some problems and controversial results drawn from recent experimental progress in this area. Attention is focused on the tube model as a mean field approach to the statistical mechanics of polymer systems with topology conservation. In particular, a new model for simulating the topological constraints in polymer networks and melts is presented which allows the order and the deformation dependence of the tube dimensions to be calculated. Conclusions resulting from the description of large-strain and small-strain behaviour of dry, completely crosslinked networks are discussed and compared with experimental data where all modes of deformation usually employed can be described with similar accuracy. Further, the concept of relaxed microscopic deformation much smaller than the macroscopic deformation of the sample is introduced, which allows explanation of mechanical and thermodynamic properties as well as the scattering results for networks at higher swelling degrees. Similarly, constraint release effects are expected to be responsible for the different experimental results collected for end-linked networks and for networks prepared by cross-linking of long primary chains. The different degrees of completeness of crosslinking have to be considered as the main reason for these differences.
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Abbreviations
- A:
-
microstructure factor
- a1, c :
-
activity of the solvent over a swollen cross-linked polymer
- a1, u :
-
activity of the solvent over an uncrosslinked polymer system
- C1, C2 :
-
Mooney-Rivlin parameters
- c1, c2 :
-
reduced Mooney-Rivlin parameters
- d0 :
-
undeformed tube radius
- dμ :
-
deformed tube radius (μ=x, y, z)
- F:
-
elastic free energy
- FT :
-
elastic free energy of a network with a special topology
- f:
-
functionality of the crosslinks
- G:
-
shear modulus
- GC :
-
shear modulus contribution arising from chemical crosslinks
- Ge :
-
maximum possible contribution of entangled chains to the modulus
- GN :
-
shear modulus contribution arising from topological constraints
- G 0N :
-
plateau modulus of an uncrosslinked polymer system
- g:
-
front factor
- gr :
-
reduced shear modulus
- H:
-
Hamiltonian
- Iαβ :
-
topological invariant
- I1, I2, I3 :
-
invariants of the deformation tensor
- Ĩ1, Ĩ2 :
-
generalized invariants of a generalized deformation tensor
- k:
-
scattering vector
- k:
-
Boltzmann constant
- L:
-
contour length of a macromolecule
- Lc :
-
contour length of a network strand
- l:
-
statistical segment length
- M:
-
number of chemical crosslinks
- Mc :
-
number-average molecular weight of a network chain
- Mn :
-
number-average molecular weight of a primary chain
- Mw :
-
weight-average molecular weight of a primary chain
- Ms :
-
molecular weight of a statistical segment
- m:
-
Gauss linking number
- N:
-
Number of primary chains
- NA :
-
Avogadro number
- Nk :
-
number of network chains
- Ns :
-
number of statistical segments per macromolecule
- Nc :
-
number of statistical segments per network chain
- NF :
-
Flory number [= number of network chains in the volume (lLc)3/2]
- Nsl :
-
number of slip-links
- n:
-
number of spatial neighbours of a network junction
- np :
-
number density of polymer chains
- ns :
-
number density of statistical segments
- n1 :
-
number of moles of solvent in the swollen network
- R(s), r(s):
-
configurations of a macromolecule
- \(\hat R(s),\hat r(s)\) :
-
mean configurations of a macromolecule
- Rc :
-
end-to-end distance of a network chain
- Rgi :
-
radius of gyration of a chain in the reference (undeformed) state
- Rg∥ :
-
radius of gyration of a network chain parallel to the stretching
- Rg⊥ :
-
radius of gyration of a network chain perpendicular to the stretching
- S(k):
-
scattering function
- s:
-
chain arc length
- T:
-
temperature, topology
- Te :
-
trapping factor
- V, V0 :
-
volume
- \(\bar v\) 1 :
-
molar volume of the diluent
- v2 :
-
polymer volume fraction in a swollen gel
- v *2 :
-
polymer volume fraction corresponding to the equilibrium swelling degree
- v **2 :
-
cross-over volume fraction from Gaussian to excluded-volume behaviour of the network chains
- v 02 :
-
volume fraction of polymer in the solution prior to crosslinking
- wel :
-
elastic potential
- ws :
-
sol fraction
- wT :
-
probability of a special topology
- Z:
-
canonical partition integral
- α (or β):
-
parameter of the constraint release effect in polymer networks
- Λ:
-
dimensionless parameter of the strength of topological constraints
- ζ:
-
parameter of the Flory-Kästner theory characterizing the departures from affine transformation of the shapes of domains
- η:
-
“memory” factor
- κ:
-
parameter of the Flory-Kästner theory characterising the strength of restrictions on junction fluctuations
- λ:
-
deformation ratio of the sample, deformation tensor
- λi :
-
linear isotropic extension ratio of swollen networks
- λmic :
-
microscopic deformation ratio
- μc :
-
chemical crosslink density
- μ1, el :
-
elastic contribution of the chemical potential of the diluent in swollen gels
- vc :
-
network chain density
- ξ:
-
cycle rank (= number of independent circuits in the network)
- ϱp :
-
polymer density (g/mol)
- σ:
-
nominal stress (equilibrium value of the elastic force measured in uniaxial deformation divided by the undeformed cross-sectional area of the sample)
- σM :
-
Mooney stress [=σ/(λ − λ−2)]
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Heinrich, G., Straube, E., Helmis, G. (1988). Rubber elasticity of polymer networks: Theories. In: Polymer Physics. Advances in Polymer Science, vol 85. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0024050
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