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Details van artikel 13 van 14 gevonden artikelen
| Titel: |
The Theory of High Elasticity and Birefringence of Rubbers |
| Auteur: |
Priss, L. S. |
| Verschenen in: |
International journal of polymeric materials |
| Paginering: | Jaargang 8 (1980) nr. 2-3 pagina's 99-116 |
| Jaar: |
1980-09-01 |
| Inhoud: |
On the basis of a “channel” model an attempt has been made to account for the limitation of the number of possible chain conformations in bulk elastomer. Each chain is supposed to fluctuate near its average position—the “channel”, determined by the conditions of bulk polymer formation. Then the probability of a certain chain conformation existence is reduced with the increase of its deviations from the channel axis. Chain fluctuations along the channel axis are free from any constraints because such a change of the chain conformations is not connected with the variation of its neighbours locations. In the first approximation (when the chain and the channel are divided into two parts) the calculations based on the model pointed out lead to the free energy formula deduced earlier by the author while starting from partly different assumptions. The formula fits well the experimental data for various types of deformations. Particularly, the theoretical dependence of true stress, s`, on deformation has a linear form when plotted in coordinates σ/2(λ2 - 1/λ) versus 1/λ(λ is the extension ratio). It permits consideration of the present study as being a theoretical basis for the Monney Rivlin formula from the molecular point of view. Calculated on the same grounds, the theoretical dependence of birefringence. Δn, on λ at uniaxial tension also has a linear form in coordinates Δn/2(λ2—1/λ) versus 1/λ in accordance with the experimental observations. However, it has a somewhat larger slope than the corresponding dependence for σ Therefore Δn/σ is found to be only slightly dependent function of λ, i.e. according to the theory presented Bruster's law should hold for rubbers only approximately. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 13 van 14 gevonden artikelen
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