Cross-linked polymers, susceptibility operators

It was proved experimentally, that expressions (4) and (5) are effective only for hyperelastic state of cross-linked polymers. To describe change of strain electromagnetic anisotropy in all cross-linked polymers physical states will consider strain electromagnetic susceptibility s C (MPa" ) and electromagnetic susceptibility elastic coefficient s relaxation operators. Suppose that they are submitted by such appropriateness, by which equilibrium properties in equation (5)... 

From Equation (7) follows conclusion about the same relaxation spectrum for strain electromagnetic susceptibility and shear pliability. This means that deOied cooperative mobility of polymer meshe s points a-relaxation times spectrum reproduces both strain and electromagnetic response of cross-linked polymer system to external mechanical force. It should be noted that as well as shear pUability s relaxation operator, strain electromagnetic susceptibility s relaxation operator generalizes in it is record all physical states of cross-linked polymers. 

Deberdeev, T. R., Ulitin, N. V., and Deberdeev, Vi-Ya. An operator form of strain electromagfietic susceptibility of cross-linked polymers with the new instant component submission (2012). 

Then, in concordance with Equation (5), shear pliability and strain electromagnetic susceptibility relaxational spectrums are identical. In conclusion of mathematical model s account it should be noted that operator C in it is record deOies strain electromagnetic susceptibility in every physical state of densely cross-linked polymers, so as operator / [4],... 

Owing to their cross-linked network, thermosetting resigns are principally known to be less susceptible to corrosion than some thermoplastic materials. Nonetheless, as shown by Bornbaum (2010), a prediction of long-term stability of polymers in fuel cell operation is hardly possible. Thus, the immersion or accelerated lifetime test should be applied on every novel material which has not been operated successfully in a fuel cell over a several thousand hours. These tests may save considerable amounts of time and can be performed before a fuel cell is set up. Nevertheless and finally, only a long-term test in fuel cells at various parameters and different conditions can provide ultimate certainty as to whether a newly developed composite is suitable or not. 

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