Abstract
Abstract We have measured the elastic constants of an oriented polymer, below its glass transition temperature. The polymer is a main chain nematic polymer and the nematic order is quenched in the solid state. The elastic properties are strongly anisotropic and we observe a violation of a usual symmetry rule. We show that internal stresses can explain this latter point. Then, our experiment could evidence the importance of internal stresses in an understanding of the elastic properties of amorphous solids.
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