The aggregate model and mechanical anisotropy

In this model it is proposed that the polymer can be considered as an aggregate of identical units, which in the unstretched state are oriented randomly. As orientation develops, the units rotate and become completely aligned at the maximum achievable orientation. The elastic properties of the units are those of the mostly highly aligned structure, which could be a fibre with transverse isotropy or a film with orthorhombic s3onmetry [40]. In this chapter the theory will be developed for a fibre, where both the fibre and the structural units possess transverse isotropy. 

Can the elastic constants of the isotropic polymer be deduced from measurements on the most highly oriented sample  

Does the mechanical anisotropy develop with orientation in the predicted 

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