Lattice model for segmental orientation in deformed polymeric networks

Segmental orientation in elastomeric networks under uniaxial deformation is traditionally expressed by the simple expression. The effect of intermolecular interferences has first been considered in a lattice model by DiMarzio. Tanaka and Allen and Jarry and Monnerie later attempted to improve the work of DiMarzio. The present study demonstrates that a first order transition from a relatively disordered to a highly ordered structure is expected to occur upon stretching of networks of semi-rigid chains. The latter is evidence by an abrupt increase in the orientation function in network chains with sufficiently large stiffness and subject to substantial deformation. The transition is expected to occur more readily in the presence of anisotropic intermolecular interactions favoring parallel alignment of neighboring chains.