Theoretical study of the molecular structure of the amorphous regions in oriented semicrystalline polymers

The earlier results of Monte Carlo modeling and calculations according to the theory of quasi-equilibrium molecular structure are compared with the calculations for asymmetric random walk. The quantitative differences in the estimated fractions and average lengths of subchains in amorphous regions are maximal in the unoriented state and level out with an increasing draw ratio. The predictions of the model of anisotropic (symmetric) walk differ drastically from the results of the former models. Monte Carlo modeling showed that with the backward step being forbidden, these differences substantially diminish. The conclusions on the dependences of fractions and average lengths of the tie chains on the draw ratio are qualitatively similar in different theoretical models.