Linear conditions in chain systems with neighbour interaction. II. Application of structural conditions: Atactic polypropylene

It is shown here how the theory proposed in the preceding paper may be applied to the conformational analysis of atactic polymers as well as of oligomers in solution. The calculation of the free mean-square lengths of polypropylenes with various types and degrees of tacticity is discussed in detail. In particular, the chain distributions of d and I units, coresponding to the models taken into consideration, are closely represented by the MARKOFFian law. The agreement between our results and those obtained by FLORY et al. through Monte-Carlo calculations is substantially good. The reasons why the configurational defects in nearly isotactic poly-α-olefins should be more closely represented by the (… dddlddd …) sequences than by the (… dddlll …) ones proposed by FLORY, avidenced.