Kinks hypothesis

The fact that deformation is intimately connected with the deformation of randomly kinked molecules first arose from the study of rubber as a mere hypothesis, which, in the meantime, may be considered as being very well supported. 

Hypothesis on the conformational change of hydrocarbon chains, in which a kink is defined as the dihedral angle sequence of gauche-h, trans, gauche— or gauche—, treats, gauche- -, and it is conceived as a mobile stractural defect. Lattice model... 

Iir.2.2. Another hypothesis is that the transition is due to a helix-coil-like transidem. This hypothesis has been proposed by Boyer for the transition in poly(4-mediyl pentene-1) (P4MF1) which crystallizes in a helical conformation. Closely related is the idea of die saturation of a chain molecule with defect-like kinks reuining the local chain axis. would then mark die stability limit of these chain stiuctures. In n-alkanes this special process of defect incorporation already starts in the solid phase. ... 

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