Chain persistence length

The first property can be deduced from the results of Section 1.02.5.2. Concentration fluctuations are weak since the melt compression modulus is high cv tl, where c is the concentration of repeat rmits. The correlation length of density fluctuations f is defined in eqn [96] which is qualitatively applicable for cv 1 giving that is, f is comparable with the statistical segment b for the standard beads-and-springs chain model. (More generally f in a polymer melt is comparable with the chain persistence length I)... 

Gaussian or freely jointed models (see also Section IV.D), which lack completely the local rodlike stiffness on length scales comparable and shorter than the chain persistence length. 

The definition of a segment stiffness depends on its nature. If a long stiff segment can be described as a worm-like chain, characterized by a particular smooth and uniform curvature, then the chain persistence length is a good initial descriptor. For a hypothetical worm-like chain of contour length L and statistical mechanical average square of the unperturbed end-to-end distance o, it was shown by Porod and Kratky [49,50], that in the limit of L -> oo,... 

In general, the conformation of polyelectrolyte is determined by the total chain persistence length (Ip) which represents the effective rigidity of the polyelectrolyte chain. Ip is the sum of Iq and the electrostatic persistence length (le) [52] ... 

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