Macromolecule cross-sectional area

That is, molecular friction value is independent on the size of particles, forming a cluster (in the considered case - macromolecule cross-sectional area). 

Equation 2.7 gives two forms of analytical relation between d and fractal dimension depends not only on the order parameter value (p, but also on the polymer s molecular characteristics (C and 5), where is the characteristic ratio, which is an indicator of polymer chain statistical flexibility [42], S is a macromolecule cross-sectional area. This is the reflection of the above-mentioned rule, that for description of a polymer s condensed state structure, as a minimum two order parameters are required [12, 25]. 

Proceeding from the value of dj it is easy to calculate the macromolecule cross-sectional area S, which turns out to be equal to 29.83 for PCP. This value is close to experimentally determined values of S for polymers, similar by chemical structure to PCP. So, for ds-polyisoprene S = 28 [19]. 

Sv y, where S is the macromolecule cross-sectional area, v is the critical nucleus functionality. In paper [46] the dependence of on A, for polyethylene was... 

At present it is well known [26-28] that a change in the crosslinking density for crosslinked polymers results in a number of important variations in characteristics glass transition temperature T, mechanical properties and so on. In turn, for linear polymers correlations between molecular characteristics exist, for example, between macromolecule cross-sectional area 5, chain rigidity a and their macroscopic properties [2, 24, 29, 30]. It can be expected that chemical crosslinking exercises influence the molecular characteristics of crosslinked polymers thereby influencing their structure and properties. 

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