Vinyl polymers intramolecular structure functions

As a first approximation " one can model the vinyl polymer as a freely jointed, tangent hard sphere chain as depicted on the second line of Figure 1. Thus each bond (of fixed length) is completely flexible with each site, including the side group site C, acting as a universal joint. Invoking the Flory ideality hypothesis, the intramolecular structure functions in Eq. (2.4) become "... 

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