Determination of the flexibility parameter of polymers

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Abstract
This paper deals with the determination, in theta conditions, of the flexibility parameter λ defined by Kratky-Porod for random-coiled polymers, using three different methods: (a) from hydrodynamic data in θ conditions, (b) by using a new form of extrapolation to zero of the corresponding values for the average molecular weight, and (c) by extrapolation of λ tending to zero. From method (b), values of the interaction parameter, B, were in agreement with those from Stockmayer-Fixman theory. A linear relationship was obtained from (c) by plotting (R2/L)½ versus λ. The slope, h*, of this plot was found to be related with λθ in the following way: where A1 and A2 are constants, and h is the monomeric unit projection length in terms of the wormlike theory.

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