With due consideration for the interaction between chain elements within a high polymer molccule and that between chain element and solvent molecule, we can write the formula for the root mean sguare end-to-end distance of the high polymer molecule in solution as
r=αbN
1/2.
where be is the effective bond length, N the degree of polymerization, and α the factor introduced to represent the expansion ratio of the real chain to the ideal one.
The present author determined α and b and so r of the Polystyrene in benzene solution from the measurement of intrinsic viscosity [η].
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