Kuhn statistical step lengths

Values of domain size and separation were discussed in terms of Helfand s NIA theory, tacitly assuming that the two components of the block copolymer constituted a symmetric polymer pair, i.e. equality of Kuhn statistical step lengths, b, and monomer molar density. Whilst this is approximately true for values of b for styrene and isoprene, the densities are quite different. However, calculations of domain size and domain separation as a function of molecular weight for both styrene and isoprene domains show that both types have the same molecular weight dependence and moreover the difference in the values for either styrene or isoprene domains is negligible. Figure 10... 

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