Abstract
Theoretical calculations on the mean square unperturbed end-to-end length ‹R0sub2› of poly(N-methyl glycine) chains in random coil form were carried out in accordance with presumed conformations of imide bonds in the chains. Two cases were taken into account: in the first case, all the imide bonds were assumed to be in trans conformation, and in the second case, a trans imide sequence was assumed to be interrupted by an isolated cis imide bond. In the former case, numerical calculations were carried out on two different approximations about nonbonded interactions by adopting the method used for poly-α-L-amino acids with amide bonds all in trans conformation, and resulted in the unperturbed characteristic ratios of 1.46 and 1.53 for each case. In the latter case, a theoretical expression was proposed. These results on theoretical calculations were satisfactorily in accord with the experimental results.
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Tanaka, S., Nakajima, A. Conformation of Poly(N-methyl glycine) Random Chains. Polym J 1, 71–81 (1970). https://doi.org/10.1295/polymj.1.71
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DOI: https://doi.org/10.1295/polymj.1.71