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- W2085956294 abstract "A conformational analysis of isotactic chains of the — (CH2—CHR—O—x— type, with a symmetrical substituent R (R=C(CH3)3, CF3 or CH3), has been made. The matrices of the statistical weights of the interactions of atoms and atomic groups separated by three and four bonds in these chains have been obtained, and the unperturbed dimensions (h02)12 and their temperature coefficients (UDTCs) were calculated. The unknown energies of activation were estimated by comparison of the calculated and experimental values of (h02)12 and the UDTCs. It is shown that increase in the size of the substituent reduces the probability of slightly coiled conformations and increases the probability of highly coiled conformations. Whereas when R is CH3 the number of conformations of the repeating unit of equal probability is large, when R is C(CH3)3 there is only one preferred highly coiled conformation. It was found that there is a correlation between the conformational flexibility of the chain expressed in terms of the degree of hindrance to internal rotation, σ, and Taft's steric constant of the substituent, Es = 3·4−2·0σ." @default.
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- W2085956294 date "1978-01-01" @default.
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- W2085956294 title "The conformational statistics of isotactic chains of the —(CH2—CHR—O—)x— type, with a symmetrical substituent" @default.
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- W2085956294 doi "https://doi.org/10.1016/0032-3950(78)90311-8" @default.
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