A number of narrow-distribution fractions of poly(terephthaloyl-trans-2,5-dimethylpiperazine) (PTDP) ranging in Mw (weight-average molecular weight) from 5,000 to 300,000 were prepared, and their molecular weights, z-average mean-square radii of gyration 〈S2〉z, second virial coefficients A2, and intrinsic viscosities [η] in appropriate solvents were measured. Trifluoroethanol (TFE) was used for the light-scattering study and m-cresol and TFE for the viscosity study. It was found that the observed data were quantitatively interpretable in terms of the Benoit—Doty theory for ‹S2› and the Yamakawa—Fujii theory for [η] of unperturbed wormlike chains. The persistence lengths q obtained in TFE and m-cresol were about 70 Å, which suggests that the PTDP chain is fairly stiff. This q value is about 1.5 times larger than that of poly(phthaloyl-trans-2,5-dimethylpiperazine) (PPDP) in m-cresol. PPDP and PTDP differ only in the position at which the phenyl ring is linked to the piperazine ring.
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Motowoka, M., Fujita, H. & Norisuye, T. Stiff Chain Behavior of Poly(terephthaloyl-trans-2,5-dimethylpiperazine) in Dilute Solution. Polym J 10, 331–339 (1978). https://doi.org/10.1295/polymj.10.331
- Wormlike Chain
- Persistence Length
- Dilute Solution
- Light Scattering
- Intrinsic Viscosity
- Optical Anisotropy
- Yamakawa—Fujii Theory
- Benoit—Doty Theory
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