Flow birefringence and the conformational characteristics of polyamidehydrazide molecules in dimethylsulphoxide

Pogodina, N.V.; Starchenko, L.V.; Khrustalev, A. Z.; Tsvetkov, V.N.

doi:10.1016/0032-3950(84)90139-4

Cited by 3 publications

(3 citation statements)

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“…Assuming a circular cross-section for the chain, a chain diameter of 5.1 A was calculated according to d = (~M L / T N A~~)~/ ' (12) where pz is the polymer density (1.48 g/mL).3…”

Section: Methodsmentioning

confidence: 99%

“…We used the 514.5-nm line to avoid absorption of the incident light known to occur for X-500 in solution at lower wavelengths.6 Vertically polarized incident light is focused by a 15-cm focal length lens into the center of a Brookhaven Instruments Model E083 temperature controlled vat. Borosilicate glass tubes, 12 mm, fitted with ground-glass joints serve as sample cells.…”

Section: Methodsmentioning

confidence: 99%

“…Ml was taken as 18.2 Da/Á (Da = dalton) corresponding to the ratio of the molecular weight of the repeat unit (M0 = 281 g/mol) to the length of the repeat projected onto the contour of the chain (l0 = 15.4 Á). Ml is related to the contour length by (M)v/Ml = <L>W (11) Assuming a circular cross-section for the chain, a chain diameter of 5.1 A was calculated according to d = (4 1/ 2)1/2 (12) where p2 is the polymer density (1.48 g/mL).3…”

Section: Instrinsic Viscosity Table V Summarizes Values Ofmentioning

confidence: 99%

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Static and dynamic light scattering studies of poly(terephthalic-4-aminobenzohydrazide) in dimethyl sulfoxide

Krigbaum¹,

Brelsford²

1988

Macromolecules

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Ballet, D.; Viallard, A. J. Chem. Thermodyn. 1974, 6, 895. Otin, S.; Thomas, G.; Peiro, J. M.; Velasco, I.; Gutierrez Losa, C.ABSTRACT Eleven narrow fractions between 3.78 X lo3 and 2.62 X lo5 g/mol of poly(terephthalic acid-4-aminobenzohydrazide) were studied in dimethyl sulfoxide. The molecular weight dependence of the intrinsic viscosity, molecular anisotropy, radius of gyration, and the diffusion coefficient, Do, was used to derive a persistence length, q, of 105 h 10 A. The trend found in Do, being less sensitive to chain expansion in a good solvent, supports the neglect of correcting molecular dimensions for the excluded-volume effect. An application of the Yamakawa-Stockmayer treatment for the expansion factor, as, for wormlike chains shows that the Kuhn limit is reached a t nearly 6 X lo4 g/mol while a: does not exceed 1.05 at a molecular weight of 2 X lo5 g/mol.

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“…Assuming a circular cross-section for the chain, a chain diameter of 5.1 A was calculated according to d = (~M L / T N A~~)~/ ' (12) where pz is the polymer density (1.48 g/mL).3…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%