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Hydrodynamic properties of molecules of polyvinylpyrrolidone as shown by sedimentation-diffusion analysis and viscometry
- Source :
- Polymer Science U.S.S.R.. 32:1119-1126
- Publication Year :
- 1990
- Publisher :
- Elsevier BV, 1990.
-
Abstract
- The authors have measured the coefficient of translational diffusion D0, the sedimentation coefficient S0 and the intrinsic viscosity [η] of samples and fractions of polyvinylpyrrolidone in 0.1 M sodium acetate solution in the interval MW 2 ⩽ M × 10−3 ⩽ 2200. In the region M > 4 × 104 they obtained the relation: [η] = 8.86 × 10−5M0.74; D0 = 2.42 × 10−4M−0.58 and S0 = 2.14 × 10−15M0.42. In the region M⩽4 × 104: [η] = 5.0 × 10−4M0.56, D0 = 1.29 × 10−4M−0.52 and S0 = 1.15 × 10−15M0.48. The values of the hydrodynamic invariant A0 = (3.2 ± 0.25) × 10−10 erg degree−1 mole13, sedimentation parameter βs = (1.3 ± 0.17) × 107mole13, temperature viscosity coefficient negative: Δ ln [η]/ΔT = −6.3 × 10−3 degree−1. From the theory of the hydrodynamic properties of a worm-like necklace taking into account the influence of the effects of excluded volume an evaluation is made of the equilibrium rigidity A and the hydrodynamic diameter d of the chains modelling the macromolecules in solution. The evaluations of A agree with the values obtained from the Burchardt-Stockmayer-Fixman and Cowie-Bywater constructions: A = (2.1 ± 0.3) nm, d = (0.5 ± 0.13) nm.
Details
- ISSN :
- 00323950
- Volume :
- 32
- Database :
- OpenAIRE
- Journal :
- Polymer Science U.S.S.R.
- Accession number :
- edsair.doi...........5a828465339536fc584995f96a159e80
- Full Text :
- https://doi.org/10.1016/0032-3950(90)90166-4