Studies of Poly-2-vinylpyridine. III. Intrinsic Viscosity and Molecular Weight

Abstract

The viscosity, osmotic pressure and light-scattering of a series of 14 fractions of poly-2-vinylpyridine in various solvents have been measured. The following results have been obtained: The constants, Kw′ and v, in the Mark-Houwink equation have been determined for the solutions of: (a) 92.01 weight per cent ethanol, (b) methanol, (c) dimethylformamide, (d) benzene and (e) dioxane as follows: (a) [η]=1.22×10−4Mw0.73 (d) [η]=1.70×104Mw0.64 (b) [η]=1.13×104Mw0.73 (e) [η]=3.09×104Mw0.58 (c) [η]=147×10−4Mw0.67 The molecular weight of the polymers ranged from 3.4×104 to 93×104, while the viscosity was measured at 25±0.01°C. The constant, K′ in the Mark-Houwink equation in the case of a homogeneous molecular weight has been calculated assuming the exponential- and logarithmic normal-type molecular weight distribution functions for each fraction. The Flory constant, K, defined as [η]θ=KM1⁄2 has been found by the method of Fixman and Krigbaum to be: (8.7±1.0)×10−4 at 25°C. The K value has also been found to be (9.1±1.1)×104 by measuring the intrinsic viscosity in benzene at the θ-point, 16.2°C. The short range interactions of this polymer have also been discussed.

Preparation and Characterization of Poly(2-vinylpyridine) with Narrow Molecular Weight Distributions

“…This 8-temperature considerably differs from those obtained by Dondos 13 (15°C) and Arichi 14 (16.2°C). The difference may arise from differences either in purity of the solvents used or in tacticity of the samples obtained.…”

Mesomorphic State of Poly(vinylpyridine)-Dodecylbenzenesulfonic Acid Complexes in Bulk and in Xylene Solution

“…The molar mass of PSVP was determined by viscosimetry in methanol using [VI = 1.13 x 10-3Mv0.73. 13 The molar mass of P4VP was determined by viscosimetry in ethanol using [VI = 2.50 x 10-4M,0.6.14 The xylene solutions were prepared from PSVP and P4VP provided by Polyscience Europe GmbH. The molar masses of P2VP (M, = 330 000) and P4VP (M, = 49 000) were determined in DMF13 and in absolute ethanol,l4 respectively.…”

Mixed monolayers of polyvinylpyridine and low-molecular-weight substances

“…The substances used in this study were as follows: potyvinylpiridine (PVP) supplied by Aldrich Chemical Co., with an average molecular weight of 250,000, determined viscosimetrically using Shizuo Arichi's constants [6]; extremely pure stearic acid supplied by Messrs. Carlo Erba, Milan, Italy ; extremely pure methyl stearate supplied by Merck, Darmstadt; extremely pure stearyIamine supplied by Sigma Chemical Co., Munich.…”