Determination of molecular weight of polyvinylpyrrolidone. II

Abstract

Additional polyvinylpyrrolidone samples of great homogeneity have been prepared, and their intrinsic viscosity and molecular weight (by light scattering) have been determined in water and chloroform. In view of the new results the previous data were reinterpreted particularly with respect to the shift in K (in [η] = KMα) with homogeneity. All data were evaluated by objective statistical techniques and revised intrinsicviscosity molecular weight equations are proposed.

Study of complexes of poly(vinyl pyrrolidone) with copper and cobalt on solid state

“…The MHS (Mark-Houwink-Sakurada) constants used were a ϭ 0.55 and k ϭ 67.6 ϫ 10 3 dL g Ϫ1 . 11,12 The experimental measurements were carried out using an automatic viscometer (Viscoboy 2, Lauda, Kö nigshofen, Germany) by use of a Lauda thermostatic system. We also used different metallic transition element salts such as hexahydrated cobalt II, provided by Panreac Química SA (Barcelona, Spain).…”

Effect of reaction parameters on the dispersion polymerization of 1-vinyl-2-pyrrolidone

“…The viscosity molecular weight was calculated from intrinsic viscosity according to the equation 9,10 [] ϭ 2.4 ϫ 10 Ϫ4 M 0.65 .…”

Spectroscopic and viscometric studies on the interaction of ionic liquid, 1-butyl-3-methylimidazolium bromide with polyvinyl pyrrolidone

“…Also, the intrinsic viscosity of PVP was decreased by increasing temperature [7][8][9][10][11]. Although PVP is easily soluble in water, the results of viscometric investigations indicate that water is not a thermodynamically good solvent for PVP [12][13][14]. In this paper, interactions between 1-butyl-3-methylimidazolium bromide, [BMIm]Br, ionic liquid and PVP were studied using FT-IR, UV-vis spectroscopy and viscometric method.…”