Macromolecular Properties of Polyvinylpyrrolidone:Molecular Weight Distribution

Miller, Lynnette; Hamm, Fritz

doi:10.1021/j150502a024

Cited by 51 publications

(4 citation statements)

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“…Formulation RA15-0 had slightly higher absorption than the control and kept about 1-percent moisture gain after 5 months. The leveling off of moisture absorption by RA15-40 at 2.5 percent appears to fall in line with Miller and Hamm's report 6 that every mole of PVP monomer unit tends to keep 1/2 mole of hydrated water. According to calculation, RA15-40 and RA15-20 could retain respectively 1.9-and 1.1-percent moisture due to PVP.…”

Section: Water and Moisture Absorption And Its Reduction With A Coatingsupporting

confidence: 85%

Alcohol-Sensitive Epoxy Formulations for Temporary or Repairable Embedment

Lee¹,

Bruce²

1976

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Section: Water and Moisture Absorption And Its Reduction With A Coatingsupporting

confidence: 85%

Alcohol-Sensitive Epoxy Formulations for Temporary or Repairable Embedment

Lee¹,

Bruce²

1976

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“…Biggs 37 reports that PVP adsorbed on zirconia extends 2−3 R g ( R g , radius of gyration) from the adsorption surface in a good solvent. R g of PVP ( M w = 41 000) is approximately 17 nm . Biggs also notes that the probe's point of zero separation for a bare surface does not correspond exactly with the zero point for an adsorbed surface due to the incompressible polymer layer sandwiched between the solid surface and the probe in the latter case. , That the zero distance is defined as a constant compliance between a cantilever deflection and a piezo movement is a limitation of the colloidal probe technique.…”

Section: Resultsmentioning

confidence: 99%

Interaction Forces on α-Alumina Surfaces with Coadsorbed Anionic Surfactant and Nonionic Polymer

2002

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Direct measurements of interaction forces between R-alumina surfaces with coadsorbed anionic surfactant (sodium dodecyl sulfate (SDS) or lithium perfluorooctanesulfonate (LiFOS)) and nonionic polymer poly-(vinylpyrrolidone) (PVP) at pH 3.5 are carried out by colloidal probe atomic force microscopy. In aqueous SDS solutions, the strength of interaction forces is found to depend on the initial SDS concentration, whereas in PVP solutions, the electric double layer interaction is completely screened due to the flat conformation of PVP on R-alumina. The interaction forces are dramatically different for the coaddition of SDS and PVP: electrostatic repulsion is observed above the critical aggregation concentration, and virtually no steric hindrance due to adsorbed polymer chains can be detected. These coaddition effects are attributed to the flat conformation of the adsorbed PVP and the formation of SDS-PVP surface complexes as confirmed by surface tensiometry. The LiFOS-PVP system exhibits characteristics similar to those of the SDS-PVP system, except that the repulsion between adsorbed LiFOS layers is remarkably weak at concentrations above its critical micelle concentration. The effects of sequential addition of SDS and PVP are also investigated.

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“…Heterogeneity of PVP was calculated by Miller and Hamm (7) from free diffusion and with schlieren optics; other methods, by means ofwhich the molecular weight distribution ofa polymer may be obtained from diffusion data, are at hand (6, 8-11); however, the use of a diaphragm cell for this purpose has been hitherto disre-garded, as far as we know. Satterfield, et al (12,13) have made measurements of restricted diffusion of polymers in liquids within fine pores but their aim was rather to find corre 1 at ion b e t w e e n t h e effective diffusion coefficients and the ratio of macromolecular diameter to pore diameter.…”

Section: Introductionmentioning

confidence: 99%

Estimation of molecular weight distribution of poly(vinylpyrrolidone) from diaphragm‐cell diffusion measurements

Comelli¹,

Francesconi²,

Lanzi³

1980

Polymer Engineering & Sci

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Viscometry, gel permeation chromatography (GPC) and diffusion measurements on three samples of poly(vinylpyrrolidone) (PVP) were made. The diffusion measurements were carried out by means of a Stokes cell. An equation with five parameters was derived, linking the difference in PVP amount between the two compartments of the cell to the time of the experiment: three parameters are related to the diffusional behavior of the macromolecules and the other two define the molecular weight distribution (the Tung expression has been chosen). A least‐squares procedure allowed us to obtain the five parameters and the calculated weight average molecular weights agree with the ones evaluated by viscometry and GPC. The ratio Mw/Mn (heterogeneity of the polymer) calculated from the parameter z of the Tung expression is very different from the one obtained from GPC.

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Macromolecular Properties of Polyvinylpyrrolidone:Molecular Weight Distribution

Cited by 51 publications

References 0 publications

Alcohol-Sensitive Epoxy Formulations for Temporary or Repairable Embedment

Alcohol-Sensitive Epoxy Formulations for Temporary or Repairable Embedment

Interaction Forces on α-Alumina Surfaces with Coadsorbed Anionic Surfactant and Nonionic Polymer

Estimation of molecular weight distribution of poly(vinylpyrrolidone) from diaphragm‐cell diffusion measurements

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