Studies on the Solution of Polyvinyl Acetate

Naito, Ryunosuke

doi:10.1295/koron1944.15.191

Cited by 4 publications

(1 citation statement)

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“…Naito and coworkers9, 10 studied the behavior of the aqueous solution viscosity of PVA at 1–10% concentration. From a detailed study, Naito concluded that each individual molecule is dispersed in water in the form of thread‐filled spheres containing a large amount of water below the inflection point and that interaction (entanglement) occurs between these molecular spheres above the inflection point.…”

Section: Introductionmentioning

confidence: 99%

Effect of molecular weight on the rheological properties of atactic poly(vinyl alcohol)/dimethylsulfoxide/water solution

Lyoo

Lee

Kim

et al. 2004

J of Applied Polymer Sci

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This article describes the molecular weight effect of atactic poly(vinyl alcohol) (a-PVA) on the rheological properties of 7.5, 10.0, and 12.5 g/dL solutions of a-PVA with number-average degrees of polymerization (P n ) of 4000 and 1700 in dimethylsulfoxide/water mixture. a-PVA with a P n of 1700 solutions exhibited almost Newtonian flow behavior, whereas high molecular weight a-PVA, with a P n of 4000 solutions, exhibited shear-thinning behavior. On the plot of storage and loss moduli of a-PVA with a P n of 1700 solutions, the dynamic storage modulus of a-PVA, with a P n of 1700 solutions, was smaller than the dynamic loss modulus over the frequency range of 10 Ϫ1 to 10 2 rad/s. However, the dynamic storage modulus of a-PVA, with a P n of 4000 solutions, was smaller than the dynamic loss modulus in the sol state and, in the postgel state, the dynamic storage modulus became larger than the dynamic loss modulus, indicating the evolution of viscoelastic solid properties. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: [41][42][43][44][45][46] 2004

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Section: Introductionmentioning

confidence: 99%

Effect of molecular weight on the rheological properties of atactic poly(vinyl alcohol)/dimethylsulfoxide/water solution

Lyoo

Lee

Kim

et al. 2004

J of Applied Polymer Sci

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The viscosities of concentrated polymer solutions. I. Moderately concentrated solutions

Hirai

1959

J. Polym. Sci.

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The enormous increases of the viscosity, η, and the associated activation heat, Qη, in concentrated polymer solutions are attributed to the formation of intermolecular linkages between high polymer molecules and to the increase of glass transition temperature with increasing concentration of the solution. In this paper, the effects of the intermolecular linkages on the viscosity of moderately concentrated solutions were discussed. In this concentration range, η and Qη are represented by unique functions of reduced concentration, vR = BMv2, and the following equation was derived for Qη; Here M is the molecular weight of the polymer, v2 is the volume fraction of the polymer, ΔE is the energy to form an intermolecular linkage, B is a constant for the solution, and Qη0 is the activation heat of viscosity for the solvent. The dependency of η on vR shifts from a first power proportionality to a third power at vR = 1/2. The theory was compared with experiments for solutions of cellulose tributyrate in trichloropropane, polyvinyl alcohol in water, polyvinyl acetate in acetone, and polyisobutylene in xylene.

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