Formation of particles of a new phase in dilute aqueous solutions of polyethylene oxide

Klenin, V. I.; Kolnibolotchuk, N. K.; Solonina, N. A.

doi:10.1016/0032-3950(88)90356-5

Cited by 2 publications

(3 citation statements)

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“…Second-level SMP are formed during thermostating of crystallizable polymer solutions within wide ranges of temperature and concentration. The kinetics of this process shows each and every indication of polymer crystallization in the presence of a solvent [1][2][3][4][5][6][7][8][9][14][15][16][17]. The temperature dependence of the second-level SMP formation rate goes through a maximum.…”

Section: Formation Of a Second Level Of Supramolecular Ordermentioning

confidence: 99%

“…Our previous series of experiments [1,2] has revealed no liquid-liquid phase separation range in the poly (vinyl alcohol) (PVA) + water system at least below 150°C. Therefore, those SMP which are present in solution on visual dissolution (the first level of supramolecular order (SMO)) or formed with in wide temperature and concentration ranges are of crystal nature [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Hence, the structure of PVA solutions is generally the same as in any solution of a crystallizable polymer.…”

Section: Introductionmentioning

confidence: 99%

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Structure of Crystallizable Polymer Solutions

Klenin¹,

Fedusenko²

2014

J. Res. Updates Polym. Sci.

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Visually transparent solutions of crystallizable polymers in wide concentration and temperature ranges contain supramolecular particles which are fragments of the most perfect crystallites of condensed polymer. Though the fraction of these particles is usually with in 0.001-0.1wt % of the total polymer, their presence in a solution of macromolecules severely affects its physicochemical and technological properties (performance) and complicates (or even does not allow) the application of structurally-sensitive research techniques (e.g. lights cattering, dynamic birefringence, etc.). The parameters of the first-level supramolecular particles (just after visual dissolution) depend on the conditions of dissolution, storage, and the preliminary treatment temperature of the polymer. In wide polymer concentration and temperature ranges, a second level of the supramolecular particles ensemble is formed, with characteristic features of crystallization. From the formation rate of the second-level supramolecular particles, a microliquidus curve for them can be plotted. The paper presents data for the poly (vinyl alcohol) + water system which lack the area of liquid-liquid phase separation. Supramolecular particles parameters (average sizes, numerical and mass-volume concentration) were determined by means of the turbidity spectrum method.

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