Physico-chemical study of ionic equilibria for poly-2 and poly-4-vinylpyridines in alcohol-water solutions

Kirsh, Yu. E.; Komarova, O.P.; Луковкин, Г.М.

doi:10.1016/0014-3057(73)90110-9

Cited by 70 publications

(38 citation statements)

References 17 publications

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“…Aromatic tertiary amine groups of pyridine rings define relatively low pK b ϭ 3.25 29 of poly(4-vinylpyridine) that, in turn, determines the observed shift of the ⌰-pH profile in neutral media (curve 1 in Figure 9). Thus, in this particular case the possibility of fine pH control of PEC dissociation is realized in convenient pH region.…”

Section: Pei-mentioning

confidence: 99%

Controllable stability of DNA-containing polyelectrolyte complexes in water-salt solutions

1999

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Section: Pei-mentioning

confidence: 99%

Controllable stability of DNA-containing polyelectrolyte complexes in water-salt solutions

1999

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“…Because pK a of P2VP depends on the ionization degree, five is not the actual pK a , but rather a critical pH at which micellization occurs [18]. In this work, the effect of pH change on the micellar size has been studied by DLS, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Morphology of core-shell-corona aqueous micelles: II. Addition of core-forming homopolymer

LEI

2004

Polymer

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The poly(styrene)-block-poly(2-vinylpyridine)-block-poly(ethylene oxide) triblock copolymer PS 200 -b-P2VP 140 -b-PEO 590 , where the subscripts refer to the number average degrees of polymerization, forms spherical micelles in water, that consist of a PS core, a pH-responsive P2VP shell and a PEO corona. This triblock has been added with homo-PS before micellization in order to increase the volume fraction of the core-forming block. The length of the added homo-PS has been varied with respect to the length of the PS core-forming block: much shorter, much longer and approximately the same. The structure of the micelles has been investigated by transmission electron microscopy, static and dynamic light scattering. Homo-PS phase separates whenever its length is larger than the one of the PS core-forming chains; otherwise this phenomenon occurs beyond a critical concentration that depends on molecular weight. The addition of homo-PS has no influence on the morphology of the micelles and on the characteristic size of both the PS core and the P2VP shell, although the hydrodynamic diameter of the micelles is decreased. Substitution of styrene for homopolystyrene results in transition from a spherical to a dominant rod-like morphology.

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“…[12] During the quaternization reaction, the percentage of alkylated groups was determinated by conductimetric titration of bromide ions with AgNO 3 in methanol. An aliquot 1 ml was taken with a pipette and diluted with 20 ml of ethanol.…”

Section: Apparatus and Measurementsmentioning

confidence: 99%

Series of Poly(4‐vinylpyridine) Containing Quaternary Alkyl bromides: Synthesis and Determination Percentage of Quaternization

Medjahed

Tennouga

Mansri

2014

Macromolecular Symposia

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Summary: In this study, we focus on the synthesis series of poly(4-vinylpyridine) (P4VP) containing quaternary alkyl bromides. The poly(4-vinylpyridine) (P4VP) was synthesized by conventional radical copolymerization and then the P4VP was quaternized by alkyl bromides containing chains consisting of 5 and 10 carbon atoms. Two copolymers series with three degrees of polymerization have been synthesized, the first poly[N-isopentyl(4-vinylpyridinium)] bromide P4VPIPBr (I); (II); (III) and the second poly[N-decyl(4-vinylpyridinium)] bromide P4VPBrD (I); (II); (III). The following techniques have been used to characterize the structure and composition of the cationic copolymers (P4VPIPBr) and (P4VPBrD), HNMR, conductimetry and viscometry.

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Physico-chemical study of ionic equilibria for poly-2 and poly-4-vinylpyridines in alcohol-water solutions

Cited by 70 publications

References 17 publications

Controllable stability of DNA-containing polyelectrolyte complexes in water-salt solutions

Controllable stability of DNA-containing polyelectrolyte complexes in water-salt solutions

Morphology of core-shell-corona aqueous micelles: II. Addition of core-forming homopolymer

Series of Poly(4‐vinylpyridine) Containing Quaternary Alkyl bromides: Synthesis and Determination Percentage of Quaternization

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