Molecular properties of poly(carboxybetaine) in solutions with different ionic strengths and pH values

Лезов, А. В.; Vlasov, Petr S.; Домнина, Н. С.; Polushina, G. E.

doi:10.1134/s0965545x11110058

Cited by 11 publications

(8 citation statements)

References 17 publications

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“…As previously discussed, the R h shift may be attributed to a change in the aggregation number because of the altered thermodynamic equilibrium states rather than stretching of PGLBT segments on PSPE cores. As several reports , and our DLS study on homo-polycarboxybetaine in NaCl (aq) and NaF (aq) (Figure S6) showed no remarkable size variation of polycarboxybetaine motifs within the salt concentration range, the size changes of the micelles might be the result of the enthalpy and entropy of mixing change driven by attenuated dipole–dipole attractions. The R h variations of unimers were analogous to the trend of polysulfobetaine homopolymers in salt solutions at moderate concentrations, wherein ions more chaotropic than Cl – led to a decrease of R h before full swelling at much higher salt concentrations.…”

Section: Resultssupporting

confidence: 82%

Effects of Halide Anions on the Solution Behavior of Double Hydrophilic Carboxy-Sulfobetaine Block Copolymers

Lim

Matsuoka

Saruwatari³

2020

Langmuir

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The solution behavior of the double polybetaine block copolymer poly(2-((2-(methacryloyloxy)ethyl)dimethylammonio)acetate)-block-poly(3-((2-(methacryloyloxy)ethyl)dimethylammonio)propane-1-sulfonate (PGLBT-b-PSPE) in sodium halide aqueous solutions was investigated. In the presence of salt ions, the unimer-to-micelle transition of PGLBT-b-PSPE that originated by Coulombic attraction between PSPE motifs was suppressed and shifted to much lower temperatures. The transition was hindered more by increases in the salt concentration because of additional counterion binding on the ionized site of PGLBT-b-PSPE chains, which screens the dipole–dipole attractions. The specific ion effect was investigated on four different halides, Cl–, Br–, I–, and F–. Cl– and two chaotropes (Br– and I–) apparently prevented micelle formation, and the hindering effectiveness on the PSPE pairing followed the general Hofmeister series of anions: I– > Br– > Cl–. More chaotropic anions strongly maintained the polymer chains in a fully hydrated state when the same amount of salts was incorporated. However, F–, which is classified as a kosmotrope, only made a small contribution to lowering the transition point and led to abrupt transition without showing a gradual phase change prior to the transition. The variations of hydrodynamic radius and zeta potentials of unimers and micelles gave hints of the solvation state of salt-incorporated PGLBT-b-PSPEs in each state. These results suggest that chaotropic halides tend to exist in the vicinity of the diblock polybetaine chain surface and thus prominently influenced the thermoresponsive solution behavior, whereas kosmotropic F– prefers water molecules and causes minor changes in the PGLBT-b-PSPE aqueous solution.

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Section: Resultssupporting

confidence: 82%

Effects of Halide Anions on the Solution Behavior of Double Hydrophilic Carboxy-Sulfobetaine Block Copolymers

Lim

Matsuoka

Saruwatari³

2020

Langmuir

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“…In fact, it seems that nearly the full spectrum of polymerizable groups suited for radical polymerization has been used to make polyzwitterions in the past, including not only styrenes, vinylpyridines, vinylimidazoles or vinylesters [124], but also rather uncommon polymerizable groups such as dienoic acids [123,124,[131][132][133][134][135][136][137][138][139], vinylcyclopropanes [124,134] or isocyanides [69], and cyclopolymerizing species such as diallylammonium [64,87,88,124,134,[140][141][142][143][144][145][146][147][148][149][150][151][152][153] and closely related divinyl monomers [93,94]. Moreover, a number of monomers confined exclusively to (often alternating) radical copolymerization, such as vinylethers [124,134], fumarates and maleates [124,134,[154][155][156], isobutylenes [157] and ...…”

Section: Synthesis By Chain Growth Polymerizationsmentioning

confidence: 99%

“…This has resulted in a continuous interest in zwitterionic diallylammonium carboxy-, phosphono-and sulfobetaines (cf. Figure 16, P-68 and P-69) [64,87,88,124,134,[140][141][142][143][144][145][146][147][148][149][150][151][152][153]431,433].…”

Section: P-70mentioning

confidence: 99%

Structures and Synthesis of Zwitterionic Polymers

2014

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Abstract:The structures and synthesis of polyzwitterions ("polybetaines") are reviewed, emphasizing the literature of the past decade. Particular attention is given to the general challenges faced, and to successful strategies to obtain polymers with a true balance of permanent cationic and anionic groups, thus resulting in an overall zero charge. Also, the progress due to applying new methodologies from general polymer synthesis, such as controlled polymerization methods or the use of "click" chemical reactions is presented. Furthermore, the emerging topic of responsive ("smart") polyzwitterions is addressed. The considerations and critical discussions are illustrated by typical examples.

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“…This is known as the antipolyelectrolyte effect . At present, many betaine zwitterionic polymers have been reported, such as sulfo‐, carbo‐, and phospho‐ betaine zwitterionic polymers . They have been applied in bioseparations, DNA assay, and many other fields .…”

Section: Introductionmentioning

confidence: 99%

The solution behavior of hydrophobically associating zwitterionic polymer in salt water

Hong

Wang

et al. 2013

J of Applied Polymer Sci

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The acrylamide-based hydrophobically associating zwitterionic polymer was prepared, which was composed of dimethyldodecyl-allyl ammonium chloride as hydrophobic group and carboxyl betaine 2-(4-acrylamido-propyl-dimethyl ammonic)-sodium acetate as functional group. Hydrophobically associating polyacrylamide (HAPAM) was also prepared for comparative study. The behaviors of polymers in pure water and salt solutions were investigated by the means of apparent viscosity test, laser light scattering, atomic force microscope, and fluorescence experiments. The viscosities of polymer solution increased with the increasing of salt concentration, which indicated that the addition of salt resulted in significant antipolyelectrolyte effect in the zwitterionic polymer solution. The results of dynamic laser light scattering experiment also showed that the average hydrodynamic diameters of the zwitterionic polymer molecules increased with the increasing of salt concentration. The network structures had been observed by atomic force microscope and the addition of salt strengthened the formation of network structures. The results of fluorescence experiment showed that the addition of salt could enhance the association of hyrophobically zwitterionic polymer.

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Molecular properties of poly(carboxybetaine) in solutions with different ionic strengths and pH values

Cited by 11 publications

References 17 publications

Effects of Halide Anions on the Solution Behavior of Double Hydrophilic Carboxy-Sulfobetaine Block Copolymers

Effects of Halide Anions on the Solution Behavior of Double Hydrophilic Carboxy-Sulfobetaine Block Copolymers

Structures and Synthesis of Zwitterionic Polymers

The solution behavior of hydrophobically associating zwitterionic polymer in salt water

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