Salt-dependent surface activity and micellization behaviour of zwitterionic amphiphilic diblock copolymers having carboxybetaine

Murugaboopathy, Sivanantham; Matsuoka, Hideki

doi:10.1007/s00396-015-3503-1

Cited by 15 publications

(11 citation statements)

References 35 publications

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“…Synthesis conditions of polymers and specifications are summarized in Table . The polymerization was performed at a reduced temperature (45 °C) with VA-044 to minimize possible hydrolysis of the CTA in aqueous condition, which deactivates controlled polymerization. , The homo-PGLBT synthesis gave similar results to previous examples carried out at 70 °C. , At the second step, SPEs were not polymerized under the same reaction condition and feed ratio, while the polymerizations of homo-SPEs and random copolymer PGLBT- r -PSPEs were carried out well under the identical operation condition. In our experiment, a larger amount of the initiator was required to start the second polymerization with PGLBT macroCTAs.…”

Section: Resultsmentioning

confidence: 73%

“…According to previous reports, , PGLBT does not respond to temperature unlike UCST-type PSPE and other sulfobetaine species; it remains in a dissolved state in spite of having zwitterions. Comparing the transmittance change with that of homo-PSPE having a similar extent of repeating unit (Figure ), it is evident that the PGLBT segment affects the hydrophobic collapse of PSPE segments.…”

Section: Resultsmentioning

confidence: 82%

“…For applications, polymer gels copolymerized with 2-hydroxyethyl methacrylate (HEMA) were obtained because of their superior resistance of protein adsorption compared with nonionic or even polysulfobetaines. In our previous research, several kinds of polycarboxybetaine (PGLBT) derivatives amphiphilic block copolymer was synthesized, and we investigated their responses to pH or added salts when they formed micelles in aqueous solution or monolayers on the air–water surface. , The surface activity and micelle formation of carboxybetaine-based amphiphilic copolymers were observed by light scattering and X-ray reflectivity. Both showed chain stretching of the polycarboxybetaine chains by salt addition, unlike cationic or anionic polyelectrolytes.…”

Section: Introductionmentioning

confidence: 99%

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Temperature-Responsive Behavior of Double Hydrophilic Carboxy-Sulfobetaine Block Copolymers and Their Self-Assemblies in Water

et al. 2018

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The block copolymer poly(2-((2-(methacryloyloxy)ethyl)dimethylammonio)acetate)-b-poly(3-(N-(2-metharyloylethyl)-N,N-dimethylammonio)propanesulfonate) (PGLBT-b-PSPE) was synthesized by reversible addition–fragmentation chain transfer (RAFT) technique under precise control. The PGLBT-b-PSPE block copolymers showed upper critical solution temperature (UCST) behavior originating from PSPE moieties. Unlike PSPE homopolymers, the transmittance change with temperature was gradual, and unexpected retardation or slight changes in a reverse direction were found at the intermediate stage. Light scattering and 1H NMR studies proved that the block copolymers formed spherical micelles that were composed of a PSPE core and PGLBT shell around room temperature and lower temperatures, and slowly disassociated with temperature increase. During the transition, fast (small particle) and slow (large particle) diffusive modes were detected by dynamic light scattering (DLS), which implied that the unimers were escaping from the self-assembled structure and swollen micelles, respectively. At sufficiently high temperatures where the solutions became almost transparent, the slow mode eventually disappeared, and only the fast mode remained. In addition, once the polymeric particles are formed, the size did not vary much with additional cooling. The transition point and the pattern of transmittance alteration were dependent on the degree of polymerization and the [PGLBT]:[PSPE] ratios; more PGLBT made the block copolymer less responsive to temperature and led the cloud point to lower degrees. However, random copolymers PGLBT-r-PSPE did not show any temperature-responsivity, and even small amount of GLBTs (10%) distributed in a PSPE chain significantly suppressed the transition.

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Section: Resultsmentioning

confidence: 73%

Section: Resultsmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

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Temperature-Responsive Behavior of Double Hydrophilic Carboxy-Sulfobetaine Block Copolymers and Their Self-Assemblies in Water

et al. 2018

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“…Betaine polymeric surfactant is a new type of polymeric surfactant that was developed based on ionic polymeric surfactant [23][24][25][26][27]. The introduction of betaine-type ionic groups into the comonomer allows the aqueous solution to produce a reverse polyelectrolyte effect.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influencing Factors of the Emulsion Stability of a Polymeric Surfactant Based on a New Emulsification Device

et al. 2020

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Polymeric surfactant flooding is an effective method to improve oil recovery, and the stability of the emulsion is closely related to the effect of surfactant flooding. The preparation method for a surfactant-stabilized emulsion is relatively simple, and the emulsion produced by the existing device cannot simulate the real formation conditions. To better simulate the emulsification of polymeric surfactant during formation and to study the influencing factors of emulsion stability, a new sieve plate rotary emulsification device was used to prepare emulsions instead of the traditional high-speed shear emulsifier, and the stability of emulsions prepared by different methods was compared. The parameters of the device were optimized by determining the water content, particle size, and Turbiscan Stability Index TSI (stability parameter) of the emulsion. The factors affecting the stability of the emulsion were studied by using the optimized experimental device. The results showed that the optimized parameters of the sieve plate rotary emulsification device were 5 sieve plates, diameter of 1 mm, and emulsification time of 60 min. The stability of the emulsion prepared by the new device was better than that of the emulsion prepared by the traditional high-speed stirrer, which can be attributed to the more abundant contact and mix of oil and surfactant solution. Meanwhile, as the polymeric surfactant concentration, salinity, and water–oil ratio increased, the stability of the polymeric surfactant emulsion increased. The results of this study provide a theoretical basis and guidance for better simulation of polymeric surfactant migration and emulsification during formation.

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“…The betaine polymer, which is a type of zwitterionic polymer having both an anion and a cation, is an interesting polymer, unlike ordinary ionic polymers, because of unique characteristics such as polymer chain extension by salt addition. − The viscosity of the polymer aqueous solution increased by the addition of salt, and its extent depends on the ion species. Different behavior from conventional ionic polymers is named the “anti-polyelectrolyte effect”. − …”

Section: Introductionmentioning

confidence: 99%

Synthesis and Stimuli Responsivity of Diblock Copolymers Composed of Sulfobetaine and Ionic Blocks: Influence of the Block Ratio

2018

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Ionic diblock copolymers having sulfobetaine, poly(sodium styrenesulfonate)-b-poly(sulfopropyl dimethylammonium propylacrylamide) (PSSNa-b-PSPP), and poly[3-(methacrylamido)propyl trimethylammonium chloride])-bpoly(sulfobetaine) (PMAPTAC-b-PSPP) were synthesized by reversible addition−fragmentation chain transfer (RAFT) polymerization. Polysulfobetaine has the temperature responsivity of the upper critical solution temperature (UCST) type.However, sulfobetaine/PSSNa and sulfobetaine/PMAPTAC with block ratios of 1:1.8 (36-b-66) and 1:1.3 (50-b-66), respectively, did not show any temperature responsivity. This is probably due to the interaction between sulfobetaine and ionic polymer (anionic or cationic) to form some complex. Therefore, we investigated the effect of the block ratio on the temperature response and interaction between sulfobetaine and ionic polymers. The UCST behavior of the block copolymer composed of a sulfobetaine chain and ionic chain was investigated by changing the block ratio by turbidimetry. PSSNa-b-PSPP and PMAPTAC-b-PSPP with block ratios of 1:42.5 (6:255) and 1:4 (16:61), respectively, showed temperature responsivity. The expression of temperature responsivity was found to be very sensitive to the chain length of the ionic chain block. The temperature responsivity was considered to disappear because of the interaction between the sulfobetaine chain and the ionic chain. The interaction was investigated by adding the ionic polymer to the sulfobetaine homopolymer. UCST behavior was confirmed by adding 0.1% PSSNa and 1% PMAPTAC, respectively. The results suggested that the sulfobetaine chain and the ionic chain interacted with each other and that PSSNa was more sensitive than PMAPTAC. In addition, it was confirmed by a 1 H NMR measurement that the sulfobetaine chain and ionic chain in the homopolymer mixture system and a block copolymer interact with each other.

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Salt-dependent surface activity and micellization behaviour of zwitterionic amphiphilic diblock copolymers having carboxybetaine

Cited by 15 publications

References 35 publications

Temperature-Responsive Behavior of Double Hydrophilic Carboxy-Sulfobetaine Block Copolymers and Their Self-Assemblies in Water

Temperature-Responsive Behavior of Double Hydrophilic Carboxy-Sulfobetaine Block Copolymers and Their Self-Assemblies in Water

Study on the Influencing Factors of the Emulsion Stability of a Polymeric Surfactant Based on a New Emulsification Device

Synthesis and Stimuli Responsivity of Diblock Copolymers Composed of Sulfobetaine and Ionic Blocks: Influence of the Block Ratio

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