Upper critical solution temperature (UCST) phase transition of halide salts of branched polyethylenimine and methylated branched polyethylenimine in aqueous solutions

Noh, Minwoo; Kang, Seok Jin; Mok, Yeongbong; Choi, So Jung; Park, Jeong-Seon; Kingma, Jannick; Seo, Ji Hun; Lee, Yan

doi:10.1039/c5cc08005c

Cited by 28 publications

(18 citation statements)

References 23 publications

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“…HBr and HI are more efficient in inducing a cloud point than HCl. When PEI is functionalized with 35 to 38% permanent Poly(triphenyl-4-4vinylbenzyl phosphonium chloride) 44 and polyethyleneimine 45 (top) exhibit UCST behavior in the presence of various halide anions (below, presented with their respective effective radii).…”

Section: Halogen Anionsmentioning

confidence: 99%

“…47 Tetrafluoroborate can also turn PEI thermoresponsive, as is reported by Noh et al in their studies with partially quaternized PEI. 45 Cinnamic acid is another hydrophobic ion that can induce UCST behavior in PEI. The cloud point could be controlled in pH 7.0 buffer by varying the ratio of cinnamic acid to the amino groups in the polymer.…”

Section: Hydrophobic Counterionsmentioning

confidence: 99%

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How to manipulate the upper critical solution temperature (UCST)?

2017

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Section: Halogen Anionsmentioning

confidence: 99%

Section: Hydrophobic Counterionsmentioning

confidence: 99%

How to manipulate the upper critical solution temperature (UCST)?

2017

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“…UCST behavior of fully charged polyelectrolytes [22] is obtained by adding specific counterions, e.g. hydrophobic [23][24][25] or multivalent [26,27] ions or for poly(ionic liquids) [28] with chloride counterions.…”

Section: Introductionmentioning

confidence: 99%

Unexpected aqueous UCST behavior of a cationic comb polymer with pentaarginine side chains

Zydziak

Iqbal

Chaumont

et al. 2020

European Polymer Journal

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Thermoresponsive polymers, undergoing a reversible chemical or physical change using temperature as stimulus, attract increasing interest in particular as adaptable biomaterials. Except for zwitterionic polymers, fully charged polymers require the presence of specific ions to exhibit an upper critical solution temperature (UCST) in water. Herein, we report the discovery of an UCST in pure water for fully cationic comb polymers based on oligoarginine pendent grafts. These polymers were prepared using an original strategy based on solid-phase peptide synthesis of pentaarginine methacrylate-based macromonomer and its polymerization through reversible addition-fragmentation chain transfer. Despite their cationic nature, guanidinium groups from the arginine have the ability to self-associate at low temperature through hydrophobic interactions into stacked pair configuration defying the expected Coulomb interactions. These results pave the way to biomedical applications such as antimicrobial materials and drug delivery systems through the tuning of the polymer structure.

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“…In contrast, studies related to the polymers showing UCST type transitions in water are quite limited but increasing in the last years. Although, some of the zwitterionic polymers and polyelectrolytes show UCST‐type transitions in water, they are dominated by Coulomb interactions and the thermoresponsive behavior is highly dependent upon the molar mass, presence of salts, ionic strength and multivalent ions . In the last few years more and more attention has been given to the nonionic polymers with phase transitions dominated by hydrogen (H)‐bonding .…”

Section: Introductionmentioning

confidence: 99%

Tunable, concentration‐independent, sharp, hysteresis‐free UCST phase transition from poly(N‐acryloyl glycinamide‐acrylonitrile) system

Käfer

Lerch

Agarwal

2016

J. Polym. Sci. Part A: Polym. Chem.

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Poly(N‐acryloylglycinamide‐co‐acrylonitrile) (poly(NAGA‐AN)) copolymers were synthesized using reversible‐addition‐fragmentation transfer polymerization. In contrast to poly(NAGA) the thermoresponsive behavior of poly(NAGA‐AN) shows a narrow cooling/heating hysteresis in water with a tunable cloud point, depending on the acrylonitrile amount in polymer. Furthermore, we showed that there is no significant effect of the solution concentration on the cloud point and stable phase transition behavior in electrolyte solutions, which is presumable controlled by forming stable micellar like structures as a result of the block/graft‐copolymer structure. This is in contrast to poly(NAGA) which shows a strong concentration dependent cloud point in aqueous solution with a broad cooling/heating hysteresis. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017, 55, 274–279

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Upper critical solution temperature (UCST) phase transition of halide salts of branched polyethylenimine and methylated branched polyethylenimine in aqueous solutions

Cited by 28 publications

References 23 publications

How to manipulate the upper critical solution temperature (UCST)?

How to manipulate the upper critical solution temperature (UCST)?

Unexpected aqueous UCST behavior of a cationic comb polymer with pentaarginine side chains

Tunable, concentration‐independent, sharp, hysteresis‐free UCST phase transition from poly(N‐acryloyl glycinamide‐acrylonitrile) system

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