Effect of anions on the phase transition temperature of two structurally isomeric polymers: poly(<i>N</i>-isopropylacrylamide) and poly(2-isopropyl-2-oxazoline)

Chung, Taehun; Han, Jihoon; Kim, Young Jae; Jeong, Kyeong-Jun; Koo, Jun Mo; Lee, Jemin; Park, Hyung Gyu; Joo, Taiha; Kim, Youn Soo

doi:10.1039/d2py00543c

Polym. Chem.

2022

DOI: 10.1039/d2py00543c

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Effect of anions on the phase transition temperature of two structurally isomeric polymers: poly(N-isopropylacrylamide) and poly(2-isopropyl-2-oxazoline)

Taehun Chung,

Jihoon Han,

Young Jae Kim

et al.

Abstract: The effect of Hofmeister anions on the lower critical solution temperature (LCST) of two structural isomers, namely, poly(N-isopropylacrylamide) (PNIPAAm) and poly(2-isopropyl-2-oxazoline) (PiPOx), is studied. Following the preparation of these two...

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Cited by 5 publications

References 59 publications

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Promoting Homogeneous Zinc‐Ion Transfer Through Preferential Ion Coordination Effect in Gel Electrolyte for Stable Zinc Metal Batteries

Lee,

Han,

Jeon

et al. 2023

Advanced Science

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Aqueous zinc metal batteries (AZMBs) are emerging energy storage systems that are poised to replace conventional lithium‐ion batteries owing to their intrinsic safety, facile manufacturing process, economic benefits, and superior ionic conductivity. However, the issues of inferior anode reversibility and dendritic plating during operation remain challenging for the practical use of AZMBs. Herein, a gel electrolyte based on zwitterionic poly(sulfobetaine methacrylate) (poly(SBMA)) dissolved with different concentrations of ZnSO4 is proposed. Two‐dimensional correlation spectroscopy based on Raman analysis reveals an enhanced interaction priority between the polar groups in SBMA and the dissolved ions as electrolyte concentration increases, which establishes a robust interaction and renders homogeneous ion distribution. Attributable to the modified coordination, zwitterionic gel polymer electrolyte with 5 mol kg−1 of ZnSO4 (ZGPE‐5) facilitates stable zinc deposition and improves anode reversibility. By taking advantage of preferential coordination, a symmetrical cell evaluation employing ZGPE‐5 demonstrates a cycle life over 3600 h, where ZGPE‐5 also exerts a beneficial effect on the full cell cycling when assembled with Zn0.25V2O5 cathode. This study elucidates changes in the internal ion behavior that are dependent on electrolyte concentrations and pave the way for durable AZMBs.

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Promoting Homogeneous Zinc‐Ion Transfer Through Preferential Ion Coordination Effect in Gel Electrolyte for Stable Zinc Metal Batteries

Lee,

Han,

Jeon

et al. 2023

Advanced Science

Self Cite

View full text Add to dashboard Cite

show abstract

Double layered asymmetrical hydrogels enhanced by thermosensitive microgels for high-performance mechanosensors and actuators

Wu,

Zhou,

Gao

et al. 2024

Journal of Colloid and Interface Science

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Thionation of Poly(2-ethyl-2-oxazoline) and Its Effect on Solubility and Cloud Point

Hacioglu,

Baddam,

Kerr

et al. 2024

Macromolecules

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Many water-soluble polymers undergo phase separation above their lower critical solution temperature (LCST) in aqueous solutions. Generally, the LCST is controlled via the polymer−solvent interactions, which, in turn, are highly structure dependent and typically tuned via the polymer side chain. For example, the LCST for the poly(2-oxazoline) family can be tuned via the length and branching of the polymer side chain. In particular, the LCST of poly(2-ethyl-2-oxazoline) varies between 60 and 100 °C, depending on its molar mass, polymer architecture, and concentration. Here, we introduce LCST adjustment via modification of the carbonyl of the amide moiety of poly(2oxazoline)s. We introduce poly(2-ethyl-2-oxazoline-co-N-propiothioacetyl ethylene imine), synthesized from poly(2-ethyl-2oxazoline) using Lawesson's reagent. The degree of thionation of the polymers was varied and characterized by using spectroscopic methods and elemental analysis. While the glass transition temperatures of the copolymers increase with increasing thionation degrees, the decomposition temperatures decrease. Interestingly, polymers with less than 20% thionation degree were soluble in water with LCST behavior. The cloud point temperatures decrease with increasing thionation degree due to the weaker hydrogen bonding ability of thioamides and decreased polarity.

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Effect of anions on the phase transition temperature of two structurally isomeric polymers: poly(N-isopropylacrylamide) and poly(2-isopropyl-2-oxazoline)

Abstract: The effect of Hofmeister anions on the lower critical solution temperature (LCST) of two structural isomers, namely, poly(N-isopropylacrylamide) (PNIPAAm) and poly(2-isopropyl-2-oxazoline) (PiPOx), is studied. Following the preparation of these two...

Cited by 5 publications

References 59 publications

Promoting Homogeneous Zinc‐Ion Transfer Through Preferential Ion Coordination Effect in Gel Electrolyte for Stable Zinc Metal Batteries

Promoting Homogeneous Zinc‐Ion Transfer Through Preferential Ion Coordination Effect in Gel Electrolyte for Stable Zinc Metal Batteries

Double layered asymmetrical hydrogels enhanced by thermosensitive microgels for high-performance mechanosensors and actuators

Thionation of Poly(2-ethyl-2-oxazoline) and Its Effect on Solubility and Cloud Point

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