Wang, F.; Cheng, T.; Zhou, G. Thermoplastic Polyurethane-Poly(N-Isopropylacrylamide) Composite for Selective Adsorption Separation of Mixed Alcohol/Water Solutions. Preprints2024, 2024030343. https://doi.org/10.20944/preprints202403.0343.v1
APA Style
Wang, F., Cheng, T., & Zhou, G. (2024). Thermoplastic Polyurethane-Poly(N-Isopropylacrylamide) Composite for Selective Adsorption Separation of Mixed Alcohol/Water Solutions. Preprints. https://doi.org/10.20944/preprints202403.0343.v1
Chicago/Turabian Style
Wang, F., Tiexin Cheng and Guangdong Zhou. 2024 "Thermoplastic Polyurethane-Poly(N-Isopropylacrylamide) Composite for Selective Adsorption Separation of Mixed Alcohol/Water Solutions" Preprints. https://doi.org/10.20944/preprints202403.0343.v1
Abstract
The present study describes the preparation of a composite material consisting of thermoplastic polyurethane-poly (n-isopropylacrylamide) (TPU-PNIPAM), which was employed for the se-lective adsorption separation of alcohol/water mixed solutions for the first time. The findings revealed that TPU and PNIPAM were interconnected through interchain hydrogen bonding, resulting in exposed hydrophobic isopropyl groups while covering the hydrophilic hydrogen bond sites. Selective separation of alcohols from alcohol/water mixed solutions occurred via London dispersion forces between alkyl groups. Increasing the PNIPAM load on the TPU surface led to a decrease in available hydrogen bond sites capable of bonding with water molecules, an increase in dispersible isopropyl groups interacting with alcohol alkyl groups, and enhanced selective adsorption capacity of TPU-PNIPAM towards alcohol/water mixed solutions. Moreover, TPU-PNIPAM exhibited a characteristic fast-slow-fast-equilibrium ad-sorption curve for different initial concentrations of alcohol/water mixtures, and its selective adsorption capacity increased when temperature reached 55℃. In addition to these general trends, under identical conditions, the selective adsorption capacity of TPU-PNIPAM gradually increased by methanol < ethanol < isopropyl alcohol < propyl alcohol, thus indicating a positive correlation between selectivity performance and hydrophobicity level.
Chemistry and Materials Science, Physical Chemistry
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