Working Paper Article Version 1 This version is not peer-reviewed

Hydrogen Bonds in Blends of Poly(N-Isopropylacrylamide), Poly(N-Ethylacrylamide) Homopolymers, and Carboxymethyl Cellulose

Version 1 : Received: 10 August 2021 / Approved: 11 August 2021 / Online: 11 August 2021 (10:46:47 CEST)

A peer-reviewed article of this Preprint also exists.

García-Peñas, A.; Liang, W.; Hashmi, S.; Sharma, G.; Saeb, M.R.; Stadler, F.J. Hydrogen Bonds in Blends of Poly(N-isopropylacrylamide), Poly(N-ethylacrylamide) Homopolymers, and Carboxymethyl Cellulose. J. Compos. Sci. 2021, 5, 240. García-Peñas, A.; Liang, W.; Hashmi, S.; Sharma, G.; Saeb, M.R.; Stadler, F.J. Hydrogen Bonds in Blends of Poly(N-isopropylacrylamide), Poly(N-ethylacrylamide) Homopolymers, and Carboxymethyl Cellulose. J. Compos. Sci. 2021, 5, 240.

Journal reference: J. Compos. Sci. 2021, 5, 240
DOI: 10.3390/jcs5090240

Abstract

Recently, it was reported that the physical cross-linking exhibited by some biopolymers could provide multiple benefits to biomedical applications. In particular, grafting thermoresponsive polymers onto biopolymers may enhance the degradability or offer other features, as ther-mothickening behavior. Thus, different interactions will affect the different hydrogen bonds and interactions from the physical cross-linking of CMC, the lower critical solution temperatures (LCSTs), and the presence of the ions. This work focuses on the study of blends composed of poly(N-isopropylacrylamide), poly(N-ethylacrylamide), and carboxymethyl cellulose in water and water/methanol. The molecular features, the thermoresponsive behavior, and gelation phenomena are deeply studied. The ratio defined by both homopolymers will alter the final properties and the gelation of the final structures, showing that the presence of the hydrophilic groups modifies the number and contributions of the diverse hydrogen bonds.

Keywords

Physical cross-linking; lower critical solution temperature; cononsolvency phenomenon; hydrogen bonds.

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