Dynamics and Rheological Behavior of Chitosan-Grafted-Polyacrylamide in Aqueous Solution Upon Heating

Overview

Journal Polymers (Basel)

Publisher MDPI

Date 2020 Apr 25

PMID 32326596

Citations 1

Authors

Mengjie Wang

Yonggang Shangguan

Qiang Zheng

Affiliations

Soon will be listed here.

Abstract

In this work, the transformation of chitosan-grafted-polyacrylamide (GPAM) aggregates in aqueous solution upon heating was explored by cryo-electron microscope (cryo-TEM) and dynamic light scattering (DLS), and larger aggregates were formed in GPAM aqueous solution upon heating, which were responsible for the thermo-thickening behavior of GPAM aqueous solution during the heating process. The heating initiates a transformation from H-bonding aggregates to a large-sized cluster formed by self-assembled hydrophobic chitosan backbones. The acetic acid (HAc) concentration has a significant effect on the thermo-thickening behavior of GPAM aqueous solution; there is a critical value of the concentration (>0.005 M) for the thermo-thickening of 10 mg/mL GPAM solution. The concentration of HAc will affect the protonation degree of GPAM, and affect the strength of the electrostatic repulsion between GPAM molecular segments, which will have a significant effect on the state of the aggregates in solution. Other factors that have an influence on the thermo-thickening behavior of GPAM aqueous solution upon heating were investigated and discussed in detail, including the heating rate and shear rate.

Citing Articles

Theoretical and Experimental Aspects of Sodium Diclofenac Salt Release from Chitosan-Based Hydrogels and Possible Applications.

Himiniuc L, Socolov R, Nica I, Agop M, Volovat C, Ochiuz L Gels. 2023; 9(5).

PMID: 37233013 PMC: 10218168. DOI: 10.3390/gels9050422.

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