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Developing tough terpolymer hydrogel with outstanding swelling ability by hydrophobic association cross-linking
, Article Polymer ; Volume 254 , 2022 ; 00323861 (ISSN) ; Shojaei, A ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Hydrogels with remarkable hydrophilicity and tunable toughness are appealing materials to serve as superabsorbent polymers. However, chemically cross-linked hydrogels often suffer from low toughness regardless of their considerable swelling, restricting their widespread applications. In comparison, the network of physically cross-linked hydrogels can be regulated to meet both a high swelling ratio and considerable toughness. Here, we develop superabsorbent and tough hydrophobic associated hydrogels using terpolymerization of poly acrylic acid (PAA), polyacrylamide (PAM), and lauryl methacrylate (LMA) within the micelles formed by sodium dodecyl sulfate (SDS) surfactant. To this end, various...
Fabrication of Stretchable, Skin-like and Conductive Hydrogel Based on Cellulose Nanocrystal As a Strain Sensor Monitoring Human Motions
, Ph.D. Dissertation Sharif University of Technology ; Shojaei, Akbar (Supervisor)
Abstract
Hydrogels are of growing interest for fabrication of wearable strain sensors due to their intrinsic ionic conductivity, flexibility, and biocompatibility. Herein, to improve the mechanical properties of hydrogels, conventional covalent crosslinking is replaced with novel physical cross-linking. First, the microstructure and properties of pure hydrogel is optimized. Then, Cellulose nanocrystal (CNC) is added to the optimized gel to reinforce it. Finally, through a sequential strategy, aniline monomers are diffused into the gel network and are in-situ polymerized accordingly, providing high conductivity of 21.7 S/m. The resulting hydrogel has the stretchability of 2500% and the toughness of...
Preparation of Acrylamide Copolymers Containing Highly Hydrophobic Monomers and Study on Their Drag Reduction Properties
, M.Sc. Thesis Sharif University of Technology ; Ramazani Saadatabadi, Ahmad (Supervisor)
Abstract
With the rapid increase of energy consumption, energy problem has been a global issue, which must be faced with and solved. One way to prevent energy consumption is to reduce drag in the flow inside the pipes by using polymer additives; Because the Transportation of liquids using pipeline technology has its limitations, since turbulent flow inside the pipe involves a loss of energy. The net effect of this is that increasing the energy applied to the flow does not increase the flow rate. For this purpose, copolymers and terpolymers of hydrophilic acrylamide monomers along with hydrophobic styrene and hydrophilic maleic anhydride monomers were synthesized by reverse emulsion polymerization...