Tuning the pH‐responsiveness capability of poly(acrylic acid‐co‐itaconic acid)/NaOH hydrogel: Design, swelling, and rust removal evaluation

Abstract

The swelling behavior of poly(acrylic acid‐co‐itaconic acid)/NaOH hydrogel as well as its ability for iron and copper rust removal was studied and established for the first time. Through an experimental design, the influence of the synthesis parameters on hydrogel response was determined. It was found that pH‐responsiveness dependence of hydrogel determines its application. In alkaline media, the hydrogel acted as superabsorbent, while in acidic, the most outstanding property was its pickling capability that allowed to clean carbon steel and copper metallic surfaces. Infrared, thermogravimetry, and scanning electron microscopy were performed to determine copolymer formation, thermal properties, and morphology. Metallic crystallographic phases formed during the corrosion processes were determined by X‐ray diffractometer. Hydrogel adhesiveness followed by diffusion and dissolution of metal oxides species was identified as the main steps in the rust removal mechanism. This method offers a new, environmentally friendly perspective to eliminate corrosion from metallic surfaces compared with traditional strategies. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48403.

Synthesis of Bamboo-like Multiwall Carbon Nanotube–Poly(Acrylic Acid-co-Itaconic Acid)/NaOH Composite Hydrogel and its Potential Application for Electrochemical Detection of Cadmium(II)

“…A solution mixture of acrylic acid (80 wt %) and itaconic acid (20 wt %) monomers in deionized water was prepared in a total monomer concentration at 24 wt %. The amount of initiator and crosslinker were 0.4% and 0.2% in weight, which was optimized previously [ 33 ], regarding the monomers, respectively. NaOH (7.5 wt % in respect to the monomers) was added at beginning of the reaction to assure the dissociation of the carboxylic groups.…”

“…The hydrogel percentage of water absorption ( Q ) was calculated following Equation (1). where A and B are the weights of the dry polymer (g) and the swollen polymer (g), respectively [ 33 ].…”

Highly Stretchable, Strain-Sensitive, and Ionic-Conductive Cellulose-Based Hydrogels for Wearable Sensors

“…To identify and contrast the interactions between allyl cellulose, CHs, and acrylic acid, ATR-FTIR spectroscopy was performed (Figure 2A). The peaks at 1633 and 1570 cm −1 were attributed to C=C stretching [30,31]. The characteristic peaks at 1718 cm −1 correspond to the C=O bond of COOH [31,32].…”

“…Polymers 2019, 11, 2067 4 of 10 [31,32]. Additionally, the peaks at 1560 cm −1 are related to the stretching of COOgroups ascribed to the deprotonation of carboxylic acid groups under alkaline conditions [31]. Allyl cellulose was successfully synthesized as indicated by the appearance of C=C stretching at 1570 cm −1 .…”

Ammonium nitrogen adsorption from aqueous solution by poly(sodium acrylate)s: Effect on the amount of crosslinker and initiator

“…The replacement of poly(acrylic acid) (PAA) with PANa as the adsorbent is caused by the strong electrostatic interaction of PANa with positive charged molecules. [42] There are two methods to prepare PANa polymer, (a) prepared PAA first then neutralized through NaOH aqueous solution to obtain PANa and (b) neutralized AA monomer at initiated stage and then polymerized ( Figure 1). The latter method was selected in this study for better carboxylate anion ratios that able to adsorb more cationic species.…”