Silver and palladium nanoparticle embedded poly(n-isopropylacrylamide-co-2-acrylamido-2-methylpropane sulfonic acid) hybrid microgel catalyst with pH and temperature dependent catalytic activity

Fabrication and characterization of interpenetrating network hydrogels based on sequential amine‐anhydride reaction and photopolymerization in water

“…It can be inferred that the reaction of PAH and PAM happened. [54,55] In Figure 9B(a), the peaks at1658 and 1550 cm À1 are attributed to the absorption peaks of C O and N H in amide group, and the peak at 1627 cm À1 corresponds to the characteristic peaks of C C in NIPAAm, the characteristic peaks of isopropyl in NIPAAm present at 1375 and 1369 cm À1 , [56][57][58] and in Figure 9B(b), the characteristic peaks of sulfonic group in AMPS present at 1234 and 1049 cm À1 , and the characteristic absorption peaks of C C and C O present at 1616 and 1662 cm À1 , respectively [59,60] ; In SP-Gel, the peaks at 1616 and 1627 cm À1 disappeared, the stretching vibration peak of carbonyl groups in amide presents at 1658 cm À1 , and the vibration peak of carbonyl groups in ester groups in crosslinking agent appears at 1721 cm À1 , indicating the happening of the polymerization of NIPAAm and AMPS.…”

“…[51][52][53] In the infrared spectrum of SP-Gel, the peaks at 1721 and 1658 cm À1 correspond to the stretching vibration of C O in ester group and amide group, respectively, while the peaks at 1540 and 1450 cm À1 correspond to the absorption of N H and C N in amide, respectively, [56][57][58] the characteristic peaks of sulfonic acid group located at 1238 and 1088 cm À1 . [59,60] By comparing the spectra of IPN IPN-Gel and two single networks SC-Gel and SP-Gel, we can see that the main infrared absorption peaks of single network SC-Gel and SP-Gel appear on the infrared spectrum of IPN-Gel, and the characteristic peaks of carbonyl groups in ester group and amide group are located at 1724 and 1662 cm À1 , respectively, and the characteristic peaks of sulfonyl group shift to 1248 and 1064 cm À1 , indicating that IPN-Gel is not a simple physical mixing of two signal networks.…”

Functionalization of polymers and nanomaterials for water treatment, food packaging, textile and biomedical applications: a review

“…Other forms of materials bearing sulfonic groups studied include gels. Haleem et al (2020) reported the poly(n-isopropylacrylamide-co-2-acrylamido-2-methylpropane sulfonic acid) hybrid gel embedding Ag and Pd nanoparticles, used as a catalyst for degradation of P-nitrophenol and Rhodamine-B. Hydrosoluble polymers bearing sulfonic acid groups were not investigated frequently.…”

Effect of Methacrylic Acid in PNNPAM Microgels on the Catalytic Activity of Embedded Palladium Nanoparticles

“…[47] In particular, the quantification of metal surface area and the normalization of the reaction rate constant to this area have been performed in only a few studies. [48][49][50] In order to address this point in more detail, we prepared a variety of N-n-propylacrylamide (NNPAM) based microgel systems with nominal methacrylic acid (MAc) feeds between 5 and 25 mol%. The incorporation of MAc and its influence on the thermoresponsive properties of the microgels were followed by means of potentiometric titration and photon correlation spectroscopy (PCS).…”