Large-scale synthesis and characterization of magnetic poly(acrylic acid) nanogels via miniemulsion polymerization

Abstract

This article provides a facile method for the large-scale preparation of magnetic poly(acrylic acid) (PAA) nanogels. Cross-linked polyacrylonitrile (PAN) nanoparticles were synthesized via a miniemulsion polymerization method using acrylonitrile (AN) and divinyl benzene (DVB) as the raw materials, and then PAA nanogels were obtained from the cross-linked PAN nanoparticles under basic conditions. The structure and morphologies of PAN nanoparticles, PAA nanogels, and magnetic PAA nanogels were characterized by Fourier-transformed infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and dynamic light scattering equipment (DLS), respectively. The pH-responsive property of PAA nanogels was investigated by measuring their swelling-deswelling behavior under different pH buffer solutions. The results showed that the obtained PAN nanoparticles were of uniform spherical morphology with a wrinkled surface and had a narrow size distribution with an average size of 105 nm in diameter. PAA nanogels were regular spherical particles with an average particle size of 230 nm in diameter. The PAA nanogels demonstrated excellent pH-responsive properties in different pH buffer solutions. After the addition of g-(trimethoxysilyl)propyl methacrylate (MPS) modified magnetic nanoparticles, magnetic PAA microgels were fabricated successfully.

A Highly Efficient Ag Nanoparticle-Immobilized Alginate-g-Polyacrylonitrile Hybrid Photocatalyst for the Degradation of Nitrophenols

“…The FTIR spectrum of the Alg@Ag NPs ( Figure 1 b) contains a peak at 575 cm −1 that corresponds to the Ag–O coordination bond, whereas the peak at 3430 cm −1 is due to –OH stretching and C=O bond stretching is evident in the peak at 1644 cm −1 [ 31 ]. The spectrum of PAN ( Figure 1 c) exhibits a wide sharp peak at 3450 cm −1 that is attributed to –OH groups due to humidity; the peak at 2246 cm −1 confirms the presence of nitrile groups (–C=N); peaks are noted at 1449–1624 cm −1 (–CH and –CH 2 vibrations), 1061 cm −1 (–C–CN bond stretching), and 2926 cm −1 (stretching vibration of the –CH 2 group of the PAN chain) [ 32 ]. The spectrum of PAN-g-Alg@Ag NC ( Figure 1 d) contains peaks at 3353 cm −1 (both –OH and –NH stretching) and 1634 cm −1 (–C=O bond).…”

Modified Poly(acrylic acid)-Based Hydrogels for Enhanced Mainstream Removal of Ammonium from Domestic Wastewater

“…To reduce the particle size and increase the surface area of the hydrogels during sorption, selected NaPAA hydrogels that achieved the desired swelling and adsorption performance were synthesized using inverse suspension polymerization. This polymerization method produces uniform-sized hydrogel microparticles with a size range of 1 μm to 1 mm depending on the polymerization conditions, thus eliminating the need for post-synthesis milling and/or crushing. , The monomer solution (50 mL) was prepared by dissolving AA, MBA, NaOH, and APS (please refer to Table for the composition) in distilled water at room temperature and was stirred in a glass beaker for 30 min until homogenous. In a dry three-necked round-bottomed flask fitted with a nitrogen gas inlet, dropping funnel, and a thermocouple, the organic phase, consisting of 250 mL Hexane and 0.9 g Span 60, was slowly heated to 60 °C and stirred at 250 rpm under a nitrogen atmosphere.…”

Synthesis, Morphologies and Building Applications of Nanostructured Polymers

“…The resulting modified PAN-NPs could be used for the sensitive and selective detection of free copper ions. Zhang, J. et al prepared cross-linked PAN-NPs via miniemulsion polymerization [ 66 ]. The corresponding poly(acrylic acid) (PAA) nanogels could then be obtained under basic conditions.…”