Synthesis and characterization of polyacrylamide‐calcium carbonate and polyacrylamide‐calcium sulfate nanocomposites

Abstract

Polyacrylamide‐calcium carbonate (PAM/CaCO3) and polyacrylamide‐calcium sulfate (PAM/CaSO4) nanocomposites were prepared via solution‐mixing technique. The resulting PAM‐based nanocomposites with various CaCO3 and CaSO4 nanoparticles contents (0–4% w/w) were investigated. Nanoparticles of CaCO3 and CaSO4 were synthesized by in situ deposition technique. In this technique, the surface modification of nanoparticles was performed by nonionic polymeric surfactant. The particle size of nanoparticles was recognized by X‐ray diffraction and scanning electron microscope (SEM) analysis which confirms that the particle has diameter of 25–33 nm. As prepared, nanocomposites films (thickness, 40‐μm) were characterized by Fourier transform infrared (FT‐IR), SEM, and energy‐dispersive X‐ray spectroscopy (EDS). FT‐IR shows the chemical structure of nanocomposites where as SEM analysis suggested that the nanofillers dispersed well in polymer matrix and EDS shows the elemental composition of the nanocomposite samples. Thermal properties of the nanocomposites were studied by using differential scanning calorimetric analysis. The PAM/CaCO3 and PAM/CaSO4 nanocomposites showed a higher glass transition temperature and a better thermal stability compared to the pure PAM. The glass transition temperature (Tg) of nanocomposites increases with increase in content of nanoparticles. It may be owing to the interaction between inorganic and organic components. POLYM. COMPOS.,, 2012. © 2012 Society of Plastics Engineers

Reinforcing hydrogels with in situ formed amorphous CaCO3

“…These changes in the FTIR spectra imply that the formed CaCO 3 crystals chemically interact with the PAM hydrogel. 44,45 Particles that interact with hydrogels are firmly connected to them and often act as multivalent crosslinking points. 42,46 To test if this is also the case for our composite, we visualize the CaCO 3 crystal-matrix interfaces with SEM.…”

Effect of Cationic and Anionic Surfactants on the Application of Calcium Carbonate Nanoparticles in Paper Coating

“…A wide variety of water-soluble additives has been successfully used for modifying calcium carbonate. Water-soluble organic additives, cationic, , anionic, − and non-ionic − or their mixtures, − were usually used during preparation to control the size, morphology, hydrophobicity, and dispersion stability of the produced calcium carbonate. Inorganic additives such as phosphoric acid, sodium hexametaphosphate, sodium silicate, and fluorosilicic acid can be used to improve the acid-tolerance properties of calcium carbonate.…”

Preparation and Characterization of PAM‐b‐DOPOAA by ATRP

“…The thermal degradation behavior of PAMÀ Br and the block copolymer (PAM-b-DOPOAA) in a nitrogen atmosphere was studied. [19] The glass transition temperature Tg of PAMÀ Br can be observed to be 111.1 °C, [20] while two glass transition temperatures, 102.9 °C and 189.7 °C, can be observed in the DSC images of PAM-b-DOPOAA. The glass transition temperature of the polyacrylamide chain seg-…”