Preparation and characterization of composite polyaniline/poly(vinyl alcohol)/palygorskite

Abstract

The preparation of composites occurred by insertion of organically modified molecules, using quaternary ammonium salts-Cetremide (cetyl trimethyl ammonium bromide, CTAB) and Genamim (cetyl trimethyl ammonium chloride, CTAC)-in the fibrous structure of the palygorskite clay (PALY). For the preparation of PANI/PVA (polyaniline/poly(vinyl alcohol), PANI/PVA/ PALY, PANI/PVA/PALY-CTAB, and PANI/PVA/PALY-CTAC films, the ''casting'' technique was used, and they were characterized by XRD, FTIR, SEM, TG/DTG, and DSC. The XRD and FTIR data suggest that there was the incorporation of characteristic groups of the ammonium salts was incorporated on the clay. The TG/DTG curves showed that the decomposition occurred with natural and organophilic PALY showing a thermal stability profile. The incorporation of PALY to the blend PANI/PVA affected the thermal profile, and the DSC curves of the PANI/PVA/PALY suggest that the incorporation of polymers in the PALY structure decreases the crystalline fraction of the material. Through electrical impedance spectroscopy with alternating current, we observed that the blend of composites PANI/PVA with clay PALY-CTAC is more conductive presenting electric conductivity at low frequencies around 6.0 9 10 -4 S cm -1 , whereas in the films with the clay PALY-CTAB conductivity reaches 1.4 9 10 -6 S cm -1 , that is approximately four times smaller. It was observed that films with clay and those that are doped become much more conductive than the electrical blend of PANI/PVA doped as well.

Preparation, characterization, and investigation of poly(AMPS/AM/SSS) on application performance of water‐based drilling fluid

“…Moreover, it was shown that the quality retention still can come to 53.54% when the temperature up to 400 °C. Based on above thermal decomposition analysis, it was confirmed that the poly(AMPS/AM/SSS) has excellent thermal stability …”

Facile approach to fabricate waterborne polyaniline nanocomposites with environmental benignity and high physical properties

“…Although dispersions contain colloidal particles instead of polymers, if we assume the dispersed water droplets slip past each other like the reptation motion of polymer chains the results of polymer analysis can be transferred to dispersions. It is observed that both dispersions present pseudoplastic liquid behaviour 47 . The viscosity of in situ PVA/PANI is higher at lower shear rate and then keeps decreasing with shear rate.…”

Clays as Biomaterials in Controlled Drug Release: A Scientific and Technological Short Review

“…Hydrogels composed of polymers (chitosan and polyvinyl alcohol) were developed by [52], this paper evaluated the influence of the percentage of laponite in the hydrogels, noting the presence of the clays. [58], developed a dendrimer, in the form of nanodiscs, using laponite in its structure.…”

“…The interaction between the components of the biomaterial formulation (drug, clay and other constituents) will determine the way and the rate with the drug is released from the matrix. Some parameters directly influence the controlled release process, such as the effect of solubility,effect of PH [62,63], effect of clay quantity drug effect carried and kinetic study [4,45,58].…”