Preparation, characterization, and properties of polyacrylonitrile–silica gel anion exchange composite fibers

Abstract

This article reports the preparation of new anion exchange composite fibers (AECFs). These AECFs were prepared by simple stirring of polyacrylonitrile (PAN) and silica gel in different stoichiometric ratios. The physicochemical characterization of the prepared AECFs was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, X‐ray diffraction analysis, thermogravimetric analysis (TGA, differential thermal analysis, and differential thermal gravimetry), and elemental analysis (CHNS/O). Ion‐exchange behavior was also observed. The results indicate that addition of silica gel affects the structure and properties of the composite fibers. The addition of silica gel also changes the thermal stability of PAN–silica gel AECFs. The ion‐exchange capacity of the resulting AECFs was found to be 1.98 mequiv/g. POLYM. ENG. SCI., 2013. © 2013 Society of Plastics Engineers

Polymer composites and blends for battery separators: State of the art, challenges and future trends

“…Poly(ethylene oxide) (PEO) shows a semicrystalline structure characterized by a 7/2 chain helix conformation and low melting temperature (66 C), low density (1.20 g/cm 3 ) and ability to solvate a wide variety of salts through interaction of its ether oxygens with cations [36,37]. Poly(acrylonitrile) (PAN) is also a semi-crystalline polymer and has numerous advantages provided by the relatively easy modification of its physico-chemical properties (hydrophilicity, porosity and mechanical strength) [38], being compatible with most salts [39]. Poly(methyl methacrylate) (PMMA) has been used in different applications such as medical and energy application and shows good mechanical strength, excellent optical properties (clarity, brilliance, transparency) and chemical resistance [40,41].…”

Comparatively Thermal and Crystalline Study of Poly(methyl‐methacrylate)/Polyacrylonitrile Hybrids: Core–Shell Hollow Fibers, Porous Fibers, and Thin Films

“…When the PAN was processed into fibers (Figure f), the peak at 2340 cm −1 (CN conjugation) displayed stronger intensity, probably due to the cyclization reaction between DMF and PAN . And the stretching nitrile (CN) group shifted to higher energy position at 2360 cm −1 (CN), ascribing to the interaction of amide nitrogen (DMF) and nitrile group (PAN) . The spectra of raw PMMA powder, PMMA fibers, PMMA/PAN porous thin films, core–shell hollow PMMA/PAN fibers, and PMMA/PAN porous fibers showed a weak peak around 999 cm −1 and two strong peaks at 1146 and 1726 cm −1 , corresponding to the vibrations of C–H, axial asymmetric bend of CCO and PMMA ester (CO) groups, respectively (Figure a–e) .…”

“…The peak at 2362 cm −1 (OCH 3 stretch) was observed in the PMMA powders, but disappeared in the PMMA fibers (Figure b), which may be caused by the severe synthesis condition (high voltage, 15.0 kV), similar to the synthesis procedure of the silica aerogels . Furthermore, the peaks (2362 cm −1 ) of the PAN/PMMA core–shell fibers and porous fibers could be assigned to the stretching nitrile (CN) group of PAN …”

“…[49][50][51][52] And the stretching nitrile (C N) group shifted to higher energy position at 2360 cm −1 ( C N), ascribing to the interaction of amide nitrogen (DMF) and nitrile group (PAN). [50][51][52][53][54] The spectra of raw PMMA powder, PMMA fibers, PMMA/PAN porous thin films, core-shell hollow PMMA/PAN fibers, and PMMA/PAN porous fibers showed a weak peak around 999 cm −1 and two strong peaks at 1146 and 1726 cm −1 , corresponding to the vibrations of C-H, axial asymmetric bend of C C O and PMMA ester ( C O) groups, respectively (Figure 4a-e). [55] The peaks at around 1195-1265 cm −1 were obtained due to the C O C stretching and deformation vibration.…”

An effective removal of methylene blue dye using polyacrylonitrile yarn waste/graphene oxide nanofibrous composite

“…Figure 5a-d shows Figure 5a shows the first stage weight loss at 100°C, due to the water evaporation in the mat. The second stage weight loss occurs at 280°C, due to the decomposition of the polymer chain (Khan and Baig 2013). Figure 5b shows the first weight loss at 100°C for PAN yarn waste/0.5 wt% GO composite mat, which may be attributed to water evaporation.…”