Multifunctional electroactive electrospun nanofiber structures from water solution blends of PVA/ODA–MMT and poly(maleic acid-alt-acrylic acid): effects of Ag, organoclay, structural rearrangement and NaOH doping factors

Abstract

Multifunctional electroactive electrospun nanofiber structures from water solution blends of PVA/ODA-MMT and poly(maleic acid-alt-acrylic acid): effects of Ag, organoclay, structural rearrangement and NaOH doping factors AbstractNovel multifunctional colloidal polymer nanofiber electrolytes were fabricated by green reactive electrospinning nanotechnology from various water solution/dispersed blends of poly (vinyl alcohol-co-vinyl acetate) (PVA)/octadecyl amine-montmorillonite (ODA-MMT) as matrix polymer nanocomposite and poly(maleic acid-alt-acrylic acid) (poly(MAc-alt-AA) and/or its Ag-carrying complex as partner copolymers. Polymer nanofiber electrolytes were characterized using FTIR, XRD, thermal (DSC, TGA-DTG), SEM, and electrical analysis methods. Effects of partner copolymers, organoclay, in situ generated silver nanoparticles (AgNPs), and annealing procedure on physical and chemical properties of polymer composite nanofibers were investigated. The electrical properties (resistance, conductivity, activation energy) of nanofibers with/without NaOH doping agent were also evaluated. This work presented a structural rearrangement of nanofiber mats by annealing via decarboxylation of anhydride units with the formation of new conjugated double bond sites onto partner copolymer main chains. It was also found that the semiconductor behaviors of nanofiber structures were essentially improved with increasing temperature and fraction of partner copolymers as well as presence of organoclay and AgNPs in nanofiber composite.

Recent Advances in the Synthesis of Metal Oxide Nanofibers and Their Environmental Remediation Applications

“…In recent times, electrospun metal oxides' precursors have garnered much interest for the production of multifunctional nanofibers [109,110]. Figure 5 defines the approach for the synthesis of an electrospun metal oxide nanofiber.…”

Evaluation of the physicochemical and antimicrobial properties of the polyvinyl alcohol-mulberry leaf extract blend film

“…The polymeric -OH stretching appeared between 3262 cm -1 and 3263 cm -1 , where this exhibited broad band gaps indicates the inter-hydrogen bonded O-H stretching vibration of the hydroxyl group. [36,37] In the PVA/MN blend film, -OH stretching vibration of PVA slightly increased to higher value 3262 cm -1 and 3263 cm -1 , meaning that there is strong intermolecular interactions between the PVA matrix and MN. This broad absorption also might due to to a rise from the O-H stretching frequency of PVA and water -OH group.…”

“…[39] The alkyl C-H stretching in CH3, CH2 and CH group and bending band from backbone chains of the matrix and chemical compound occurred at 2928 cm -1 and 1423 cm -1 . [36,25,35,40,37] It is also stated that between 2928 cm -1 and 2929 cm -1 band gap there is a presence of methyl C-H asymmetric stretching. The presence of this group was confirmed by R. Jayasekara et al where at peak 1324 cm -1 attributed to the C-H stretching, bending and C-O stretching of PVA.…”

“…[38,35] Moreover, according to Murat Simsek et al, a presence of band gap between 1715 cm -1 and 1595 cm -1 can be due to the symmetric -C=O stretching from -COOH and -COOR (saturated ester) group. [37] Next, the absorption band occurred at 1040 cm -1 is assigned to the C-O stretching of PVA/MN structure. [24,17,41] The most appreciable changes were observed in the FTIR spectrum of PVA/MN blend films where the formation of absorption peak between 1410 cm -1 and 1290 cm -1 is the primary or secondary -OH stretch, phenol and tertiary alcohol OH bend.…”