Synthesis of polyaniline nanofiber and copolymerization with acrylate through in situ emulsion polymerization

Abstract

Polyaniline (PANI) was prepared, respectively, by direct mixed oxidation method in different acids. Scanning electron microscopy showed that high quality of PANI nanofibers can be obtained easily in hydrochloric acid, sulfuric acid, and acetic acid, especially in the sulfuric acid; infrared and ultraviolet spectra characterization showed all products were the doped PANI. Then, using complex emulsifiers, PANI was dispersed in acrylate emulsion by supersonic dispersion assisted with mechanical stirred to obtain mixed pre-emulsion, the result showed different PANI performed different dispersing stability in the pre-emulsion. More importantly, PANI-polyacrylate copolymer was prepared through multi-steps in situ emulsion polymerization using water-soluble azo (VA-044) as initiator. Experiment showed that good dispersing stability of PANI in the pre-emulsion was premise to obtain the final stable copolymer emulsion. Further, the micro-morphology and thermal property of the copolymer were studied by transmission electron microscopy, differential scanning calorimetry, and thermogravimetric analyzer. The result proved that acrylate occurred in situ polymerization on surface of PANI nanofibers, the presence of PANI increased glass transition temperature (T g ) and thermal decomposed temperature of the copolymer.

Preparation of silver-plated polyimide fabric initiated by polyaniline with electromagnetic shielding properties

“…The FTIR spectra of untreated PI fiber, PANi doped HNO 3 and PANi/PI fabric are presented in Figure 2. The FTIR spectra of PANi and PANi/PI fabric were similar to those reported previously [17,30]. As seen in Figure 2(c), the characteristic peaks at 1565 cm −1 and 1487 cm −1 were attributed to ring-stretching vibrations of the quinone ring skeleton (Q) and benzene ring skeleton (B) of PANi.…”

Polyaniline nanofibers for In situ MAO‐catalyzed polymerization of ethylene

“…The first absorption band with maximum at 339 nm is associated with the p-p* electron transition of the benzoid segments, the second and third absorption bands at 432 and 800 nm are related to the acid-doped state and polaron formation, respectively. 16 The FTIR spectrum of PAni-nanofibers (Figure 3) shows structural characteristics consistent with previous reports 17,18 : absorption bands in the spectrum are observed at around. 1570 and 1500 cm 21 (quinoid and benzenoid stretching rings, respectively), in the range of 1290-1250 cm 21 (CAN stretching of aromatic secondary amines), 1130-1140 cm 21 (C@N stretching) and around 800 cm 21 (1,4-substituted phenyl ring stretching).…”

Preparation and application of polyaniline nanofibers: an overview

“…PANI nanofibers have been prepared by rapid mixing oxidation in different kinds of acids such as HCl, H 2 SO 4 , H 3 PO 4 , acetic acid and oxalic acid. PANI obtained in H 2 SO 4 system possessed the best morphology with uniform diameter of about 60 nm; furthermore, the fibers reached several micrometers in length and formed a dense network structure …”

“…PANI obtained in H 2 SO 4 system possessed the best morphology with uniform diameter of about 60 nm; furthermore, the fibers reached several micrometers in length and formed a dense network structure. 73,74 During the course of synthesizing PANI nanofibers by rapid mixing polymerization using APS/Fe 2+ as redox initiator, the addition of Fe 2+ substantially increased the polymerization rate. 75 The sulfate radical anion with a standard redox potential of 2.6 V is used as a substantial oxidant for the polymerization of aniline.…”