Conductive blends of polyaniline with plasticized poly(methyl methacrylate)

Abstract

Polyaniline (PANI) protonated with camphorsulfonic acid (CSA) and three different poly(alkylene phosphates) (PAPs) (where alkylene ϭ pentylene, hexylene, or nonylene) was used in the fabrication of conductive polyaniline-poly(methyl methacrylate) (PMMA) blends. The lowest percolation threshold ( f p ϭ 0.041 wt %) was obtained for the PANI(CSA) 0.5 -PMMA blend plasticized with 35 wt % of dibutyl phtalate (DBPh). This blend is also very resistant against the deprotonation of its conductive phase in basic solutions of pH ϭ 9. In the case of blends prepared with the use of PAPs as PANI dopants, the percolation threshold strongly depends on the length of the hydrophobic spacer (alkylene group) in the dopant. The percolation threshold decreases in the order PPP Ͼ PHP Ͼ PNP, whereas the resistance against deprotonation in basic solutions decreases in the following inverse order: PNP Ͼ PHP Ͼ PPP. This last observation can be rationalized by increasing contribution of hydrophobic segments in the polymeric dopant, when going from PPP to PNP, which renders polyaniline more resistance toward the penetration by aqueous basic solutions.

The pluripotency homeobox gene NANOG is expressed in human germ cell tumors

“…Xia et al40 and Juvin et al41 discussed the relationship between the UV–vis spectra of protonated PANI and the conformation of its chain. They pointed out that the emeraldine adopts an extended coil conformation that promotes the delocalization of polarons in particular solvent‐protonating acid systems, such as m ‐cresol/CSA.…”

Electronically conductive polymers

“…Blends of PANI-DCAA with PVC have also been used for the preparation of conductive composites [51b] with PTC below 1% of PANI. PANI-CSA blend with PMMA, plasticized with 35 wt% of dibutyl phthalate [64], has PTC of 0.041 wt%. It also has been found to be very stable against deprotection of its conductive phase in basic solution of pH 9.…”

Interplay of Hopping and Percolation in Organic Conducting Blends

“…Experimental PANI is doped with camphor-sulfonic acid (CSA) and blended with poly(methyl methacrylate) (PPMA) as described in Ref. [6]. The PANI content p is defined as the mass fraction of emeraldine base in the sample.…”