Surface modification of temperature-responsive polymer particles by an electrically conducting polyaniline shell layer

Abstract

In this research an attempt was made to prepare biocompatible electrically conductive composite polymer particles in view of their wide applications in biotechnology. Temperature-sensitive polymer particles have applications as drug carriers, bioseparators, bioreactor cell activators and diagnostic reagents. So a combination of diverse properties in a single polymer composite is expected to increase its application potential. Here temperature-responsive poly(N-isopropyl acrylamide-methyl methacrylate-N,N -methylene-bis-acrylamide) (P(NIPAM-MMA-MBAAm)) core particles were prepared by emulsion copolymerization without using any stabilizer. In a second step seeded chemical oxidative polymerization of different amounts of aniline was carried out in the presence of submicron-sized core particles to obtain P(NIPAM-MMA-MBAAm)/polyaniline composite particles. For a comparative study, reference polyaniline particles were prepared by chemical oxidative polymerization. Fourier transform IR spectroscopy, UV−visible spectroscopy, thermal and X-ray diffraction analyses showed that composite particles prepared with higher aniline content (0.8 g) per unit mass (g) of core particles had high surface coverage compared with lower aniline content (0.1 g).

Single step modification of micrometer‐sized polystyrene particles by electromagnetic polyaniline and sorption of chromium(VI) metal ions from water

“…The heterogeneous surface with extended outward surface structure of PS/PANi–Fe 3 O 4 composite particles suggests the modification of PS seed particles. At higher aniline content (PS/PANi = 1/0.5), some free nanosized tiny particles comprising either PANi–Fe 3 O 4 or Fe 3 O 4 particles are byproduced via secondary nucleation . Hence, the increase in aniline content favored in situ polymerization and precipitation outside the PS seed particles.…”

Evaluating the performance of citric acid as stabilizer and doping agent in an environment friendly approach to prepare electromagnetic nanocomposite particles

“…At higher Fe 3 O 4 content, it is therefore reasonable to assume that iron oxide nanoparticles are distributed within the fiber‐like network of PANI. In some literature, we have observed the formation of such fiber‐shaped PANI particles under certain conditions . The increasing amount of Fe 3 O 4 nanoparticles and relatively less dense PANI shell layer probably affected the morphology and the arrangement of nanocomposite particles.…”

Hydrophobic poly(lauryl methacrylate)‐coated magnetic nano‐composite particles for removal of organic pollutants

“…FTIR is a useful tool to characterize the structural composition of the colloidal particles . A comparative plot of FTIR spectra of Fe 3 O 4 , Fe 3 O 4 /SiO 2 and Fe 3 O 4 /SiO 2 /P(LMA‐DVB) composite particles is shown in Fig.…”