Synthesis of Hollow Conductive Polypyrrole Balls by the Functionalized Polystyrene as Template

Abstract

We report the preparation of hollow spherical polypyrrole balls (HSPBs) by two different approaches. In the first approach, core-shell conductive balls, CSCBs, were prepared with poly(styrene) as core and polypyrrole (PPy) as shell by in situ polymerization of pyrrole in the presence of polystyrene (PS) latex particles. In the other approach, CSCBs were obtained by in situ copolymerization of pyrrole in the presence of PS(F) with hydrophilic groups like anhydride, boronic acid, carboxylic acid, or sulfonic acid, and then HSPBs were obtained by the removal of PS or PS(F) core from CSCBs. TEM images reveal the spherical morphology for HSPBs prepared from PS(F). The conductivity of CSCBs and HSPBs was in the range of 0.20–0.90 S/cm2.

Enhanced Diffusion Kinetics of Li Ions in Double-Shell Hollow Carbon Fibers

“…Subsequently, the sulfonated HPSFs were dispersed in a water/ethanol solution and used as the hard template once the pyrrole monomer was added (Scheme ). − The in situ polymerization of pyrrole occurred on both the inner and outer sides of HPSFs when the oxidant (FeCl 3 or APS) was added, resulting in the formation of the core–shell PS@PPy composite (Figure S4). The SEM images indicated the morphological change from smooth to rough, and the thickness of the PPy coating layer gradually grew larger with a gradual increase in the pyrrole monomer concentration (the digits “0.1, 0.2, and 0.4” of HPSFs@PPy-FeCl 3 –0.1/0.2/0.4 stand for the different amounts of the pyrrole monomer added into the sulfonated HPSF-containing solutions).…”

Colloid electrochemistry of conducting polymer: towards potential-induced in-situ drug release

“…In contrast, colloidal drug delivery systems with particulate carriers such as micelles, liposomes, nano-and microparticles have been proven to have excellent ability for drug encapsulation, controlled release and targeting delivery [27]. Different triggering mechanisms based on pH [28], temperature [29], light [30], enzyme [31], and magnetic-field [32] had been developed for controlled drug release in colloidal delivery systems. Such particle delivery systems have the advantage of small and controllable size, large surface-area-to-volume ratio for maximizing drug loading and enhanced drug release, relatively easy to produce, and more importantly highly dispersible and injectable for site-specific targeted drug delivery [33][34][35].…”

Pure Nanoscale Morphology Effect Enhancing the Energy Storage Characteristics of Processable Hierarchical Polypyrrole

“…The hollow spherical microparticles possess the advantage of carrying materials inside the cavity, which is valuable for drug delivery in combination with biocompatibility. , Hollow sphere micromorphology is beneficial for energy applications due to the better accessibility of structured material, ensuring faster charge/discharge kinetics and higher capacitance. − The most commonly used method includes the formation of shells of the conducting polymer on template beads, followed by selective dissolution of the template. This approach has been applied for polyaniline, polypyrrole (PPy), − and poly­(3,4-ethylenedioxythiophene) . Alternatively, hollow microspheres can be fabricated via template-free synthesis based on the self-assembly of monomers in a micellar microenvironment. − …”