Porous palygorskite‐polythiophene conductive composites for acrylic coatings

Abstract

Modified palygorskite-polythiophene (MPA-PTh) composites were prepared by chemical oxidative polymerization of palygorskite (PA) nucleartor with thiophene (Th) after the surface modification with c-(2,3-epoxypropoxy) propytrimethoxysilane (KH-560). The MPA-PTh composites were doped in iodine vapor to create the porous palygorskite-polythiophene (PMPA-PTh) conductive composites. Fourier transform infrared spectra (FTIR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N 2 adsorption-desorption isotherms using the Brunauer-Emmett-Teller method (BET) and electrochemical impedance spectrum (EIS) techniques were applied to characterize the modified PA and the prepared composites. According to FTIR and XPS, the KH-560 was bound to the PA surface and the iodine ion (I 3 À and I 5 À ) entered the PTh molecular chains. XRD, SEM, TEM, BET, and EIS analysis confirmed that the doping of iodine not only transform the core-shell MPA-PTh into the PMPA-PTh but also improve the electrical conductivity of composites. The PMPA-PTh composites were fabricated that yield a volume resistivity of $2.44 Â 10 2 X cm and a internal resistances of $100 X, and their BET surface area, BJH (Barrett-Joiner-Halenda) average pore size and BJH cumulative pore volume were improved in comparison with those of the MPA-PTh composites. SEM images showed that the PMPA-PTh composites could form consecutive space network and the PMPA-PTh composites acrylic coating films had advisable conductivity.

Biodegradable porous organosilicone‐modified collagen fiber matrix: Synthesis and high oil absorbency

“…The absorption peak at 3424 cm −1 (stretching vibration of surface –NH 2 ) in raw CF shifted to the lower wave‐number position, that is, 3423, 3399, and 3398 cm −1 in modified CFs, suggesting that hydrogen bonds were broken in the modification reaction . Additionally, the intensities of the bands in the region 2923–2942 cm −1 (stretching vibration of CH) were enhanced, which was attributed to the hydrocarbon chains of organosilicone covalently anchored to the CF surface . Compared with pristine CF, the new peaks at 1000–1100 cm −1 in modified CFs can be assigned to SiOSi chains of organosilicone .…”