Preparation and comparative properties of membranes based on PANI and three inorganic fillers

Abstract

Abstract.In this study, we compare the effects of aniline-modified mesoporous silica (AMS), raw silica (ARS) and nonmodified raw silica (NRS) particles on the physical properties of as-prepared polyaniline (PANI)-silica mesocomposites (PSM) and nanocomposites (PSN) and PANI-raw silica (PRSN) membranes. First, aniline-modified silica particles were synthesized by a conventional base-catalyzed sol-gel reaction of tetraethyl orthosilicate (TEOS) in the presence or absence of N-[3-(Trimethoxysilyl) propyl]aniline (PAPTMS). Subsequently, PSM, PSN and PRSN materials were prepared through in situ oxidation polymerization reaction of aniline monomer in the presence of AMS, ARS and NRS particles. It should be noted that all the properties of PSM membranes improved substantially from those of PSN and PRSN. For example, upon 3 wt% loading of AMS particles, 10, 25, 10, and 85% increases in thermal stability, mechanical strength, surface hydrophilicity and gas permeability were observed for PSM membranes, respectively, as well as more than 45% reduction in the thermal conductivity.

Inorganic–organic nanohybrid of MoS2-PANI for advanced photocatalytic application

“…According to BET classification, the graph shown matches well with TYPE H4, Fig. 1 Steps involved in the synthesis of MoS 2 -PANI composite according to standard IUPAC classification, and forms hysteresis loop which is observed for mesoporous structures [16,17]. The pore diameter and volume are found to be 2.39 nm and 0.071 cc/g, respectively.…”

Hierarchical porous polyaniline supercapacitor electrode from polyaniline/silica self‐ aggregates

“…Figure (a) displays the Nyquist plot of the obtained porous PANI, which consisted of a semicircular loop and a straight line . By using the same three‐electrode electrochemical cells as were used in the CV experiments, the AC impedance of the porous PANI was determined to be in the frequency range from10 5 to 0.01 Hz with an amplitude of 5 mV.…”

“…(b). Using the equation Z = 1/( jωC ) n (where Z is the complex impedance and ω , C and n are the angular frequency, the ideal capacitance and an empirical constant, respectively), the value of n for the porous PANI was calculated to be 0.9312, suggesting excellent supercapacitive behavior.…”

Antidegradation and reinforcement effects of phenyltrimethoxysilane- or N-[3-(trimethoxysilyl)propyl]aniline-modified silica particles in natural rubber composites

“…For the ATMS-functionalized silica particles (AM-Si), the absorption bands at 3675 and 2981 cm À1 represented the NeH stretching of the NeH bond [55] and the CeH stretching vibration of chain methylene (-CH 2 ) groups, respectively [29]. The characteristic peaks of the aniline groups appearing at 1605 and 1507 cm À1 were assigned to the stretching of C]N and C]C from the quinone and benzene ring vibrations [34,56], respectively. Additionally, the peak at 697 cm À1 corresponded to the phenyl H out-of-plane ring deformation vibration [53], which appeared in both the PhM-Si and AM-Si particles.…”

“…In order to solve this problem of silica aggregation, modification of the silica particles was evaluated in this research. Several kinds of organoalkoxysilane have previously been used to modify the silica surface, such as methyltriethoxysilane [18,19], vinyltriethoxysilane [19,20], phenyl triethoxysilane [20e25], phenyltrimethoxysilane (PhTMS) [22,26,27], 3-mercapto trimethoxysilane [18,28e31] and N- [3-(trimethoxysilyl)propyl]aniline (ATMS) [32e34] to improve the wettability [22,27,32,35e37], dispersibility [26,28,33,34,38] and selective adsorption [23e25,29e31]. The important factors that determine the ability of the modifying agent(s) to improve these properties of NR include the type and polarity of the modifying agent and the size of its substituted groups.…”