Comparative Studies of the Dielectric Properties of Polyester Imide Composite Membranes Containing Hydrophilic and Hydrophobic Mesoporous Silica Particles

Abstract

In this paper, comparative studies of hydrophilic and hydrophobic mesoporous silica particles (MSPs) on the dielectric properties of their derivative polyester imide (PEI) composite membranes were investigated. A series of hydrophilic and hydrophobic MSPs were synthesized with the base-catalyzed sol-gel process of TEOS, MTMS, and APTES at a distinctive feeding ratio with a non-surfactant template of D-(-)-Fructose as the pore-forming agent. Subsequently, the MSPs were blended with the diamine of APAB, followed by introducing the dianhydride of TAHQ with mechanical stirring for 24 h. The obtained viscous solution was subsequently coated onto a copper foil, 36 μm in thickness, followed by performing thermal imidization at specifically programmed heating. The dielectric constant of the prepared membranes was found to show an obvious trend: PEI containing hydrophilic MSPs > PEI > PEI containing hydrophobic MSPs. Moreover, the higher the loading of hydrophilic MSPs, the higher the value of the dielectric constant and loss tangent. On the contrary, the higher the loading of hydrophobic MSPs, the lower the value of the dielectric constant with an almost unchanged loss tangent.

Leaf on a Film: Mesoporous Silica-Based Epoxy Composites with Superhydrophobic Biomimetic Surface Structure as Anti-Corrosion and Anti-Biofilm Coatings

“…Likewise, the pore volume for ARS is 0.04 cm 3 /g, and for AMS, it escalates to 0.42 cm 3 /g, marking an approximately tenfold increase. This confirms the successful preparation of mesoporous materials from aminosilane-functionalized silica spheres [34].…”

“…After modification by APTES, signals for T 2 and T 3 from the organic silicon series were observed at chemical shifts of −63 ppm and −66 ppm, respectively. By consolidating the evidence from 13 C SS-NMR and 29 Si SS-NMR, it can be affirmed that the -NH 2 active functional group has been successfully bonded within the SiO 2 mesoporous material [ 34 ].…”

Advanced Science and Technology of Polymer Matrix Nanomaterials

“…Yeh et al [30] studied the impact of hydrophilic and hydrophobic mesoporous silica particles (MSPs) on the dielectric properties of composite membranes derived from polyester imide (PEI). The study revealed a clear trend in the dielectric constant of the membranes: PEI containing hydrophilic MSPs > PEI > PEI containing hydrophobic MSPs.…”

Effect of Silicone Modifier on the Physical Properties of Flexible Silica Aerogels

“…Figure 3 shows the representative spectra of the 13 Moreover, Figure 4 showed the representative spectra of the 29 Si-NMR spectra of asprepared flexible silica aerogels (i.e., FSA, FSA-M1, FSA-M5, FSA-M10, and FSA-T10). For example, the characteristic signal values of -Si(OSi)3 (denoted by T3) and -Si(OSi)2OH (denoted by T 2 ) can be assigned at the positions of −67.1 ppm and −57.5 ppm, respectively [28]. Moreover, Figure 4 showed the representative spectra of the 29 Si-NMR spectra of asprepared flexible silica aerogels (i.e., FSA, FSA-M1, FSA-M5, FSA-M10, and FSA-T10).…”

“…Moreover, Figure 4 showed the representative spectra of the 29 Si-NMR spectra of asprepared flexible silica aerogels (i.e., FSA, FSA-M1, FSA-M5, FSA-M10, and FSA-T10). For example, the characteristic signal values of -Si(OSi) 3 (denoted by T3) and -Si(OSi) 2 OH (denoted by T 2 ) can be assigned at the positions of −67.1 ppm and −57.5 ppm, respectively [28].…”