Hybrid silica-based composites

Ordered inorganic-organic hybrid silica-based composites include the following [48] (1) as-made (uncalcined or unextracted) surfactant-silica mesophase, (2) surface-modified mesoporous silica, (3) periodic mesoporous organosilica (PMO), (4) organic-containing mesoporous Si02-... 

Inorganic Hybrid Materials Based on Mesoporous Silica Composites for Humidity Sensing Applications... 

The hybrid materials having silica content below 50 wt% were composed of polyimide matrix with finely dispersed silica particles, and their hardness values were very close to that of the matrix polyimide. On the other hand, the hybrid materials having a silica content over 50 wt% were very hard and tough, and their hardness values increased with increasing silica content. In the latter hybrid materials, the silica formed a continuous phase with polyimide as the minor phase that probably acts as binder. This is a new type of polyimide-based composite, and may be referred to as polyimide-reinforced silica glass , al-... 

Usually the silica/polymer composites are prepared with styrene, MMA, BA, or their copolymers. However, few reports cover experiments with less commonly used polymers such as poly(styrene sulfonic acid) (PSSA), poly(hydroxyethylmethacry-late) (PHFMA), poly(aminoethylmethacrylate) PAEMA [133], polyethylene (PE) [134], or polyamides [135]. Using a miniemulsion of nickel-based catalysts for the polymerization of ethylene, which is dispersed in toluene in the presence of hy-drophobically modified silica particles, PEysilica hybrids could be prepared [134]. The ethylene is introduced into the system by bubbling through the miniemulsion. The hydrophobic moiety of the silica particles interacts with the growing polymer and leads to lentil-shaped or isotropic hybrids. Lentil-shaped particles are composed of semicrystalline PE, whereas the isotropic hybrids are composed of amorphous polymer. The crystallinity of the polymer is determined by the choice of polymerization catalyst. Silica/polyamide hybrid nanoparticles were prepared with 3-aminopropyltriethoxysilane (APS)-modified silica particles [135]. These particles were dispersed in sebacoylchloride and the solution miniemulsifled in an aqueous... 

In addition, our group have fabricated another type of pillar[5,6]arene-based material, hybridized with silicon dioxide. The perhydro3q l-pillar[5]-arene and perhydro>y l-pillar[6]arene were attached onto the hydrophilic silica supports through covalent bonds. This pillar[n]arene-based composite can act as an absorbent hybrid material for some typical herbicides. 

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