Synthesis, characterization, and applications of polyvinylpyrrolidone/SiO₂ hybrid materials

Abstract

This research discusses the properties of hybrid materials formed by polyvinylpyrrolidone (PVP) and tetraethoxysilane (TEOS) of different weight ratios, by the sol-gel process, to evaluate the feasibility of its application to process-dyed nylon fabrics. After using equipment including FTIR, 13 C-NMR, and SEM, it was shown that PVP and SiO 2 are connected by hydrogen bonds, further showing the existence of special functional groups and the porous structure in hybrid materials. The pore size of the hybrid materials, specific volume of pores, and the specific surface area increased with increasing weight ratio of TEOS. In addition, the TGA testing results showed that the thermoresistance of hybrid materials can be improved. The color of the treated fabrics darkened if dyed nylon fabrics were treated by hybrid materials. When using metal complex acid dye for certain fabrics, when hybrid materials were used in finishing, there was significant improvement to the fabric's hygroscopicity and its colorfastness against chlorine.

CNF-reinforced polymer aerogels: Influence of the synthesis variables and economic evaluation

“…In conclusion, the solvent seemed not to affect the structure of the CNF-reinforced polymer aerogels. CNF-reinforced polymer aerogels obtained are comparable in shape to carbon nanotube sponges and graphene foam employed as building blocks and assembled into macroscopic 3D architectures [62,63]. However, the harmful and expensive precursors or complex equipment involved in the syntheses of the latter materials drastically hinder the large-scale production of these carbon-based aerogels for further applications.…”

Tailor-Made Aerogels Based on Carbon Nanofibers by Freeze-Drying

“…41 47 48 However, the TGA profile of sample GEL (60% PVA) exhibited two degradation stages. In the first stage (255-404 C) acetate radicals were generated, which substrated hydrogen from the PVA and led to the formation of a polyolefinic backbone.…”

“…However, PVA, PVP, gelatin and arabic gum, which are soluble in water and in a wide range of organic solvents, produced CNF aerogels with a dense 2D sheet-like structure. [41][42][43][44] This fact suggests that the hydrophilic character of the polymer can affect the final structure. In a freeze drying process, the rapid sublimation of ice particles in the polymer structure could generate a very high porosity.…”

Dissolution rate enhancement of the poorly water-soluble drug Tibolone using PVP, SiO2, and their nanocomposites as appropriate drug carriers

“…The physicochemical characteristics of this PVP/SiO 2 nanocomposite matrix may be different compared to the initial materials. Examining the literature it was found that PVP interacts with the silanol groups of SiO 2 33 . As reported, the PVP molecules are not washed by the silica surfaces when the ratio because of bonding in multicentered adsorption complexes, creating a monolayer of PVP on the nanoparticles' surface.…”