Silica nanoparticles modified with vinyltriethoxysilane and their copolymerization with N,N′‐bismaleimide‐4,4′‐diphenylmethane

Abstract

ABSTRACT:The synthesis and characterization of the vinyltriethoxysilane-modified silica nanoparticles were investigated. It was shown that the vinyltriethoxysilane molecules had been successfully grafted onto the silica nanoparticles. The native and silane-modified silica dispersions in N-methyl-2-pyrrolidone with the total solids contents within the range 1-6 wt % exhibited dramatically different flow behaviors. The polymerization of N,N 0 -bismaleimide-4,4 0 -diphenylmethane (BMI) initiated by barbituric acid in the presence of the native or vinyltriethoxysilanemodified silica nanoparticles were then carried out in gbutyrolactone (total solids content ¼ 20%). The higher the level of silica, the better the thermal stability of the BMI/silane/silica composite particles. The silane-modified silica particles significantly improved their dispersion capability within the continuous BMI oligomer matrix. Furthermore, the degree of dispersion of the vinyltriethoxysilane-modified silica particles in the BMI oligomer matrix decreased with the weight percentage of silica based on total solids increased from 20 to 40 wt %.

Synthesis and characterization of phenylsiloxane‐modified bismaleimide/barbituric acid‐based polymers with 3‐aminopropyltriethoxysilane as the coupling agent

“…In an attempt to enhance the thermal stability of BMI/BTA polymers, vinyltriethoxysilane‐modified silica nanoparticles were prepared and characterized in our previous work . It was shown that the higher the level of silica, the better the thermal stability of the BMI/silane/silica composite particles.…”

Observation of silane coupling agents adsorbed on silica by solid state 1H NMR under fast magic angle spinning

“…Previous work using TGA was reported to calculate the content grafted onto the surface according to the difference in the weight loss between the native silica nano-particles and surface-modified silica nanoparticles [6,26]. But it cannot provide directly the knowledge about the nature of the adsorbed layers.…”

Effects of filler modification and structuring on dielectric enhancement of silicone rubber composites

“…If suspension of filler in a fluid is exposed to an electric field, the electrostatic absorption force resulted from mutual dielectrophorisis of two adjacent particles is the main factor for creating a chain structure in the direction of electric field [6]. Some of the investigated surfactants not only stabilize the suspension by creating compatibility between organic polymer and inorganic filler, but also enhance the ER effect by increasing polarizability of the particles [7,8,9]. Application of a silane modifier in composites made of barium titanate dispersed in polyvinylidene fluoride showed a better dispersability of filler as well as improved mechanical and dielectric properties [8].…”