Organic-inorganic hybrid core-shell particle as well as preparation method and application thereof

Abstract

The invention discloses an organic-inorganic hybrid core-shell particle as well as a preparation method and application thereof. According to the organic-inorganic hybrid core-shell particle, a monodisperse SiO2 nano particle is used as a shell layer; a hyperbranched polymer is used as a core; the hyperbranched polymer is synthesized through a condensation polymerization between AB3 and AB2 type monomers. The preparation method of the organic-inorganic hybrid core-shell particle comprises the following steps of 1), synthesizing an ABx type monomer through a Michael addition reaction, wherein the ABx type monomer is a compound of the AB3 and AB2 type monomers; 2), preparing Pickering emulsion by using the SiO2 nano particle as a stabilizer, the ABx type monomer as a liquid phase and a block polymer and a polyamine as synergetic stabilizers; 3), preparing to obtain the organic-inorganic hybrid core-shell particle through a polymerization technique of the Pickering emulsion and an interfacial self-assembly technique between the liquid phase and the nano particle. The organic-inorganic hybrid core-shell particle can be used for enhancing and toughening epoxy resin; the toughness and the strength of a cured body of the epoxy resin are obviously improved; meanwhile, the tensile property, the elastic modulus and the glass-transition temperature of resin are ameliorated drastically.

Description

technical field [0001] The invention relates to a core-shell particle and its preparation method and application, in particular to an organic-inorganic hybrid core-shell particle, its preparation method and application. Background technique [0002] Epoxy resin has many advantages, such as excellent process performance, mechanical properties and thermal stability, etc., but due to the high crosslinking density of its curing system, the internal stress generated during the curing process is not easy to eliminate, resulting in high brittleness of the cured body, insufficient toughness, and limited The application of epoxy resin in many fields, especially in the field of advanced structural materials. Therefore, the toughening modification of epoxy resin has attracted the attention of many researchers. There are many ways to toughen epoxy resins, but most of the ways tend to reduce other properties, especially strength, while achieving toughness. There are many two-phase inte...

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Problems solved by technology

However, the relevant research results of core-shell nanoparticles modified epoxy resin still need to be further developed and improved, mainly in the following two aspects: On the one hand, when the concentration of core-shell particles is high, the viscosity of epoxy resin increases, which affects its workability , and the dispersion of core-shell particles in the resin matrix is ​​not good, and they are easy to agglomerate, resulting in a decrease in performance. Core-shell nanoparticles with better effect mainly graft polymers to the surface of inorganic nanoparticles, attempting to use the rigidity of inorganic nanoparticles and the activity of polymers to synergistically modify epoxy resins, but at the expense of the unique surface effect of nanomaterials And the small size effect, resulting in an increase in toughness, while the increase in mechanical properties such as strength is not obvious

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