Preparation method of interlocking micro-capsules based on polymer with high specific surface area and having hierarchical porous structure

Abstract

The invention discloses a preparation method of interlocking micro-capsules based on a polymer with a high specific surface area and having a hierarchical porous structure. The method comprises the following steps: modifying a silicon dioxide colloid crystal template, performing controlled graft of a polymer chain segment by surface-initiated atom transfer radical polymerization and double-bond radical polymerization, crosslinking a linear polymer chain segment by using a friedel-crafts crosslinking method, and removing the silicon dioxide colloid crystal template, thus preparing interlocking micro-capsules based on a polymer with a high specific surface area and having a hierarchical porous structure. Through a controlled graft polymer layer, a certain gap is formed in an area which is fully filled before, thereby reducing the mass and forming more mass transfer ways. By adopting a friedel-crafts crosslinking and pore-forming technology, capsule walls made of a polymer material are cross-linked to form micro-pores and meso-pores; the material formed by adopting a friedel-crafts self-crosslinking technology is high in specific surface area, thereby greatly improving the application performance; the capsule cavities at micro-pore, meso-pore and large-pore levels, communication windows formed among interlocking micro-capsules and gaps among the micro-capsules present a hierarchical porous interlocking structure on the whole.

Description

technical field [0001] The technical solution of the invention relates to the field of polymer materials, in particular to a method for preparing interlocking microcapsules with polymer-based hierarchical pore structure with high specific surface area. Background technique [0002] Microcapsule refers to a micro-container with a hollow structure and a shell made of polymer materials, inorganic materials or organic-inorganic hybrid materials. Microcapsules have the functions of protecting the core material in the capsule core, changing the weight, volume, state and surface properties of the material, isolating active ingredients, and controlling the slow release of the core material. In the late 1970s, Narty et al. (Narty J J, Oppenheim R C, Speiser P.Nanoparticles a new colloidal drug delivery system.Pharmaceutica Acta Helvetiae, 1978,53:17-23.) proposed the concept of nanocapsules (Nanocapsules), the Microcapsules have expanded into new materials with nanoscale dimensions....

AI Technical Summary

Problems solved by technology

Its limitations are: (1) In the double-template method, the template should have obvious interfacial interaction or form a strong interaction force (such as hydrogen bond) with the skeleton material, complete self-assembly in the skeleton material, and remove the template Pores can be formed. At present, polymer compounds with special structures are mostly used in the dual-template method. This type of polymer has high requirements for the composition of segmental structural units and molecular weight, and the preparation is cumbersome and expensive. At the same time, the skeleton material can be melamine, etc. Forming polymers with strong hydrogen bonding, these greatly limit the application of the double-template method in the preparation of polymer-based porous materials; (2) for the emulsion polymerization method, the suitable surfactant and ratio are The key to determining the size of the pores, and the pores synthesized by using liquid droplets as templates are prone to collapse and shrinkage, and the pore structure is unstable.

[0006] At present, there is no relevant report on the preparation method of a high specific surface area polymer-based hierarchical pore structure interlocking microcapsules that combines surface-initiated atom transfer radical polymerization, double bond radical polymerization and Friedel-Crafts cross-linking porogenic technology.

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