Porous polymer microspheres and preparation method thereof

Abstract

The invention relates to polymer porous microspheres assembled by nanosheets and a preparation method thereof, and belongs to the field of polymer functional materials. The invention provides porous polymer microspheres. The porous polymer microspheres take a crystalline or semi-crystalline polymer as a matrix, the polymer microspheres have a microsphere structure formed by self-assembling polymer nanosheets layer by layer, and a porous structure is formed by gaps among the polymer nanosheets. According to the preparation method, anti-solvent vapor induced phase separation and polymer crystallization are ingeniously combined, the polymer porous microspheres assembled by nanosheets are prepared, namely the porous polymer microspheres of a novel structure are prepared, and the preparation method is simple and has universality.

Description

technical field [0001] The invention relates to a polymer porous microsphere assembled by nanosheets and a preparation method thereof, belonging to the field of polymer functional materials. Background technique [0002] Porous polymer microspheres have been reported in a large number of studies and applied in many fields such as drug delivery, environmental protection, energy storage, separation and purification due to their multi-level structure, adjustable composition and size. And the morphology of microspheres (such as surface roughness and surface wrinkling) has important implications for their chemical and physical properties. [0003] At present, the traditional methods for preparing porous polymer microspheres mainly include: suspension polymerization method, dispersion polymerization method, precipitation polymerization method, solution polymer method, acid-base swelling method, distillation precipitation method, post-crosslinking method, etc. In recent years, base...

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Problems solved by technology

[0003] At present, the traditional methods for preparing porous polymer microspheres mainly include: suspension polymerization method, dispersion polymerization method, precipitation polymerization method, solution polymer method, acid-base swelling method, distillation precipitation method, post-crosslinking method, etc. In recent years, based on micro The preparation of polymer microspheres by fluidic technology has a high degree of flexibility in material selection and has become the focus of preparing porous and / or rough-surfaced polymer microspheres. The microfluidic method is to prepare a mixed solution of polymer and template first. Then use microfluidic equipment to prepare polymer microspheres, and then remove the template. However, in the template removal process, it is easy to have problems such as incomplete template removal and channel collapse caused by template dissolution. In addition, its drop-by-drop production method greatly limits Yield

[0004] At present, there is no report in the prior art on the preparation of porous polymer microspheres assembled from nanosheets by combining vapor-induced phase separation (VIPS) with polymer crystallization.

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