Zhejiang University

Bogeng Li

Xiang Gao

Qi Zhang

Yingwu Luo

Song Wang

Wenjun Wang

Jinwei Fang

Shiping Zhu

Pingwei Liu

Guoqiang Yu

The present invention relates to a method for preparing a covalent organic framework (COF) materials—a reversible polycondensation/termination method, the COF materials prepared by the method have high crystallinity, high specific surface area, regular and controllable morphology. The present invention also relates to a method for repairing defects of COF materials—reversible degradation-recombination, the method can eliminate defects of existing COF materials, thereby increasing the crystallinity and specific surface area of COF materials and improving their morphological characteristics.

Method for preparing and repairing covalent organic framework materials

The present invention discloses a multiblock copolymer with narrow molecular weight distribution and a preparation method therefor. According to the present disclosure, a series of multiblock copolymers with narrow molecular weight distribution are prepared by adopting a reversible addition chain transfer free radical polymerization technology in an emulsion polymerization system by controlling the feeding sequence of monomers. The molecular weight of the series of multiblock copolymers meets theoretical expectations, the content of dead polymers is low, and the mechanical properties are greatly improved compared with the traditional triblock copolymers. The present disclosure has the advantages of simple flow equipment, an energy-saving and environment-friendly process, cheap and readily available raw materials, achieves high control of the block number, block types, block molecular weight and other structures in the block polymers, and provides a universal and feasible means for preparing polymer materials with specific structures and functions.

Multiblock copolymer with narrow molecular weight distribution and preparation method therefor

A macromolecular emulsifier with switchable surface activity, and use thereof for preparation of polymer latex is disclosed. By using the macromolecular emulsifier with switchable surface activity as an emulsifier, a reversibly coagulable and re-dispersible polymer latex can be prepared by emulsion polymerization. The polymer latex can achieve the coagulation of latex particles by heating and aerating with nitrogen, air, inert gas and/or adding a small amount of alkali solution; the coagulated latex particles can be restored and re-dispersed into stable latex by aerating with carbon dioxide and/or adding a small amount of acid solution. The coagulation and re-dispersion process is reversible and is easy to control.

Amphiphilic macromolecular emulsifier with switchable surface activity and use thereof in preparation of polymer latex

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Zhejiang, China

Bogeng Li