Gemini type cationic surface active initiator and preparation method thereof

Abstract

The invention relates to a gemini type cationic surface active initiator and a preparation method thereof. According to the invention, a gemini amphiphilic compound containing bis-imidazole cation and diisooctane groups is synthesized; the compound has the characteristics of better emulsification of oily monomer compared with common cationic surfactants, and a hydrophilic part, i.e., tertiary amine, of the compound may undergoe a redox reaction with potassium persulfate at room temperature; cationic radicals are formed on nitrogen atoms at first and then converted into carbon radicals at adjacent positions; production of the free radicals can be repeated a plurality of times and flexibly controlled; a serially-initiated multiphase tandem polymerization mode is realized; and polymerization of styrene and vinyl acetate and polymerization of styrene and N-vinyl pyrrolidone are sequentially initiated on a water-oil interface so as to obtain a multi-block copolymer. Experiment results show that the feed ratio of monomer is consistent with the composition ratio of the copolymer, which indicates that the initiator has high initiation efficiency; and a polymerization reaction of such a pattern has mild and controllable reaction conditions and low energy consumption, does not use other organic solvents and emulsifiers, enables a product to be pure, and completely meets the requirements of green chemistry.

Description

technical field [0001] The invention relates to the technical field of polymer material synthesis, in particular to a gemini-type cationic surface-active initiator and a chemical preparation method thereof. The novel initiator can be used for the green synthesis of various polyolefin polymer materials. Background technique [0002] Polyolefins are a very important class of polymer materials with a wide variety of applications. Such materials are generally obtained by homopolymerizing or copolymerizing olefin monomers through initiators. According to different polymerization occasions, free radical initiators can be divided into two categories: oil-soluble and water-soluble, which are used for oil-soluble and water-soluble monomers respectively. For the polymerization of monomers, water-soluble initiators can also initiate the polymerization of oil-soluble monomers by diffusing into tiny emulsion micelles. In the existing polymer polymerization technology, the free radical i...

AI Technical Summary

Problems solved by technology

For example, living radical polymerization technology can make the synthesis of block copolymers easy and convenient, but these living radical polymerizations can only be carried out in the organic phase generally, and cross-phase polymerization cannot be achieved. The synthesized block polymers are suitable for Insufficient property, limited application value, so far unable to be popularized in large quantities, the present invention aims to realize a new cross-phase polymerization method - multi-phase serial polymerization, so that the preparation of polyolefin polymer materials can reach a new level

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