Green preparation method of vinyl chloride/isoprene copolymer

Abstract

The invention relates to a green preparation method of a vinyl chloride / isoprene copolymer as a thermoplastic elastomer. The preparation method is copolymer synthetic technology formed based on water / oil interfacial free radical polymerization. The preparation method is characterized by specially using a gemini surface active initiator to carry out redox reaction with potassium persulfate under normal temperature, repeatedly generating free radicals on the interfaces for multiple times and triggering independent polymerization reaction between vinyl chloride and isoprene and connecting the two chain segments together in series by initiator molecules, thus forming the multiblock polymer. Experiments prove that when the pH value of the aqueous medium is 4-4.5, the feed ratio of monomers is quite consistent with the component ratio of the copolymer; the content of the isoprene chain segment in the copolymer is adjustable in the range of 10-42wt.%; the polymerization reaction in such a mode is mild and controllable in conditions, is low in energy consumption and dispenses with other organic solvents and emulsifiers; the product is 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 preparation method of a vinyl chloride / isoprene copolymer, which is a thermoplastic elastomer, and its advanced preparation method meets the requirements of green chemistry. Background technique [0002] With the rapid development of modern science and technology and society, people have higher and higher requirements for the performance of polymer materials and are increasingly diversified and multi-functional. A single polymer is often difficult to meet people's needs, and the modification of polymer materials is becoming more and more important. Very important. Thermoplastic elastomer (TPE) is a new type of polymer elastomer material that shows the elasticity of rubber at room temperature, can be plasticized at high temperature, and has excellent processing performance. It has the characteristics of no vulcanization, easy processing, low cost, and recyclab...

AI Technical Summary

Problems solved by technology

The existing PVC-TPE preparation methods all focus on physical methods, which can be divided into three types: blending with elastomers, introducing cross-linked structures, and plasticizing high relative molecular weight polyvinyl chloride. Vinyl chloride is a monomer with low polymerization activity. , generally rarely copolymerized with other olefin monomers, which greatly limits the development space of its chemical modification

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