Polyethylene-b-polyethylene glycol diblock polymer and preparation method thereof

Abstract

The invention relates to a diblock polymer preparation technology and aims at providing a polyethylene-b-polyethylene glycol diblock polymer and a preparation method thereof. The method comprises the following steps of: enabling methoxy polyethylene glycol and diisocyanate to perform nucleophilic reaction under the action of a catalyst, namely dibutyltin dilaurate in an organic solvent to obtain isocyanate-terminated polyethylene glycol; and enabling the isocyanate-terminated polyethylene glycol and polyethylene with signal terminal hydroxyl to perform the nucleophilic reaction under the action of the catalyst, namely the dibutyltin dilaurate in the organic solvent to obtain the polyethylene-b-polyethylene glycol diblock polymer. According to the preparation method provided by the invention, only the two-step reaction is performed through the simple and efficient coupling reaction of the diisocyanate, then the amphiphilic diblock polymer with the regular structure can be prepared, the operation is simple, and the industrialized production is easy to realize; raw materials used by the preparation method are low in price; and the lengths of two chain segments of the block polymer can be arbitrarily regulated within a certain range.

Description

technical field [0001] The invention relates to the preparation technology of diblocks, in particular to polyethylene-b-polyethylene glycol diblocks and a preparation method thereof. Background technique [0002] Polyolefins (represented by polyethylene and polypropylene) are widely used due to their high cost performance, good mechanical properties, stable thermal properties, wide range of crystallinity modulation, excellent processability, good safety and stability, and recyclability. It is widely used in various fields such as industry and agriculture, medical and health care, scientific research, military affairs and daily life. However, because there are only non-polar methyl and methylene structures in the polyolefin structure and lack of functional groups, its surface energy is low, and its dyeability, adhesion, wettability, antistatic properties are poor, and it is compatible with polyolefins. The compatibility of polar polymers is extremely poor and other disadvant...

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Problems solved by technology

[0004] The current synthesis of polyolefin block and graft copolymers are mostly prepared by the above methods, all of which have various shortcomings, and it is difficult to prepare block polymers on a large scale

For example, the transition metal complex needs to be removed after the ATRP reaction is completed, the preparation process of dithioesters in the RAFT method is complicated and difficult to be applied industrially, the NMRP method has shortcomings such as a small range of applicable monomers, and the click chemistry also has complicated preparation steps. The problem

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