Method for catalytically preparing vinyl ether polymers

Abstract

The present invention relates to the technical field of polymer preparation, and in particular to a method for preparing vinyl ether polymers with high stereoregularity through chiral acid-catalyzed polymerization. The invention provides an acid-catalyzed method for preparing vinyl ether polymers with high stereoregularity. In a protective atmosphere, one or more vinyl ether monomers are heated at room temperature 25 under the action of a selected catalyst. Cationic polymerization occurs at ℃ to -78℃ to obtain alkenyl ether polymers with high stereoregularity. In the present invention, iminophosphoramide (PA) reacts with vinyl isobutyl ether to generate active cations to initiate polymerization. The iminophosphoramide anions realize controllable polymerization by interacting with the active cations at the chain end, and further N,N'-bis The chiral environment of trifluoromethanesulfonylphosphoramide enables spatial control of polymer stereoselectivity.

Description

Technical field [0001] The present invention relates to the technical field of polymer preparation, and in particular to a method for preparing vinyl ether polymers with high stereoregularity through chiral acid-catalyzed polymerization. Background technique [0002] As a class of mass-produced and low-cost thermoplastic polymers, polyolefins have the advantages of low density, high tensile strength, excellent chemical stability and easy processing and molding. To date, the total production of polyolefins accounts for 55% of the world's total polymer production. However, these hydrocarbons cannot be separated well from other materials, thus greatly limiting their applications in composite materials, surface coatings, adhesives and other high-performance engineering fields. Due to the existence of these problems, research on polar thermoplastic polymers has been promoted in recent years. At present, functional modification of polymers does not fundamentally change the prope...

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Problems solved by technology

Because such methods require stringent reaction conditions and substrate-controlled regioselectivity, harmful side reactions can occur, such as maleic anhydride-modified polypropylene polymers with lower molecular weights and materials than cross-linked polymers. The degree of functionalization is inversely correlated with

The current use of noble metal catalysts and expensive reagents cannot achieve industrial purposes

The limitation of these methods is that the introduction of polar groups can adversely affect the thermodynamic and mechanical properties of polymers and corresponding materials

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