RAFT (Reversible Addition-Fragmentation chain Transfer) reaction reagent based on low molecular weight carbon dioxide copolymer and preparation method of RAFT reaction reagent

Abstract

The invention provides an RAFT (Reversible Addition-Fragmentation chain Transfer) reaction reagent based on a low molecular weight carbon dioxide copolymer and a preparation method of the RAFT reaction reagent, wherein the RAFT reaction reagent is a dithioester end capped low molecular weight carbon dioxide copolymer. The preparation method comprises the following steps of: subjecting a low molecular weight carbon dioxide polymerization product with terminal hydroxyl and halogen acyl halide to reaction at low temperature through a molecular design by utilizing a low molecular weight product generated through polymerization reaction between carbon dioxide and an epoxy compound, and separating and purifying a product to obtain halogen atom end capped low molecular weight carbon dioxide copolymer resin; and dissolving a halogen atom end capped low molecular weight carbon dioxide copolymer into a dichloromethane solution, adding alkyl xanthate at the room temperature, and reacting to finally obtain the RAFT reaction reagent based on the low molecular weight carbon dioxide copolymer. By using the RAFT reaction reagent, the low molecular weight carbon dioxide copolymer can be effectively utilized, and the emission of carbon dioxide as greenhouse gas can be reduced; and the preparation method and process are simple and easy to control.

Description

【Technical field】 [0001] The invention relates to a RAFT reaction reagent based on a low molecular weight carbon dioxide copolymer and a preparation method thereof. 【Background technique】 [0002] Carbon dioxide copolymer represented by the copolymerization of carbon dioxide and epoxy compounds is a cheap synthetic biodegradable material, which has the value of large-scale production and is expected to be applied in biomedical materials and food packaging materials. Among them, the application of low-molecular-weight carbon dioxide copolymer resin has attracted attention: the Chinese patent application number 02134631 discloses a method for synthesizing aliphatic polycarbonate polyurethane foam materials with carbon dioxide as the starting material; the Chinese patent application number 201010224108.0 The patent discloses a polycarboxylic acid-based water reducer containing a low-molecular-weight carbon dioxide copolymer and its synthesis method; the Chinese patent with appl...

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Problems solved by technology

[0003] On the other hand, the RAFT reaction, that is, the reversible addition-fragmentation chain transfer radical polymerization reaction, is widely used in the molecular design and controllable construction of multi-component block polymers, and is suitable for the reversible addition-fragmentation chains of different polymerization reaction monomers. Reagents for transfer radical polymerization have been intensively studied and are becoming increasingly mature, but the development and preparation methods of reversible addition-fragmentation chain transfer radical polymerization reagents based on low molecular weight carbon dioxide copolymers have not been reported yet.

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