Method for synthesizing polyacrylonitrile by Lewis base

Abstract

The invention belongs to the field of synthesis of a high molecular material and particularly relates to a method for synthesizing polyacrylonitrile by a Lewis base. The method is characterized by comprising the following steps of: under the protection of nitrogen gas, mixing 1,4-N,N-dimethylamino pyridine DMAP and dimethylamino pyridine DMSO to prepare a solution; then adding acrylonitrile into the solution to carry out polymerization reaction; reacting at a polymerization temperature of 0-60 DEG C for 1-48 hours, wherein the mass ratio of the dimethylamino pyridine to an acrylonitrile monomer is (7-500): 100; and the mass ratio of the 1,4-N,N-dimethylamino pyridine DMAP to the acrylonitrile monomer is (1.5-25): 100. The method has the beneficial effects that: an anion polymerization condition of the system is moderate and the acrylonitrile can be polymerized at a room temperature and a normal pressure; less side reaction exists and a product is pure; the control on the composition, the molecular weight and the distribution of a polymer is realized; and the polyacrylonitrile has a wide application prospect in the fields of polyacrylonitrile fibers, carbon fiber precursor materials, porous carbon material precursors and the like.

Description

technical field [0001] The invention belongs to the field of synthesis of polymer materials, and in particular relates to a synthesis method of polyacrylonitrile. Background technique [0002] Polyacrylonitrile (PAN) is mainly used to manufacture synthetic fibers, and can also be used as a carbon fiber precursor material and a porous carbon material precursor. As one of the most important man-made fibers, it ranks third in importance after polyester and nylon. Research on polyacrylonitrile fibers began in the 1930s. In 1931, Rain of Farben, Germany produced polyacrylonitrile (PAN) for the first time. In the 1940s, it was first industrialized by DuPont. In the 1950s, the industry matured rapidly. Polyacrylonitrile fiber has excellent weather resistance, sun resistance and chemical resistance, good bulkiness, good warmth retention, soft hand feeling, and is often used to replace some wool to make fabrics. [0003] Compared with polypropylene fiber, polyacrylonitrile fiber...

AI Technical Summary

Problems solved by technology

However, this synthesis method must use a transition metal catalyst. Because the activity of the catalytic system is not high, the amount of the catalyst is relatively large, resulting in more residues in the polymerization product, which are not easy to remove.

And the cost required by atom transfer radical polymerization is relatively high, which limits industrial production

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