Circular polymer and preparation method thereof

Abstract

The invention relates to a circular polymer and a preparation method thereof. The active anion polymerizing and end-capping techniques and the ring-opening polymerization (ROP) are adopted to synthesize a linear polymer with hydroxyls at both ends; sodium hydride (NaH) and propine bromide are adopted to modify chain-end hydroxyls into propargyls; the ROP is adopted to synthesize a linear polymer which is polycaprolactone (PCL) with hydroxyls at both ends; the propiolic acid is adopted to modify chain-end hydroxyls into propargyls; the atom transfer radical polymerization (ATRP) is adopted to synthesize linear polymer with bromine-based group at two ends; the nitrogen-oxygen free radical compound containing propargyls is adopted to modify chain-end bromine-based groups into propargyls; and the Glaser coupling reaction of the propargyls is adopted to synthesize the circular polymer in the presence of cuprous bromide (CuBr) and N, N, N', N'' and N''-pentamethyl diethylenetriamine (PMDETA).

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a ring polymer and a preparation method thereof. technical background [0002] In the field of polymer science, the research on the relationship between the structure and properties of polymer materials is an eternal subject. Following Pederson et al. ( J Am Chem Soc 1967, 89: 2495-2496. J Am Chem Soc 1967, 89: 7017-7036.) Since the synthesis of crown ethers and their complexation with metal ions was first reported in 1967, the synthesis and performance research of ring-structured polymers has aroused great interest and attention in recent years ( Chem. Soc. Rev. 2009, 38 , 2202–2213.). The ring structure has very high stability and equality. Various models of the ring structure can be found in nature, and biologists have also found that there are various ring topology DNAs in the living body, etc. ( Cell. Mol. Life Sci. 2009, 66 , 2599–2602.). ...

AI Technical Summary

Problems solved by technology

However, the most critical problem is the synthesis of a relatively large amount of cyclic polymers, and it is this bottleneck problem that limits the performance research and application exploration of cyclic polymers.

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