A kind of multicolor fluorescent hyperbranched polyurethane and preparation method thereof

Abstract

The present invention relates to a kind of polychromatic fluorescent hyperbranched polyurethane and preparation method, in N 2 Under protection, triethyl citrate and diethanolamine are prepared in a certain molar ratio by a mild and simple transesterification polycondensation reaction "one-pot method". Add catalyst 4-dimethylaminopyridine to react, then dissolve in CH 2 Cl 2 , precipitated in ethanol, filtered, and dried to obtain hyperbranched polyurethane. The hyperbranched polyurethane synthesized by this method can not only emit blue, green and red fluorescence with different excitation wavelengths, but also has a number-average molecular weight of more than 100,000, and can form uniform The spherical self-assembled body has a stable structure. In addition, the synthesized hyperbranched polyurethane is non-toxic, has good biodegradability and high fluorescence intensity, so it has very potential application prospects in the fields of cell imaging, drug delivery and ion detection. In addition, the synthesis method has the advantages of simple process, controllable process, environmental friendliness, etc., and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of polymer luminescent materials, and relates to a multicolor fluorescent hyperbranched polyurethane and a preparation method thereof. Background technique [0002] In recent years, light-emitting polymers that do not contain conjugated π-electron structural units such as benzene rings and thiophenes have attracted more and more attention from scientists. The structure of this new type of light-emitting polymer generally only contains non-conjugated groups such as tertiary amine, amide, ester group, carbonyl group, cyano group or carbon-carbon double bond; therefore, they are environmentally friendly and have good biocompatibility, etc. advantage. These polymers can emit bright blue fluorescence under certain conditions, so they have a wide range of applications in the fields of cell fluorescence imaging, gene labeling and drug controlled release. However, at present, there are common problems of complex synthesis m...

AI Technical Summary

Problems solved by technology

However, the molecular weight of the hyperbranched polyurethane prepared by this esterification reaction is low, and the citric acid molecule is also prone to esterification reaction between molecules due to the presence of carboxyl and hydroxyl groups, resulting in more by-products and inhibiting the production of citric acid. Esterification with diols

In addition, the water produced by this reaction will hydrolyze the generated hyperbranched polyurethane, and the stability of the system is relatively poor.

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