Modified polysaccharide with fluorescent property as well as preparation method and application thereof

Abstract

The invention discloses modified polysaccharide with a fluorescent property as well as a preparation method and an application thereof. Fluorescence groups containing perylene structures are introduced in the acylation process through hydroxyl groups periodically distributed on a macromolecular chain of polysaccharide (starch, glucan, chitosan, chitin, alginic acid, cellulose and cellulose derivatives, so that the function of isolation of the fluorescence groups is achieved, an ACQ (aggregation-caused quenching) phenomenon of perylene type fluorescent molecules is eliminated, and accordingly, low-cost, efficient and practical modified polysaccharide with the fluorescent property is obtained. A fluorescent material prepared from the modified polysaccharide maintains the fluorescence characteristic of perylene light functional groups, has excellent properties of polysaccharide macromolecular materials, can be easily processed and formed, can be manufactured in various forms such as films, fiber, coatings, microspheres, micelle and the like, and has important practical value in fields of films, fiber, coating, ink, dye and the like.

Description

technical field [0001] The invention relates to a polysaccharide-based fluorescent material containing a perylene structure and a preparation method thereof, belonging to the field of organic fluorescent material preparation. Background technique [0002] Perylene and its derivatives are a typical type of aggregation-induced quenching (ACQ) fluorescent molecules. Its extremely low-concentration solution has excellent fluorescence characteristics, while its high-concentration solution and solid state have excellent fluorescence quantum yields. extremely low, and the fluorescence effect is extremely weak or even non-existent, thus limiting the wide application of this type of fluorescent molecules. The most direct way to eliminate the ACQ phenomenon is to "isolate" the molecules with ACQ properties from each other. For example, if the perylene fluorescent molecules are uniformly dispersed in the polymer matrix, the fluorescence can be regained. However, pure physical blending...

AI Technical Summary

Problems solved by technology

However, pure physical blending has some disadvantages. First, it is difficult to achieve uniform dispersion of fluorescent molecules in the polymer matrix; second, small fluorescent molecules still have a certain degree of freedom in the composite material. It is easy to migrate and form larger aggregations, resulting in changes in the fluorescence properties of the material and poor fluorescence stability

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