Method for covalence bonding chitosan and base material surface

Abstract

The method for covalent linkage of chitosan on surface of base material includes the following steps: bonding nitrine group on the chitosan, casting the triazo-containing chitosan solution on the base material to form chitosan coating layer containing nitrine group, under the irradiation of UV light photolyzing nitrine group into carbene, making carbene ane base material produce insertion reaction to make chitosan chain produce crosslinking reaction so as to make chitosan bond on the surface of base material. The preparation method of triazo-containing chitosan solution includes the following steps: adding chitosan powder, dicyclohexylcarbimide and 4-azidobenzoic acid into organic solvent stirring, filtering, washing with methyl alcohol or dichloromethane, filtering, drying to obtain triazochitosan, then dissolving it in mixed solvent of dilute acetic acid and glycol methyl ether.

Description

1. Technical Field [0001] The invention relates to a method for modifying the surface of a substrate, in particular to a method for covalently bonding chitosan on the surface of the substrate. 2. Background technology [0002] Chitosan is a partially deacetylated derivative of chitin (widely found in the shells of shrimps and crabs). It is D-glucamine linked by β(1→4) and N-acetylglucamine with varying contents A linear polysaccharide arranged irregularly is the only basic polysaccharide in nature. It has both hydrophilic and hydrophobic groups in its molecule, as well as amino and hydroxyl groups that have coordination capabilities and derivatization reactions. These properties determine its wide application value in different fields. [0003] Chitosan also has important application value in water treatment due to its unique biological activity, biocompatibility, good adhesion, strong fiber-forming and film-forming capabilities, and special adsorption properties. It can be used ...

AI Technical Summary

Problems solved by technology

The surface precoating method has poor coating stability and durability, and the effect of chitosan precoating obviously depends on the properties of the substrate surface; while the surface interception method also has poor coating stability and limited interception. defect

These two surface immobilization methods lack chemical bonding, and Methyl4-azidobenzoimidate (MABI) hydrochloride is used to anchor chitosan and substrate, because the synthetic raw materials are rare, the synthetic process is complicated, and the preparation cycle is long, so it is difficult to further popularize and apply

Images