Method for covalence bonding chitosan and base material surface

A substrate surface and covalent bond technology, which is applied in the field of covalently bonded chitosan on the substrate surface, can solve problems such as difficult popularization and application, poor coating stability and durability, and limited interception, and achieve operability Strong, inexpensive, and easy-to-prepare effects

Inactive Publication Date: 2002-07-17
SURFACE & INTERFACE CHEM ENG TECH RES CENT NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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 immobil

Method used

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  • Method for covalence bonding chitosan and base material surface
  • Method for covalence bonding chitosan and base material surface
  • Method for covalence bonding chitosan and base material surface

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Embodiment Construction

[0014] Preparation of azido chitosan (Az-CS) solution: add 1g chitosan powder, 0.48g DCC and 0.05~0.5g 4-azidobenzoic acid to 100mL solvent, then stir at room temperature for 8h, filter, Fully wash with methanol, filter, and vacuum dry to obtain Az-CS. Then it was dissolved in a mixed solvent of 1% dilute acetic acid and ethylene glycol monomethyl ether (80 / 20 V / V) to form a 0.1% Az-CS solution.

[0015] 1. The method of covalently bonding chitosan on the surface of polylactic acid film: fix chitosan on the surface of polylactic acid (PLA) film, cast 0.1% Az-CS solution on the surface of PLA film, in a brown dryer Let it dry, and the film is 10cm away from an 8W ultraviolet lamp, irradiate for 10min, then wash the film with 5% acetic acid, 0.05NaOH solution and water in sequence, and finally vacuum dry.

[0016] 2. The method of covalently bonding chitosan on the surface of polyurethane: fix chitosan on the surface of polyurethane (PU) (the fixation method is the same as 1), and t...

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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 ...

Claims

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Application Information

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IPC IPC(8): C08J7/16C08L5/08
Inventor 沈健朱爱萍林思聪
Owner SURFACE & INTERFACE CHEM ENG TECH RES CENT NANJING UNIV
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