Method for covalence bonding chitosan and base material surface
A technology of substrate surface and covalent bond, which is applied in the field of covalent bonding of chitosan on the substrate surface, can solve the problems of difficulty in popularization and application, poor coating stability and longevity, limitation of retention, etc., and achieves operable The effect of strong performance, low price and easy preparation
Inactive Publication Date: 2004-07-21
SURFACE & INTERFACE CHEM ENG TECH RES CENT NANJING UNIV
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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 Methy14-azidobenzoimidate (MABI) hydrochloride is used to anchor chitosan and substrates, 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
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[0016] Preparation of azido-chitosan (Az-CS) solution: Add 1 g of chitosan powder, 0.48 g of DCC and 0.05 to 0.5 g of 4-azidobenzoic acid into 100 mL of solvent, then stir at room temperature for 8 h, filter, and use Fully washed with methanol, filtered, and vacuum-dried to obtain Az-CS. It was then 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.
[0017] 1. The method of covalently bonding chitosan on the surface of polylactic acid film: immobilizing chitosan on the surface of polylactic acid (PLA) film, casting 0.1% Az-CS solution on the surface of PLA film, and drying in a brown drier Dry in air, place the film at a distance of 10 cm from an 8W UV lamp, and illuminate for 10 min, then wash the film sequentially with 5% acetic acid, 0.05 NaOH solution and water, and finally dry it in vacuum.
[0018] 2. The method of covalently bonding chitosan on the surface of polyurethane: immobilizing ...
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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 a substrate. 2. Background technology [0002] Chitosan is a partially deacetylated derivative of chitin (widely present in the shell of shrimps and crabs), which is composed of D-glutamine connected by β (1→4) and N-acetylglutamine with varying contents. It is a kind of linear polysaccharide arranged randomly, and it is the only basic polysaccharide in nature. Its molecules have both hydrophilic groups and hydrophobic groups, as well as amino groups and hydroxyl groups with coordination ability and derivatization reaction. These properties determine its wide application value in different fields. [0003] Chitosan also has very important application value in water treatment because of its unique biological activity, biocompatibility, good adhesion, strong fiber and film forming ability and special ...
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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