Modified chitosan fiber and polylactic acid composite material and preparation method thereof

A technology of chitosan fiber and composite material, which is applied in the field of preparation of biomedical composite materials, can solve the problems of inability to maintain the fiber shape and destroy the fiber structure, avoid side effects and pollution, have strong interfacial adhesion, and improve the interfacial phase. capacitive effect

Inactive Publication Date: 2010-08-04
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Combining chitosan fibers with polylactic acid and modifying them by traditional chemical methods often fails to maintain the good shape of the fibers and destroys the structure of the fibers

Method used

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  • Modified chitosan fiber and polylactic acid composite material and preparation method thereof
  • Modified chitosan fiber and polylactic acid composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The mass fraction is 0.01%, 0.1%, 0.5% polylactic acid dissolved in the mixed solution of dilute acetic acid and dioxane (volume ratio is 1:9), and the mass fraction of 5% chitosan fiber is put into it Swell, after 10min, add absolute ethanol, take out the chitosan fiber, vacuum dry. The resulting rejection rates were 11.81%, 12.83%, and 12.86%, respectively.

Embodiment 2

[0021] The molecular weight is 2500, 1×10 4 , 1×10 5 Polylactic acid was dissolved in a mixed solution of dilute acetic acid and dioxane (volume ratio 1:9), chitosan fibers with a mass fraction of 5% were put into it for swelling, after 10 min, absolute ethanol was added, and the chitosan fibers were taken out. Sugar fiber, vacuum dried. The resulting rejection rates were 11.81%, 11.70%, and 11.57%, respectively.

Embodiment 3

[0023] The mass fraction is 0.1% polylactic acid is dissolved in the mixed solution (volume ratio is 1:9) of dilute acetic acid and dioxane, the chitosan fiber that mass fraction is 5% is put into it and swells, and time is respectively set at 2min , 5min, 10min, 20min, add absolute ethanol, take out the chitosan fiber, and vacuum dry. The rejection rate is 11.31%, 11.57%, 12.81%, 12.98%.

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Abstract

The invention discloses a preparation method of a modified chitosan fiber and polylactic acid composite material, which comprises the following steps of: (1) mixing a modified chitosan fiber and polylactic acid according to the mixing mass ratio of 5-20:95-80, wherein the viscosity-average molecular weight of the modified chitosan fiber is 2*105-1*106, and the number-average molecular weight of the high-molecular weight polylactic acid is 1*105-3*105; (2) adding the mixture obtained in the step (1) into an injection moulding machine and injecting for moulding for controlling the temperature between 150 DEG C and 210 DEG C and controlling the time between 2 minutes and 20 minutes. The obtained composite material maintains respective favorable performance of the chitosan fiber and the polylactic acid and has good interface compatibility between the chitosan fiber and the polylactic acid and high mechanical strength.

Description

technical field [0001] The invention relates to a preparation method of a biomedical composite material, in particular to a modified chitosan fiber-polylactic acid composite material and a preparation method thereof. Background technique [0002] Polylactic acid has good biological activity and degradability, and has been widely used in the field of biomedicine. However, due to the low mechanical strength, the lactic acid molecules produced after degradation can easily cause local acidity to be too strong, resulting in aseptic infection, which limits its application range. Chitosan is the deacetylation product of chitin, which can be extracted from shrimp and crab shells, and has a wide range of sources and abundant reserves. As the only polysaccharide with positive charge and weak alkaline in nature, chitosan has good biocompatibility and biodegradability. Chitosan and polylactic acid were prepared into a composite material, and chitosan could not only slow down the degra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L5/08B29C45/78D06M15/507D06M101/10
Inventor 周长忍赵秀娟罗丙红焦延鹏
Owner JINAN UNIVERSITY
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