Polyvinyl alcohol/polyoxyethylene synergistic enhanced chitin material and production method and purpose thereof

A technology of polyethylene oxide and polyvinyl alcohol, which is applied in the field of biomaterials, can solve problems such as poor solubility and mechanical properties, and achieve the effects of improving mechanical properties, wide application prospects, and large adjustability

Active Publication Date: 2017-09-15
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the defects of poor solubility and related mechanical properties of chitin, the primary purpose of the present invention is to provide a preparation method of polyvinyl alcohol / polyoxyethylene synergistically reinforced chitin material, which dissolves chitin with NaOH / urea aqueous solution system A new type of enhanced water-soluble polymer chitin was prepared by co-dissolving polyethylene oxide (Polyoxyethylene PEO), polyvinyl alcohol (Polyvinyl alcoholPVA) and chitin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for preparing a reinforced chitin material, comprising the following steps:

[0026] Add 2 grams of chitin, 0.02 grams of polyethylene oxide and 0.02 grams of polyvinyl alcohol into 100 g of a mixed aqueous solution containing 11wt% NaOH and 4wt% urea, stir evenly, freeze at -70°C for 12 hours, and then thaw at room temperature , a clear chitin solution was obtained after centrifugal defoaming. Cast the chitin solution on a glass plate, solidify in an oven at 60°C for 24 hours to form a transparent gel wet material, soak it in 1% HCl for 5 minutes, and remove the residual sodium hydroxide and urea in the material with deionized water to obtain The flexible wet chitin-PEO / PVA material has a tensile strength of 2.7MPa and an elongation at break of 68%. The wet material was heated under pressure to obtain a dry transparent chitin-PEO / PVA material with a tensile strength of 52.4 MPa, an elongation at break of 10.6%, and a bending strength of 79.6 MPa.

Embodiment 2

[0028] A method for preparing a reinforced chitin material, comprising the following steps:

[0029] Add 2 grams of chitin to 100 g of a mixed aqueous solution containing 11wt% NaOH and 4wt% urea, stir evenly and freeze at -70°C for 12 hours, then thaw at room temperature, add 0.02 g of polyethylene oxide and 0.02 g of polyethylene The alcohol was frozen-thawed again, and a clear chitin solution was obtained after centrifugation and defoaming. Cast the chitin solution on a glass plate, solidify in an oven at 60°C for 24 hours to form a transparent gel wet material, soak it in 1% HCl for 5 minutes, and remove the residual sodium hydroxide and urea in the material with deionized water to obtain The flexible wet chitin-PEO / PVA material has a tensile strength of 4.6 MPa and an elongation at break of 73%. The wet material was heated under pressure to obtain a dry transparent chitin-PEO / PVA material with a tensile strength of 51.1 MPa, an elongation at break of 9.3%, and a bending ...

Embodiment 3

[0031] A method for preparing a reinforced chitin material, comprising the following steps:

[0032] Add 2 grams of chitin, 0.1 gram of polyethylene oxide and 0.1 gram of polyvinyl alcohol into 100 g of a mixed aqueous solution containing 11wt% NaOH and 4wt% urea, stir evenly, place at -50 for 24 hours, and then thaw at room temperature. Stir evenly, freeze-thaw again, and obtain a clear chitin solution after centrifugation and defoaming. Cast the chitin solution on a glass plate, solidify in an oven at 60°C for 24 hours to form a transparent gel wet material, soak it in 1% HCl for 5 minutes, and remove the residual sodium hydroxide and urea in the material with deionized water to obtain The flexible wet chitin-PEO / PVA material has a tensile strength of 4.8 MPa and an elongation at break of 81%. The wet material is heated under pressure to obtain a transparent dry chitin-PEO / PVA material. Its tensile strength is 58.4MPa, its elongation at break is 15.3%, and its bending stre...

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Abstract

The invention discloses a polyvinyl alcohol / polyoxyethylene synergistic enhanced chitin material and a production method and a purpose thereof. The method comprises the following steps: adding chitin in a solution containing NaOH and urea, adding polyoxyethylene and polyvinyl alcohol, dissolving the raw materials through a refrigeration-unfreezing process to obtain a chitin solution; centrifuging the solution and defoaming the solution, casting the chitin solution and gelating the chitin solution to form a membrane, using a dilute acid solution to immerse the material for several minutes, using water for flushing to remove the residual sodium hydroxide and urea in the membrane to obtain a chitin moisture membrane; and pressurizing the chitin moisture membrane and heating the material to obtain the enhanced dried chitin membrane. In the invention, an application of PEO and PVA is capable of increasing the mechanical properties (comprising tensile strength and bending strength) of the chitin material, and effectively improves the brittleness of the material.

Description

technical field [0001] The invention belongs to the field of biological materials, and in particular relates to a polyvinyl alcohol / polyoxyethylene synergistically reinforced chitin material, a preparation method and application thereof. Background technique [0002] Chitin is a natural polymer with a content second only to cellulose in nature. It has good biocompatibility, biodegradability, immune regulation, wound healing, bone repair and antithrombotic properties. It is used in biomedical materials, food Addition and packaging, water treatment and other fields have potential application prospects. Chitin has high crystallinity, contains a large number of intramolecular and intermolecular hydrogen bonds, is insoluble in water and most organic solvents and has a melting point higher than the decomposition temperature, and poor processability, which limits the application of chitin. [0003] At present, some special methods are used to prepare chitin, such as solvent dissol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/08C08L29/04C08L71/02C08J5/18C08J3/03C08J3/075
CPCC08J3/03C08J3/075C08J5/18C08J2305/08C08J2429/04C08J2471/02C08L5/08C08L2203/16C08L2205/03C08L29/04C08L71/02
Inventor 周长忍钟声亮周霖焦延鹏
Owner JINAN UNIVERSITY
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