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
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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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