A kind of Kevlar nanofiber/regenerated silk fibroin composite film and preparation method thereof
A technology of regenerated silk fibroin and Kevlar fiber, which is applied in the field of Kevlar nanofiber/regenerated silk fibroin composite film and its preparation, which can solve the problem of difficult mixing of Kevlar nanofibers, limited compounding, insufficient mechanical properties, etc. problems, achieve good interfacial compatibility, improve surface activity, and expand the effect of application fields
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Embodiment 1
[0050] Embodiment 1: the preparation of a kind of Kevlar nanofiber / regenerated silk fibroin composite film, such as figure 1 shown.
[0051] Product 1: includes the following steps:
[0052] 1) Cut silkworm cocoons into flakes, degumming, dissolving, centrifuging, dialysis and concentration to obtain a high-concentration regenerated silk fibroin aqueous solution;
[0053] Degumming: Take 15 parts of silkworm cocoons cut into flakes, add them to an aqueous solution of sodium bicarbonate with a bath ratio of 1:50 and a mass fraction of 2 wt%, and boil them in a 2000mL beaker at 100°C 40min and change the aqueous solution 3 times, then fully wash with deionized water at 30°C and dry the cleaned silk in a vacuum drying oven at 45°C for 24h to obtain degummed silkworm cocoons;
[0054] Dissolution and centrifugation: Add the degummed silkworm cocoons into the calcium chloride-absolute ethanol-deionized water ternary dissolution system with a molar ratio of 1:2:8, and stir in a ma...
Embodiment 2
[0090] Example 2: Surface morphology, thickness observation and tensile strength test of Kevlar nanofiber / regenerated silk fibroin composite film
[0091] 1. Experimental materials
[0092] The regenerated silk fibroin film and the Kevlar nanofiber / regenerated silk fibroin composite film prepared under the conditions of product 3 in Example 1.
[0093] 2. Experimental method
[0094] 2.1 Surface morphology and thickness observation
[0095] It was carried out at 25°C, and the US Quant a-250 scanning electron microscope was used to observe the surface morphology and thickness of the Kevlar nanofiber / silk fibroin composite film. The sample was glued to the conductive adhesive and sprayed with gold. Put it in the instrument for observation.
[0096] 2.2 Tensile strength test
[0097] It is carried out under the condition of 25 ℃, and the tensile instrument used is Japan Shimadzu AGS-X electronic universal tensile testing machine. The length of the sample to be tested is 20mm...
Embodiment 3
[0110] Example 3: Comparison of Kevlar nanofiber aqueous dispersion and Kevlar nanofiber / dimethyl sulfoxide dispersion
[0111] 1. Experimental materials
[0112] Kevlar fiber, dimethyl sulfoxide solvent containing saturated potassium hydroxide, mixed acid solution system of concentrated sulfuric acid and nitric acid, polyethylene glycol aqueous solution.
[0113] 2. Experimental method
[0114] 2.1 Pretreatment: Weigh 3 parts of Kevlar fiber, add it to 150 parts of acetone solution, and ultrasonically clean it with an ultrasonic power of 100W for 2 hours, then fully wash it with deionized water at 25°C and clean it well The Kevlar fiber was placed in a vacuum drying oven at a temperature of 60°C for 24 hours to obtain the pretreated Kevlar fiber;
[0115] 2.2 Preparation of Kevlar nanofiber / DMSO dispersion
[0116] Weigh 3 parts of pretreated Kevlar fibers, cut them into 0.5-1cm thin sections, immerse them in dimethyl sulfoxide solvent containing saturated potassium hydrox...
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