Flexible and smart wood with responsive function, preparation method thereof and actuator

A preparation method of a flexible wood with responsive function, comprising the following steps:

• step 1, preparing acetic acid-sodium acetate buffer solution, and dissolving sodium chlorite in the acetic acid-sodium acetate buffer solution to obtain solution A;
• step 2, cutting wood into a wood chip, and soaking the wood chip in the solution A to perform a delignification treatment on the wood chip, thereby obtaining a lignin-removed wood chip;
• step 3, performing an alkali treatment on the lignin-removed wood chip obtained in the step 2 to remove hemicellulose contained in the wood chip, thereby obtaining an alkali-treated wood chip;
• step 4, impregnating an azobenzene compound into the alkali-treated wood chip by means of a negative pressure method to obtain an azobenzene-impregnated wood chip;
• and
• step 5, densifying the azobenzene-impregnated wood chip obtained in the step 4 into a wood film to obtain the flexible wood with responsive function;
• wherein in the step 3, the alkali treatment comprises:
• placing the lignin-removed wood chip in sodium hydroxide (NaOH) solution with a mass fraction of 4%, and then soaking the lignin-removed wood chip in the NaOH solution for 3-6 hours (h);
• and
• wherein in the step 4, the negative pressure method comprises:
• immersing the alkali-treated wood chip in a container filled with solution of the azobenzene compound, and then performing a negative pressure treatment on the alkali-treated wood chip for 1 h at a negative pressure of −0.1 megapascals (MPa) to −0.08 MPa.