▎ 摘　　要

NOVELTY - Pullulan shape memory material comprises 15-25 pts. wt. high-molecular-weight pullulan polysaccharide, 1-5 pts. wt. polyvinyl alcohol, 0.1-1.1 pts. wt. cross-linking agent, 1-5 pts. wt. an auxiliary agent and 75-85 pts. wt. water. USE - Pullulan shape memory material used in sensors, intelligent robots, drug release, minimally invasive implantation, medical dressings and intelligent textiles (claimed). ADVANTAGE - The pullulan polysaccharide shape memory material has high elongation, so it has high deformation ability, can be fixed into shape under the dry condition, and quickly recover its original shape under wet condition, and has high degree of deformation and shape memory performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: 1. A method for preparing pullulan shape memory material, which involves dissolving high molecular weight pullulan polysaccharide in a polyvinyl alcohol aqueous solution, and stirring until the high molecular weight pullulan polysaccharide is completely dissolved, adjusting the pH value to 7.5-8.5, adding a cross-linking agent, and reacting to obtain a cross-linked pullulan solution, adding an auxiliary agent into a pullulan solution to obtain a mixture serving as wet spinning stock solution or a 3D (three-dimensional) printing ink material, carrying out wet spinning on the prepared wet spinning stock solution to obtain pullulan wet spinning fibers, importing the image file into 3D printing equipment, adding the prepared 3D printing ink material into a printer cylinder, and performing 3D printing to obtain a 4D printing precursor and carrying out mechanical deformation operation on the obtained wet-spun fiber or 4D printing precursor, drying and fixing the shape to obtain the product. 2. The pullulan shape memory material of claim 1, and fibers and 4D (four-dimensional) printed products made therefrom, as a solvent-responsive smart material or in the preparation of a solvent-responsive smart material.