4results about How to "Excellent shape memory performance" patented technology

This invention provides a carbon dioxide-based 3D printing material, its preparation method, and its application. The carbon dioxide-based 3D printing material is prepared from raw materials comprising specific mass parts of PPC, PLA, and a compatibilizer. The compatibilizer is preferably a terpolymer of carbon dioxide, propylene oxide, and a functional monomer, wherein the functional monomer is selected from allyl glycidyl ether and / or glycidyl methacrylate having epoxy groups. Practical application has shown that the carbon dioxide-based 3D printing material provided by this invention exhibits significant impact resistance, shape memory, and self-healing effects. Its impact strength reaches 15.11 KJ / m according to the GB / T 1843-2008 standard for testing the unnotched impact strength of plastic cantilever beams. 2 The highest value can reach 20.54 KJ / m 2 Meanwhile, this carbon dioxide-based 3D printing material also possesses excellent shape memory properties.

The application discloses a shape memory flexible piezoresistive sensor and a preparation method thereof. The sensor is provided with a shape memory composite conductive pressure sensitive film carrying a microstructure as a pressure sensitive layer, a shape memory polyimide film carrying a microstructure as an electrode layer, and a shape memory polyimide film without carrying a microstructure as a packaging layer. In the electrode layer, a conductive slurry is coated on the surface of the microstructure, and an electrode is drawn out. After the pressure sensitive layer, the electrode layer and the packaging layer are heated and shaped according to the temporary shape of an applied interface, the surface of the microstructure of the pressure sensitive layer is pressed on the surface of the microstructure of the electrode layer, the packaging layer is covered on the pressure sensitive layer, and the edges of the packaging layer and the edges of the electrode layer are bonded to obtain a flexible piezoresistive sensor which is fitted to the applied interface. The deformation of each layer of the sensor does not affect the sensing signal, the sensor has high sensitivity, excellent signal stability and recovery, and has a wide application prospect in the field of piezoresistive sensing.

This invention discloses a method for preparing a polyimide-polysiloxane block copolymer shape memory aerogel, comprising the following steps: (1) preparing a polyamic acid solution; (2) preparing a polyamic acid-polysiloxane block copolymer solution; (3) preparing polyamic acid-polysiloxane block copolymer filaments; (4) preparing an aqueous solution of the polyamic acid-polysiloxane block copolymer; (5) preparing a polyamic acid-polysiloxane block copolymer aerogel; and (6) subjecting the polyamic acid-polysiloxane block copolymer aerogel to an imidization treatment to obtain the polyimide-polysiloxane block copolymer shape memory aerogel. The shape memory aerogel obtained by this invention has the characteristics of low density, high porosity, high deformation temperature, high elongation at break, and excellent shape memory performance.

A method for preparing a membrane based on the dynamic network reconstruction of polyimide gel belongs to the field of functional materials technology. The method involves: dispersing a diamine monomer (fluorine-free) in an aprotic polar solvent under ice-water bath conditions, then slowly adding a dianhydride monomer and stirring for 18-24 hours to obtain a PAA solution; adding a triamine crosslinking agent to the PAA solution, ensuring that the total molar amounts of amino and anhydride functional groups are roughly equal during the addition process; placing the thermosetting PAA gel in an oven and heating it at 120℃-150℃ for 15-30 minutes (the higher the crosslinking agent content, the higher the required temperature and the longer the heating time), until the gel transforms into a solution state, which is then coated onto a glass plate; placing the thermosetting PAA film in a muffle furnace for gradient heating treatment, naturally cooling to room temperature, and then immersing it in 60℃ deionized water to detach the film, obtaining a thermosetting polyimide membrane. The film prepared by this invention exhibits good thermal stability and excellent shape memory performance, maintaining a shape fixation rate of 99.77% and a recovery rate of 99.95% after ten shape memory cycles.