31results about How to "Has shape memory properties" patented technology

The present invention relates to a high-damping marmem. In the original marmem Ti-Ni-Cu the trace rare earth element Y is contained, the content of Y is 0.01-5 at%. Said invented high-damping alloy utilizes the regulation of content of constituent element Cu and Y can raise and control martensific phase transformation temperature of the alloy so as to obtain high-damping alloy with wider working temperature range. Said invented high-damping alloy can be smelted by adopting vacuum induction smelting process or electric arc process, can be directly prepared into the antivibration component product. Said invented high-damping marmem has excellent damping performance, wider application range, lower cost and excellent antifriction, wear-resisting and corrosion-proofing properties.

Provided are an electroshape memory composite material, a preparation method and applications. Styrene-isoprene-styrene segmented copolymers and low-density polyethylene (SIS / LDPE) with a weight ratio of 60:40-80:20 are subjected to radiation crosslinking, a polymer matrix is prepared, then graphite with a mass fraction of 6%-30% of the polymer matrix is added, and the mixture is blended. The invention also comprises a preparation method for an electrographite / SIS / LDPE composite material and applications. The electrographite / SIS / LDPE composite material has an electroshape memory characteristic. Experiments prove that when the graphite content is higher than 6%, the graphite / SIS / LDPE composite material has a good electroshape memory characteristic. In addition, under action of a certain voltage, the deformation reversion rate can reach 100%, the response time decreases along with increase of the graphite content, and the response time of a sample is shortened along with increase of the voltage. In addition, electrocirculation shape memory tests for many times show that the deformation reversion rates are all higher than 95%.

The invention relates to a method for manufacturing fibers with a memory function. The method includes the steps of core spinning solution manufacturing, shell spinning solution manufacturing and solution spinning. According to the method, by preparing spinning solutions modified by skin and cores respectively, it can be guaranteed that residual stress hardly exists in tows after drafting and heat setting, and the tows are unwound smoothly. More importantly, a fiber product which is stable in structural performance, good in fiber mechanical performance and lower in fiber modulus and has the shape memory characteristic is manufactured.

The invention discloses a two-way linear driver based on a shape memory material actuator and belongs to a linear driver technique. A stator and an end cover are respectively and fixedly arranged at the two end parts of a shell through a stator installation bolt and an end-cover installation bolt, a rotor is configured in the shell, the two side parts of the rotor are respectively inserted in the central holes of the stator and the end cover, an S-shaped shape memory polymer composite material actuator is configured in a central inner hole on one side of the rotor, the two ends of the S-shaped shape memory polymer composite material actuator are respectively fixedly connected with the stator and the rotor through a stator bolt and a power bolt, and the two ends of a shape memory alloy tension spring are respectively connected with the stator and the rotor. The driver disclosed by the invention is simple and compact in structure, large in drive output displacement, reliable in use, easy to operate and controllable in displacement, and can be used for achieving an effect of two-way linear drive.

The invention provides thermally reversible crosslinked polyurethane containing dicyclopentadiene crosslinking bridged bonds, and a preparation method and applications thereof. Dicyclopentadiene dicarboxylic acid and polyisocyanate (I) carry out reactions to generate a terminal isocyanate component, which contains a dicyclopentadiene structure and is taken as a crosslinking agent, and the terminalisocyanate component and a terminal hydroxyl component carry out reactions to form a crosslinked polyurethane network. By introducing dicyclopentadiene bridged bonds into polyurethane, at a high temperature, bridged bonds are broken; at a low temperature, bridged bonds are formed again; and repeated processing of chemical crosslinking type polyurethane is realized. The primary reverse Diels-Alderreaction temperature of dicyclopentadiene bridged bonds is 170 DEG C; and dicyclopentadiene bridged bonds are introduced into polyurethane to realized thermoplastic processing of crosslinking type polyurethane in a temperature range of 170 to 210 DEG C. The prepared thermally reversible polyurethane has an excellent repeated processing property, and still has good mechanical properties after manytimes of processing and moulding.

The invention discloses a gas separation membrane having a shape memory property; the gas separation membrane is prepared by the steps: firstly, forming a copolymerized linear oligomer from dianhydride 4,4'-(hexafluoroisopropylidene)diphthalic anhydride, diamine 4,4'-diaminodiphenyl ether and 2-(4-aminophenyl)-5-aminobenzoxazole, then carrying out a reaction of the copolymerized linear oligomer with 2,4,6-triaminopyrimidine gradually to form hyperbranched macromolecules, and finally, carrying out thermal imidization to obtain a hyperbranched polyimide membrane. The hyperbranched polyimide membrane has large specific surface area and can achieve gas adsorption; by adjusting the stiffness and flexibility of a structure of polyimide, the hyperbranched polyimide membrane has different adsorption characteristics on different gases, so as to achieve gas separation characteristics. In addition, the hyperbranched polyimide has obvious glass transition temperature, the transition can be used as a shape memory reversible phase, mutual entanglement of macromolecular chains and intermolecular strong interaction force in the polyimide structure can be used as a stationary phase, and thus the hyperbranched polyimide is endowed with the shape memory property.