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Elastic shape memory material with shear thickening performance, and preparation method and applications thereof

A memory material and elastic technology, applied in the field of intelligent material manufacturing and application, can solve the problems of easy deformation, increased wearing comfort, inability to fix the shape and fit, etc., to achieve excellent impact resistance and increase the scope of application.

Pending Publication Date: 2018-08-21
NANJING SKY LONG PHARMA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The two materials are very similar. They are extremely soft and loose in a static state, and are easily deformed, so they cannot be fixed to fit the shape, such as the shape of the human body.
But if shear thickening materials can be combined with elastic shape memory materials to have the ability to fix temporary shapes, the fit will be better and the wearing comfort will also increase.

Method used

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  • Elastic shape memory material with shear thickening performance, and preparation method and applications thereof
  • Elastic shape memory material with shear thickening performance, and preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0025] 1. Two-component heat-curing silicone (resin and curing agent) and thermoplastic polyurethane (TPU) are used for the elastic shape memory polymer. The weight part of the silicone is 50, and the weight part of the thermoplastic polyurethane is 30; the shear thickening material is D3O material , parts by weight are 20.

[0026] 2. Add thermoplastic polyurethane and shear thickening material into the silicone resin, heat until the mixture melts, and stir evenly.

[0027] 3. Add the curing agent and continue to stir evenly.

[0028] 4. Complete the curing according to the curing conditions provided by the silica gel manufacturer, and the obtained mixture of silica gel, thermoplastic polyurethane and shear thickening material is the target material;

[0029] 5. The elastic modulus of this mixed material is 0.01MPa and the shear modulus is 0.01 MPa under static or slow external load; under the action of instantaneous impact load, the elastic modulus is 0.1 GPa and the shear ...

Embodiment 1-2

[0031] 1. The elastic shape memory polymer is made of two-component heat-curing silica gel (resin and curing agent) and polycaprolactone (PCL), wherein the weight percentage of silica gel is 45, and the weight percentage of polycaprolactone is 25; shear thickening The material is P4U material, and the parts by weight are 30.

[0032] 2. Add the polycaprolactone and the shear thickening material into the silicone resin, and heat to a temperature higher than the melting point of the polycaprolactone and the shear thickening material, and stir evenly.

[0033] 3. After cooling, add curing agent and stir evenly with a mixer.

[0034] 4. According to the curing conditions provided by the manufacturer, cure the silica gel to obtain the target material;

[0035] 5. The elastic modulus of this mixed material is 0.05 MPa and the shear modulus is 0.04 MPa under static or slow external load; under the action of instantaneous impact load, the elastic modulus is 0.5 GPa and the shear modu...

Embodiment 1-3

[0037] 1. The elastic shape memory polymer is thermoplastic polyurethane (TPU), its melting point is 120°C, and the number of parts by weight is 60; the shear thickening material is D3O mixed with 20% by weight of polyethylene glycol powder, the number of parts by weight is 40;

[0038] 2. Heat the thermoplastic polyurethane above the melting point temperature, and add shear thickening material;

[0039] 3. Stir the mixture of thermoplastic polyurethane and shear thickening material evenly with a mixer above the melting point temperature;

[0040] 4. Cool until the material is hardened to obtain the target material.

[0041] 5. The elastic modulus of this mixed material is 0.1 MPa under static or slow external load, and the shear modulus is 0.08 MPa; under the action of instantaneous impact load, the elastic modulus is 1 GPa, and the shear modulus is 1.5 GPa.

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Abstract

The invention belongs to the field of smart material manufacturing and application, and relates to an elastic shape memory material with shear thickening performance, and a preparation method and applications thereof. The elastic shape memory material with shear thickening performance comprises, by weight, 10 to 95 parts of an elastic shape memory polymer material, and 5 to 90 parts of a shear thickening material; the elastic shape memory polymer material and the shear thickening material are combined to form an integral body through blending or combination; the elastic shape memory polymer material is capable of providing an obtained material with elasticity and thermal driving shape memory characteristics; and the shear thickening material is capable of providing the obtained material with shear thickening characteristics. According to the preparation method, the shear thickening material and the elastic shape memory polymer material are combined, so that the obtained elastic shape memory material is capable of adapting different structure shapes through heating deformation, the suitable range is widened, and excellent impact resistance and anticollision performance are achieved.

Description

technical field [0001] The invention belongs to the field of intelligent material manufacture and application, and relates to an elastic shape memory material with shear thickening performance, a preparation method and application thereof. Background technique [0002] Shear thickening, also known as dilation, refers to the non-Newtonian fluid behavior in which the viscosity of a material system increases with an increase in shear rate or shear stress. Shear thickening material refers to a material with shear thickening properties. This kind of material shows a very loose and soft state under slow stress loading, and is easily deformed. However, when subjected to instantaneous and severe external force loading, the molecules of the material are immediately locked to each other, and the hardness increases, thereby improving its ability to resist instantaneous external forces. The typical shear thickening material currently on the market is D3O material, which was invented b...

Claims

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Application Information

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IPC IPC(8): C08L83/04C08L75/04C08L101/12C08L67/04C08L71/02C08L23/08C08L9/06C08L69/00C08L23/16C08L23/06C08L21/00
CPCC08L9/06C08L21/00C08L23/06C08L23/0853C08L23/16C08L67/04C08L69/00C08L75/04C08L83/04C08L2201/12C08L2205/03C08L101/12C08L71/02
Inventor 王韬熹魏民黄为民张华军
Owner NANJING SKY LONG PHARMA
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