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Negative poisson's ratio material and its preparing method and use

A technology of negative Poisson's ratio materials and plates, applied in chemical instruments and methods, layered products, synthetic resin layered products, etc., can solve problems such as damage tolerances

Inactive Publication Date: 2007-06-27
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Negative poisson's ratio material and its preparing method and use

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Embodiment 1

[0076] Starch 70g, PBS 15g, glycerol 8g, sorbitol 5g, azodicarbonamide 1.5g, N,N'-dimethyl-N,N'-dinitrosoterephthalamide 0.5g, Prepare according to the ratio, extrude and granulate in a screw extruder. Add a certain amount of the above-mentioned particles according to the size of the foam to be prepared, uniformly heat the mold at 110-125°C, and keep the temperature for 8-15 minutes. Then cool down to room temperature and take out the product object, as the middle layer, for subsequent use.

[0077] Put the above-made sheet or plate in another fan-shaped mold, in this mold, fix the foamed sheet or plate in the middle of the mold, add the mixture of the above formula to both sides of the middle layer of sheet or plate Material, quickly heat the mold temperature 130 ~ 135 ℃, so that the foamed particles in the cavity quickly fan-shaped foam. Keep warm for 8-15 minutes, then cool down to room temperature, take out the product, and obtain a material with a negative Poisson's rat...

Embodiment 2

[0079] 85 g of starch, 10 g of glycerol, 3 g of triglyceride, and 2.0 g of azodicarbonamide are extruded and granulated in a screw extruder according to a certain ratio. Add a certain amount of the above-mentioned particles according to the size of the foam to be prepared, uniformly heat the mold at 120-125°C, and keep the temperature for 8-15 minutes. Then cool down to room temperature and take out the product object, as the middle layer, for subsequent use.

[0080] Put the above-made sheet or plate in another fan-shaped mold, in this mold, fix the foamed sheet or plate in the middle of the mold, add the mixture of the above formula to both sides of the middle layer of sheet or plate Material, quickly heat the mold temperature 130 ~ 135 ℃, so that the foamed particles in the cavity quickly fan-shaped foam. Keep warm for 8-15 minutes, then cool down to room temperature, take out the product, and obtain a material with a negative Poisson's ratio. The pore diameter of the micr...

Embodiment 3

[0082] Starch 82g, PBS 15g, glycerol 10g, monoglyceride 5g, N,N'-dimethyl-N,N'-dinitrosoterephthalamide 1.5g, azodicarbonamide 1.5g g. According to a certain ratio, it is extruded in a screw extruder, and directly extruded into shape without granulation.

[0083] The temperature of the four zones of the middle layer and the outer layer screw is 90-120°C respectively, the temperature of the extrusion port is 100°C, the initial temperature of the pressure roller and the mold is also 110°C, and the temperature is controlled.

[0084] The outer layer screw extruded foam is bifurcated, and the outer layer foam is added to both sides of the middle layer screw extruded foam, and rolled by double rollers at a temperature of 120-125°C for 1-3 times.

[0085] The rolled material is added to the fan-shaped mold, and the temperature of the fan-shaped mold is controlled at 130-135°C for directional foam molding. Keep warm for 8-15 minutes, then cool down to room temperature, take out the ...

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Abstract

The present invention relates to composite polymer material, and is especially stretching material with negative Poisson's ratio and its preparation process and use. The foamed material obtained through secondary foaming process or screw extrusion foaming process has microscopic double fan-shaped composite structure with middle layer of regular honeycomb structure, outer layer of ordered gradually lengthened arrangement and micropores of 80-150 micron size. The foamed material has the mechanical performance of perpendicularly expanding while being stretched and perpendicularly contracting while being extruded. By means of special preparation process, the foamed material may have raised compression resistance, shock absorption, rebound elasticity and other mechanical performance. The unique mechanical performance makes the material possess application in composite board, waste water treatment, deep water job and other fields.

Description

technical field [0001] The negative Poisson's ratio material of the invention belongs to the high-performance polymer composite material, and particularly relates to the mechanical properties of the material and the structure model of the material. A negative Poisson's ratio material that can be widely used in the fields of composite boards, wastewater treatment, deep-water operations, aerospace, comfortable fabrics, embedded workpieces, and the like, as well as a preparation method and application of the material. Background technique [0002] Among our common materials, the range of Poisson's ratio is mostly within positive 0 to 0.5, while the Poisson's ratio of most materials is between 0.2 and 0.4. Nevertheless, there are still a few materials with negative Poisson's ratio (negativePoisson's ratio), for example: the Poisson's ratio of single crystal sulfide ore (single crystal pyrite) is -0.14, and the Poisson's ratio of α-cristobalite can also reach -0.5. At the same ...

Claims

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Application Information

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IPC IPC(8): C08L3/02C08L1/02C08L67/02C08L67/04C08L23/06C08L23/12C08L25/06C08K5/23C08J9/00B29C44/16B29C65/48B32B27/00
CPCB29C44/00B29C44/357B29K2105/04B29C44/08
Inventor 潘则林赵萍王才
Owner INST OF CHEM CHINESE ACAD OF SCI
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