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Bionic negative-Poisson's ratio material and preparation method thereof

A technology of negative Poisson's ratio material and structural material, which is applied in the field of bionic negative Poisson's ratio material and its preparation to achieve the effect of enhancing impact resistance

Inactive Publication Date: 2013-07-24
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, pure centrosomes do not have a negative Poisson's ratio

Method used

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  • Bionic negative-Poisson's ratio material and preparation method thereof
  • Bionic negative-Poisson's ratio material and preparation method thereof
  • Bionic negative-Poisson's ratio material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] See Figure 10 , using laser etching technology to prepare elongated honeycomb micropores on stainless steel plates. The cross-section of the stainless steel plate is designed with numerous elongated honeycomb micropore structures that are divergent outwards layer by layer symmetrically along the central axis; the long axis of the elongated honeycomb micropores on the stainless steel plate, The ratio of the long side to the short side and the wall thickness of the hole are 100 μm, 2 and 0.1 μm, respectively.

[0049] Install the above-mentioned prepared stainless steel template on the front end of the extrusion head of the screw extruder, and then extrude polypropylene through the screw extruder to prepare a porous foam structure material product, that is, to obtain a product with good elasticity and certain compression performance bionic negative Poisson’s ratio material; wherein, the screw temperature of the screw extruder is set as follows: the temperature of the fi...

Embodiment 2

[0052] See Figure 10 , using laser etching technology to prepare elongated honeycomb micropores on aluminum alloy plates. The cross-section of the aluminum alloy plate is designed with numerous elongated honeycomb micropore structures that diverge outward layer by layer symmetrically along the central axis; the length of the elongated honeycomb micropores on the aluminum alloy plate is The ratios of axis, long side and short side are 500 μm and 2 respectively; the wall thickness of the elongated honeycomb micropores: tangential direction is 1 μm, radial direction: the center initial hole wall thickness is 1 μm, the radius increases by 1 mm, the hole wall thickness increases by 0.5 μm.

[0053] Install the aluminum alloy plate prepared above on the front end of the extrusion head of the screw extruder, and then extrude polypropylene through the screw extruder to prepare a porous foam structure material product, that is, to obtain a product with good elasticity and negative po...

Embodiment 3

[0056] See Figure 10 , using laser etching technology to prepare elongated honeycomb micropores on aluminum alloy plates. The cross-section of the aluminum alloy plate is designed with numerous elongated honeycomb micropore structures that diverge outward layer by layer symmetrically along the central axis; the length of the elongated honeycomb micropores on the aluminum alloy plate is The ratios of axis, long side and short side are 400 μm and 1.2 respectively; the wall thickness of the elongated honeycomb micropores: tangential direction is 3 μm, radial direction: the center initial hole wall thickness is 3 μm, and the radius increases by 0.8 mm, the hole wall thickness increases 0.6 μm.

[0057] Install the aluminum alloy plate prepared above on the front end of the extrusion head of the screw extruder, and then extrude polyethylene through the screw extruder to prepare a porous foam structure material product, that is, to obtain a product with a high Young's modulus And...

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Abstract

The invention belongs to a functional polymer foam material, relates to a cell structure, an arrangement mode and mechanical performances of a material, and especially relates to a bionic negative-Poisson's ratio material and a preparation method thereof. The bionic negative-Poisson's ratio material having a special negative Poisson's ratio structure is designed and prepared based on the micro-porous structure of natural foam and a negative Poisson's ratio generation principle in the invention. The bionic negative-Poisson's ratio material is a porous foam structure material prepared by processing a thermoplastic plastic through a screw extruder, pores of the material are elongated honeycomb micro-pores, and the longer axes of the elongated honeycomb micro-pores are dispersedly arranged along a radial direction layer by layer from the central axis to the outside. When the material encounters impact, impact force is rapidly converted to deformation energy because of the bidirectional shrinkage of the negative Poisson's ratio and is absorbed, and simultaneously the density is rapidly increased, so the impact resistance of the material is enhanced.

Description

technical field [0001] The invention belongs to the functional polymer foam material, relates to the cell body structure, arrangement mode and mechanical properties of the material, in particular to a bionic negative Poisson's ratio material and a preparation method thereof. Background technique [0002] Poisson's ratio (v) is a mechanical property of a material. French mathematician Simon Poisson defined it as: the transverse strain of the material (ε x ) and longitudinal strain (ε y ) negative quotient. Formulated [0003] v=-ε x / ε y (1) [0004] According to this definition, in general, most materials we see have a positive Poisson's ratio, because they become thinner laterally when stretched, like stretching an elastic rubber strip, and expand laterally when compressed, like compressing a piece of rubber . However, there are also a small number of negative Poisson's ratio materials, which are now often called auxetic materials. This type of material has a n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/06C08L27/06C08L67/00C08J9/00B29C47/92B29C48/92
CPCB29C48/92B29C44/357B29C2948/92704B29C2948/92895B29K2023/06B29K2023/12B29K2027/06B29K2105/041
Inventor 潘则林赵萍王才王群
Owner INST OF CHEM CHINESE ACAD OF SCI
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