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Polar polymer negative poisson ratio foam material and preparation method thereof

A polar polymer and negative Poisson's ratio technology, applied in the field of polar polymer negative Poisson's ratio foam materials and their preparation, can solve the problems of unfavorable large-scale production, cumbersome preparation process, and low preparation efficiency, and achieve production Low cost, simple process, good anti-notch performance

Active Publication Date: 2019-05-10
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of this, the present invention provides a polar polymer negative Poisson's ratio foam material and a preparation method thereof, which solves the cumbersome preparation process of the negative Poisson's ratio polymer foam material in the prior art, low preparation efficiency, and adverse effects on polymerization. Technical issues that are limited and unfavorable for mass production

Method used

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  • Polar polymer negative poisson ratio foam material and preparation method thereof
  • Polar polymer negative poisson ratio foam material and preparation method thereof
  • Polar polymer negative poisson ratio foam material and preparation method thereof

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preparation example Construction

[0033] The processing condition of preparation method of the present invention:

[0034] The temperature is selected at 80-180°C, because if the temperature is lower than 80°C, the foaming effect of the polymer matrix is ​​not good; if the temperature is higher than 180°C, the melt strength of the polymer matrix is ​​low, and the cells are prone to collapse and rupture. Not conducive to negative Poisson's ratio transitions. The preferred temperature is 90-160°C, more preferably 100-150°C.

[0035] The pressure is selected at 3-25MPa, because the pressure is lower than 3MPa, the cells of the polar polymer foam are larger and the mechanical strength is lower, and when the pressure is higher than 25MPa, the melt strength of the polar polymer resin matrix cannot withstand it. If the pressure is too high, the prepared foam will break holes, which is not conducive to the transformation of negative Poisson's ratio. The saturation pressure is preferably 5 to 16 MPa.

[0036] It tak...

Embodiment 1

[0041] Firstly, chlorinated polypropylene (Shandong Yaxing, CPE, 135A) is made into 60×60×4mm by heating and molding 3 The parts to be foamed are heated and molded at a temperature of 160°C; the parts to be foamed are placed in CO at 145°C and 25MPa 2 and water foaming equipment for 0.5h, and then release the pressure to normal pressure at a pressure release rate of 12MPa / s. During the process of pressure release and foaming, the product to be foamed will be discharged out of the foaming device with the pressure release gas to complete the foaming process. Foam to obtain chlorinated polypropylene foam material with negative Poisson's ratio.

[0042] After testing, the foam material has a cell structure with "concave corners", and the SEM photos are as follows figure 2 Shown; the Poisson's ratio of the material is tested according to the GB / T1040.1-2006 standard, and the Poisson's ratio is -1.1.

Embodiment 2

[0044] First, nylon copolymer resin (French Atofina, PEBAX 1940) is made into 60×60×5mm by injection molding machine 3 The parts to be foamed, the temperature of the injection molding machine is 160°C; the parts to be foamed are placed in 130°C, 12MPa CO 2 and water foaming equipment for 3 hours, and then quickly release the pressure to normal pressure at a pressure release rate of 2MPa / s. During the process of pressure release and foaming, the product to be foamed remains in the foaming equipment to complete foaming, and then Open the foaming device and take it out to obtain a nylon copolymer resin negative Poisson's ratio foam material.

[0045] After testing, the foam material has a cell structure with "concave corners", and the SEM photos are as follows figure 2 As shown; the Poisson's ratio of the material is tested according to the GB / T1040.1-2006 standard, and the Poisson's ratio is -1.3.

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Abstract

The invention relates to a polar polymer negative poisson ratio foam material and a preparation method thereof, and belongs to the technical field of functional polymer foam materials. The method solves the technical problem that a preparation method of a negative poisson ratio foam material is complicated in preparation process, low in preparation efficiency and unfavorable for large-scale production and limits polymers in the prior art. The preparation method is characterized in that polar polymers are directly formed or compounded with auxiliaries and then formed to prepare a workpiece to be foamed, the workpiece to be foamed is placed into a foaming device, physical foaming agents and water are led in, and pressure is rapidly released at the temperature of 80-180 DEG C and under the saturation pressure of 3-25MPa for the saturation pressure of 0.5 hour or more to obtain the foam material. The polar polymer negative poisson ratio foam material can be prepared by one step, the methodis simple in preparation technology, high in preparation efficiency and safety, green, environmentally friendly and suitable for large-scale production, the water is used for assisting in preparation, and the negative poisson ratio foam material with a large size can be prepared.

Description

technical field [0001] The invention belongs to the technical field of functional polymer foam materials, and in particular relates to a polar polymer negative Poisson's ratio foam material and a preparation method thereof. Background technique [0002] Poisson's ratio (ν) is a mechanical property of a material. French mathematician Simon Poisson defined it as: the material transverse shrinkage strain (ε x ) and longitudinal elongation strain (ε y ) ratio, which is an important parameter to reflect the properties of materials. The formula is as follows: [0003] ν=-ε x / ε y [0004] Most materials have a positive Poisson's ratio, such as rubber materials, which contract laterally when stretched and expand laterally when compressed. However, there are also a small number of negative Poisson's ratio materials, also known as auxetic materials. Natural negative Poisson's ratio materials include pyrite, cat skin, etc. Artificial negative Poisson's ratio materials include...

Claims

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Application Information

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IPC IPC(8): C08J9/12C08L23/28C08L77/00C08L23/08C08L23/12C08L71/02C08L75/04C08L55/02
Inventor 唐涛李明罡樊东蕾邱健姜治伟
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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