CN103009540B - Metamaterial substrate based on controllable dielectric constant and preparation method of substrate - Google Patents
Metamaterial substrate based on controllable dielectric constant and preparation method of substrate Download PDFInfo
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- CN103009540B CN103009540B CN201110298164.3A CN201110298164A CN103009540B CN 103009540 B CN103009540 B CN 103009540B CN 201110298164 A CN201110298164 A CN 201110298164A CN 103009540 B CN103009540 B CN 103009540B
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Abstract
The invention provides a metamaterial substrate based on a controllable dielectric constant and a preparation method of the substrate. A micropore-containing metamaterial substrate is manufactured by utilizing a micro-fine foamed injection molding process, and the density and dielectric constant of the substrate are reduced through the introduced air; a thermoplastic polymer serves as a main material for the substrate, and compared with a hard ceramic material, the substrate is light in weight, small in dielectric constant, low in loss and wide in application field; and moreover, according to the micro-fine foamed injection molding process, the dielectric constant of the substrate can be finely controlled, and the substrate has significance for realizing a graded index metamaterial and converting the metamaterial with reasonable design into a realistic product.
Description
[technical field]
The present invention relates to Meta Materials field, particularly relate to a kind of metamaterial substrate controlled based on dielectric constant and preparation method thereof.
[background technology]
Meta Materials refers to some artificial composite structures with the extraordinary physical property not available for natural material or composite.By the structurally ordered design on the key physical yardstick of material, the restriction of some apparent natural law can be broken through, thus maybe must exceed the meta-materials function of the intrinsic common character of nature.The character of Meta Materials and function mainly come from the structure of its inside but not form their material, and be therefore design and synthesis Meta Materials, people have carried out a lot of research work.2000, the people such as the Smith of University of California pointed out that the metal wire of periodic arrangement and the composite construction of open loop resonator (SRR) can realize permittivity ε and magnetic conductivity μ is negative two negative material simultaneously, also claim LHM.They are again by achieving the two negative material of two dimension at printed circuit board (PCB) (PCB) upper making metal wire and SRR composite construction afterwards.The realization of current metamaterial structure is main or complete to make metal wire on pcb board, traditional PCB substrate dielectric constant is higher, loss is comparatively large, and the tetrafluoroethene substrate dielectric constant that on market, dielectric constant is minimum is general also higher than 2.5, cannot meet the requirement of part high request Meta Materials design.
[summary of the invention]
Technical problem to be solved by this invention is: provide a kind of metamaterial substrate controlled based on dielectric constant and preparation method thereof, replace most of tangible media with micropore, reduces the dielectric constant of substrate by introducing air; And utilize micro foaming injection technique accurately can control the dielectric constant of made substrate.
The technical scheme that the present invention realizes goal of the invention employing is that a kind of preparation method of the metamaterial substrate controlled based on dielectric constant, is characterized in that: described preparation method comprises the following steps:
A, the supercritical fluid of a certain amount of air is dissolved in melt of thermoplastic polymers forms single-phase melt;
B, be injected in the lower mold cavity of temperature and pressure, due to the unstability of the reduction trigger molecule of temperature and pressure, thus form a large amount of gas core in a substrate;
C, the gas core formed are grown up generation micropore gradually.
The supercritical fluid of described air is CO
2supercritical fluid.
The supercritical fluid of described air is N
2supercritical fluid.
The porosity rate of made substrate is controlled by the injection ratio controlling air supercritical fluid.
Described thermoplastic polymer be polyethylene, polypropylene, polystyrene or polyvinyl chloride any one.
The metamaterial substrate that dielectric constant is controlled, is characterized in that: the metamaterial substrate be made up of thermoplastic polymer is the controlled porous substrate of dielectric constant.
Described thermoplastic polymer be polyethylene, polypropylene, polystyrene or polyvinyl chloride any one.
Principle is: micro foaming injection technique: adopt CO
2or N
2supercritical fluid as blowing agent, be first supercritical fluid (carbon dioxide or nitrogen) is dissolved in hot melt adhesive form single phase solution; Then penetrate the lower mold cavity of people's temperature and pressure by switching regulator nozzle, reduce the unstability of trigger molecule thus in goods, form a large amount of nuclei of bubbles due to temperature and pressure, these nuclei of bubbles are grown up gradually and are generated small hole.
The invention has the beneficial effects as follows, utilizing micro foaming injection technique to make metamaterial substrate containing micropore, reducing density and the dielectric constant of substrate by introducing air; The material that uses thermoplastic polymer to be main body is as substrate, and compared with the ceramic material of hard, quality is light, dielectric constant and loss little, application is wide; And micro foaming injection technique accurately can control the dielectric constant of made substrate, to the Meta Materials realizing gradation type, and change the Meta Materials of Theoretical Design into real product and have great meaning.
[accompanying drawing explanation]
Fig. 1 is present invention process principle micro molding process schematic.
[detailed description of the invention]
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Based on a preparation method for the controlled metamaterial substrate of dielectric constant, described preparation method comprises the following steps: as shown in Figure 1,
A, to be dissolved in melt of thermoplastic polymers by the supercritical fluid of a certain amount of air and to form single-phase melt, the supercritical fluid of described air is generally CO
2supercritical fluid or N
2supercritical fluid;
B, be injected in the lower mold cavity of temperature and pressure, due to the unstability of the reduction trigger molecule of temperature and pressure, thus form a large amount of gas core in a substrate;
C, the gas core formed are grown up generation micropore gradually.
Described thermoplastic polymer be polyethylene, polypropylene, polystyrene or polyvinyl chloride any one.
The substrate obtained by above method is the controlled porous substrate of dielectric constant.
Principle is: micro foaming injection technique adopts CO
2or N
2supercritical fluid as blowing agent, be first supercritical fluid (carbon dioxide or nitrogen) is dissolved in hot melt adhesive form single phase solution; Then penetrate the lower mold cavity of people's temperature and pressure by switching regulator nozzle, reduce the unstability of trigger molecule thus in goods, form a large amount of nuclei of bubbles due to temperature and pressure, these nuclei of bubbles are grown up gradually and are generated small hole.
The porosity rate of made base material is controlled by the injection ratio controlling air supercritical fluid; In stepb, the pressure of mold cavity or temperature determine the number of producing gas core, and the change of general temperature can be disregarded, and when the difference of the pressure of single-phase melt and the pressure of mold cavity is larger, the gas nuclear volume formed is also more.
Micro foaming injection technique makes the metamaterial substrate containing micropore, reduces density and the dielectric constant of substrate by introducing air; The material that uses thermoplastic polymer to be main body is as substrate, and compared with the ceramic material of hard, quality is light, dielectric constant and loss little, application is wide; Micro foaming injection technique accurately can control the dielectric constant of made substrate, to the Meta Materials realizing gradation type, and changes the Meta Materials of Theoretical Design into real product and has great meaning.
In the above-described embodiments, only to invention has been exemplary description, but those skilled in the art can carry out various amendment to the present invention without departing from the spirit and scope of the present invention after reading present patent application.
Claims (2)
1., based on a preparation method for the controlled metamaterial substrate of dielectric constant, it is characterized in that: described preparation method comprises the following steps:
A, to be dissolved in melt of thermoplastic polymers by supercritical fluid and to form single-phase melt, described supercritical fluid is CO2 supercritical fluid or N2 supercritical fluid;
B, be injected in the lower mold cavity of temperature and pressure, due to the unstability of the reduction trigger molecule of temperature and pressure, thus form a large amount of gas core in a substrate;
C, the gas core formed are grown up generation micropore gradually;
Wherein, the preparation method of the described metamaterial substrate controlled based on dielectric constant comprises further: the porosity rate being controlled made substrate by the injection ratio controlling supercritical fluid;
Described thermoplastic polymer be polyethylene, polypropylene, polystyrene or polyvinyl chloride any one.
2. the metamaterial substrate that the dielectric constant prepared of method according to claim 1 is controlled, is characterized in that: the metamaterial substrate be made up of thermoplastic polymer is the controlled porous substrate of dielectric constant.
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| CN201110298164.3A CN103009540B (en) | 2011-09-28 | 2011-09-28 | Metamaterial substrate based on controllable dielectric constant and preparation method of substrate |
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|---|---|---|---|
| CN201110298164.3A CN103009540B (en) | 2011-09-28 | 2011-09-28 | Metamaterial substrate based on controllable dielectric constant and preparation method of substrate |
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| CN103009540A CN103009540A (en) | 2013-04-03 |
| CN103009540B true CN103009540B (en) | 2015-03-04 |
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| JP6734914B2 (en) * | 2016-03-09 | 2020-08-05 | 日本碍子株式会社 | Method for manufacturing ceramic molded body |
| TWI673156B (en) | 2017-05-31 | 2019-10-01 | 荷蘭商耐克創新有限合夥公司 | Single-phase solution molding method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5158986A (en) * | 1991-04-05 | 1992-10-27 | Massachusetts Institute Of Technology | Microcellular thermoplastic foamed with supercritical fluid |
| CN1705776A (en) * | 2002-10-18 | 2005-12-07 | 可隆株式会社 | A microcellular foamed fiber, and a process of preparing for the same |
| CN101580599A (en) * | 2009-06-26 | 2009-11-18 | 华东理工大学 | Method for preparing foamed polymer with supercritical fluid |
| CN101786310A (en) * | 2010-01-12 | 2010-07-28 | 华东理工大学 | Method for preparing microporous polysulfones foam material by injection molding of supercritical fluid |
-
2011
- 2011-09-28 CN CN201110298164.3A patent/CN103009540B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5158986A (en) * | 1991-04-05 | 1992-10-27 | Massachusetts Institute Of Technology | Microcellular thermoplastic foamed with supercritical fluid |
| CN1705776A (en) * | 2002-10-18 | 2005-12-07 | 可隆株式会社 | A microcellular foamed fiber, and a process of preparing for the same |
| CN101580599A (en) * | 2009-06-26 | 2009-11-18 | 华东理工大学 | Method for preparing foamed polymer with supercritical fluid |
| CN101786310A (en) * | 2010-01-12 | 2010-07-28 | 华东理工大学 | Method for preparing microporous polysulfones foam material by injection molding of supercritical fluid |
Non-Patent Citations (1)
| Title |
|---|
| "超临界CO2发泡微孔塑料的研究进展";程博等;《中国塑料》;20101231;第24卷(第12期);第14-20页 * |
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