• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A material comprising latex, polypyrrole and a precursor of the nucleation and polymerization of the pyrrole and synthesis process thereof. A material comprising latex and polypyrrole, further comprising a precursor for the nucleation and polymerization of pyrrole, wherein said precursor for the nucleation and polymerization of pyrrole is calcium carbonate. A process for synthesizing the material, comprising (a) adding to latexes additivated with calcium carbonate a precursor of the nucleation and polymerization of pyrrole, wherein said precursor of the nucleation and polymerization of pyrrole is calcium carbonate, (b) adding the resulting material from the previous step to a solution of an oxidant, where said oxidant is ferric chloride, (c) adding pyrrole to the material resulting from the previous step, where all the steps are carried out at a temperature between -2ºC to 30º C. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2664973A1
    申请号:ES201631362
    申请日:2016-10-24
    公开日:2018-04-24
    发明作者:María Del Carmen ALONSO HERR
    申请人:María Del Carmen ALONSO HERR；
    IPC主号:
    专利说明:

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    DESCRIPTION
    TITLE
    A material comprising latex, polypyrrole and a precursor to the nucleation and polymerization of pyrrole and synthesis process thereof.
    FIELD OF THE INVENTION
    The present invention relates to the area of materials, in particular elastic semiconductors, applicable to industrial sectors such as textile, energy, computer, electronic or biomedical. In particular, the present invention relates to a material comprising latex, polypyrrole and a precursor to the nucleation and polymerization of pyrrole and a method of synthesizing said material.
    BACKGROUND OF THE INVENTION
    Currently the search for materials in the field of flexible electronics is booming. These materials are integrated into electronic devices, which may require that certain components be flexible or elastic and that there is electrical current conduction when the device is rolled or elongated.
    One of the important properties of these materials is electrical conductivity. There are elastic materials with high electrical conductivities, such as materials based on metals or graphene, but their synthesis is really expensive.
    Polypyrrole is a conductive polymer, which is an organic compound of electrical conductivity of about 50 S / cm, and which also has the characteristic of being electrostatic and electroactive. In recent years there has been a great interest in this polymer, however due to its poor mechanical properties, there is a need to combine it with another composite material.
    Latex-polypyrrole composites have been described in the state of the art. The use of calcium carbonate in latex-polypyrrole composites has also been described for purposes other than those of the present application.
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    The latex-polypyrrole composites described in the state of the art have properties that have been improved by the solution proposed in the present invention. For example, the electrical conductivity, which in the case of latex-polypyrrole composites described in the state of the art, carried out by chemical oxidation, has electrical conductivities of the order of 10-3 S / cm.
    DESCRIPTION OF THE INVENTION
    According to a first aspect, the present invention provides a material comprising latex and polypyrrole, further comprising a precursor to the nucleation and polymerization of pyrrole, wherein said precursor to the nucleation and polymerization of pyrrole is calcium carbonate.
    Another embodiment is the material according to the first aspect of the invention, wherein said latex and said polypyrrole are configured as layers in the material and the thickness of the polypyrrole layer is between 18 and 28 microns.
    Another embodiment is the material of the first aspect of the invention, where the volumetric ratio latex: polypyrrole is between 60:40 and 40:60.
    The material according to the first aspect of the invention comprises latex coated by polypyrrole. The polypyrrole is obtained by polymerization of the pyrrole. The additivation of the latex with calcium carbonate manages to increase the adhesion and polymerization of the polypyrrole on and between its pores, obtaining conductivities of up to 4 S / cm and maintaining the ability to elastically deform up to 500% of its initial length.
    The material according to the first aspect of the invention can play an important role in its integration into electronic devices in which due to technical requirements it is necessary that certain components be flexible or elastic, since it is capable of conducting the coiled and elongated current. In addition, polypyrrole is electrostatic and electroactive, which opens up a range of possibilities in the field of intelligent materials.
    Combinations of elastomer-polypyrrole materials have been described in the state of the art, but the use of calcium carbonate as a precursor to the nucleation and polymerization of pyrrole has not been described, which results in polyisoprene (or latex) - calcium carbonate composites -polypyrrole. This allows an increase in the thickness of the conductive layer
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    deposited reaching volumetric proportions latex: polypyrrole between 60:40 and 40:60, which are higher than those obtained in the state of the art using the immersion of the latex in a solution of ferric chloride and pyrrole. This volumetric ratio latex: polypyrrole causes higher electrical conductivities than those described in the state of the art, preserving the good properties of the latex: elasticity, flexibility, mechanical resistance. The material is not elastic on the one hand and conductive on the other, but is capable of continuing to conduct the current up to 100% elongation without shedding of polypyrrole. This fact demonstrates the excellent adhesion between the materials integrated in the composite.
    In comparison with the elastomer-polypyrrole composites of the state of the art, the material according to the first aspect of the invention has higher conductivities and deformability, since thanks to calcium carbonate, the polypyrrole penetrates inside the latex and deposits on its surface without the need to mix both materials at high temperatures or introduce intermediate treatments or materials.
    The material according to the first aspect of the invention can be integrated into the electronic devices by replacing the rigid parts with mobile and flexible parts.
    The material according to the first aspect of the invention can be sealed to be isolated from the environment, mainly from oxygen and ambient water.
    In summary, the material according to the first aspect of the invention has the following properties:
    - Semiconductor and electroactive
    - Elastic and flexible: It is able to lengthen and in turn continue to conduct the electric current, although it is true that the electrical resistance increases to elongation, even at 100% elongation conducts the current.
    - Antistatic
    - Economic
    - Easy synthesis
    The material according to the first aspect of the invention could be used in those cases where the electrical requirements are not too high, since it has considerable electrical resistance, but there is a need for it to be flexible or elastic. Even so, it is necessary to highlight the possibility of overlapping several layers of
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    material, thus acting as electrical resistors in parallel, and consequently decreasing the surface resistance of the assembly.
    An example of application of the material according to the first aspect of the invention is in the energy industry, in which the reversibility of the reduction-oxidation reaction of the polypyrrole is used to generate electrical energy as organic supercapacitors or in solar cells. In this sense, the material manages to reach the thickness of polypyrrole necessary for the application but still preserving the good properties of the latex.
    The material according to the first aspect of the invention could also be used as a sensor or actuator, due to its electroactive properties, that is to say shape change in the presence of a certain current. It could be applied in the area of smart textiles, anticorrosive or antistatic protections, electronic circuits, OLEDS, polymer batteries, organic capacitors, etc.
    According to a second aspect, the present invention provides a method of synthesis of the material according to the first aspect of the invention, comprising:
    (a) adding a pyrrole nucleation and polymerization precursor to calcium carbonate-added latex, wherein said pyrrole nucleation and polymerization precursor is calcium carbonate,
    (b) adding the material resulting from the previous step to a solution of an oxidant, wherein said oxidant is ferric chloride,
    (c) add pyrrole to the material resulting from the previous step,
    where all stages are performed at a temperature between -2 ° C to 30 ° C.
    Within the range -2 ° C to 30 ° C, better results are obtained in the lower temperature range.
    Another embodiment is the procedure according to the second aspect, where the time of stage (c) is between 30 and 120 minutes.
    In the process according to the second aspect of the invention, a latex added with calcium carbonate is added, which is immersed in an aqueous solution of ferric chloride and pyrrole. The reaction can be carried out at low temperatures (in a simple ice bath) in a time between 30 and 120 minutes, obtaining an elastic and semiconductor composite. The material is obtained through a very simple process, but at the same time
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    effective, since it allows a complete adhesion of the conductive polymer on the surface of the latex, which does not come off even by subjecting it to tensile stresses greater than 500% elongation.
    The process according to the second aspect of the invention is a cheap and simple synthesis process, achieving a compromise between the mechanical properties of the latex and the electrical properties of polypyrrole, without the need to use high temperatures or other reagents that increase the price of the product. , which also represents an advantage in its environmental impact.
    In the process according to the second aspect of the invention, a very small amount of pyrrole is consumed in relation to the latex, which makes the process cheaper.
    BRIEF DESCRIPTION OF THE FIGURES
    Figure 1 shows SEM microscopy images of the material of the invention. The images correspond to cross sections of a sample of the material, in which penetration of the polypyrrole in the elastomeric layer is observed.
    Figure 2 shows an SEM microscopy image of a comparative material (not according to the invention). The thickness of the conductive layer is 8 microns and there is no penetration of polypyrrole in the elastomeric matrix.
    DESCRIPTION OF EMBODIMENTS
    Example 1. Method of synthesis of the material of the invention
    A sample of a latex added with calcium carbonate was taken and introduced into a solution of 10 ml of 1 M ferric chloride in aqueous solution, then 0.1 g of pyrrole was added from an aqueous solution of 0.45 M pyrrole After 15 minutes it was observed how the surface of the latex turned black (characteristic color of polypyrrole), indicating that polymerization of the polypyrrole on its surface has occurred. Said polypyrrole was perfectly adhered to the latex.
    It was also observed that polypyrrole was not only distributed around the latex in the form of a coating but also penetrated its pores, being able to conduct the current
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    electric not only superficially but also through it. The material thus obtained had a high elasticity and an electrical conductivity of approximately 3 S / cm. The material conducted the electricity subjected to an elongation greater than 100%, although the electrical resistance increases as it stretches.
    This is because latex alone has not been used as an elastomer, but it is a latex-calcium carbonate mixture.
    Example 2. Characterization of the material of the invention
    The calcium carbonate integrated in the latex favored the polymerization of the polypyrrole, because it is an adsorbent agent and because it favors the nucleation of the polymers, which translates into an increase in the thickness of the polypyrrole deposited on the latex. The thickness obtained from the conductive layer of polypyrrole is 23 microns.
    Figure 1 shows SEM microscopy images of the material obtained. The images show the penetration of polypyrrole (granular part of the figures) into the elastomeric layer, within the latex matrix, without the need to combine them in a mixture at high temperatures.
    An image of a comparative material (not according to the invention) is shown in Figure 2. The synthesis of this comparative material (not according to the invention) was carried out without using calcium carbonate as a precursor. In this comparative material (not according to the invention) a thickness of the conductive polypyrrole layer of 8 microns was observed, much less than the 23 microns obtained in the material of the invention. Also in this case there is no penetration of polypyrrole in the elastomeric matrix.
    权利要求:
    Claims (5)
    [1]

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    1. A material comprising latex and polypyrrole, characterized in that it further comprises a precursor to the nucleation and polymerization of pyrrole, wherein said precursor to the nucleation and polymerization of pyrrole is calcium carbonate.
    [2]
    2. A material according to claim 1, characterized in that said latex and said polypyrrole are configured as layers in the material and the thickness of the polypyrrole layer is between 18 and 28 microns.
    [3]
    3. A material according to claim 1 or 2, characterized in that the volumetric ratio latex: polypyrrole is between 60:40 and 40:60.
    [4]
    4. A method of synthesis of the material according to any of claims 1 to 3, characterized in that it comprises:
    (a) adding a pyrrole nucleation and polymerization precursor to calcium carbonate-added latex, wherein said pyrrole nucleation and polymerization precursor is calcium carbonate,
    (b) adding the material resulting from the previous step to a solution of an oxidant, wherein said oxidant is ferric chloride,
    (c) add pyrrole to the material resulting from the previous step,
    where all stages are performed at a temperature between -2 ° C to 30 ° C.
    [5]
    5. Method according to claim 4, characterized in that the time of step (c) is between 30 and 120 minutes.
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    同族专利:
    公开号 | 公开日
    ES2664973B1|2019-02-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JPS61250057A|1985-04-30|1986-11-07|Mitsui Toatsu Chem Inc|Conductive resin composition|
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    优先权:
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    ES201631362A|ES2664973B1|2016-10-24|2016-10-24|A material comprising latex, polypyrrole and a precursor for the nucleation and polymerization of pyrrole and the process for its synthesis|ES201631362A| ES2664973B1|2016-10-24|2016-10-24|A material comprising latex, polypyrrole and a precursor for the nucleation and polymerization of pyrrole and the process for its synthesis|
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