JP6481356B2 - Electrolyte for actuator element and actuator element - Google Patents

Description

  The present invention relates to an electrolyte for an actuator element and an actuator element. More specifically, the present invention relates to an electrolyte for an actuator element containing a specific ionic liquid, and an actuator element using the same.

  Accompanying dramatic advances in the electronics and energy fields, there is a growing need for actuators that are compact, lightweight and flexible. In particular, since the polymer actuator element is lightweight and flexible and has a simple configuration, it is expected to be applied to an introduction part of a medical device such as a catheter, various driving devices, and a pressing device.

  This polymer actuator element is composed of an electroconductive polymer such as polypyrrole or polyaniline that utilizes redox expansion / contraction in the electrolyte (electroconductive polymer actuator), an ion exchange membrane, and a junction electrode. In a water-containing state, it is broadly classified into those that cause the ion exchange membrane to bend and deform by applying a potential difference (ion conductive polymer actuator).

  Each of these polymer actuator elements requires an electrolyte for its operation, and an aqueous solution has been conventionally used as the electrolyte. In particular, ion conductive polymer actuators are basically used in water because ion exchange resins do not exhibit sufficient ion conductivity unless they are swollen with water. It is necessary to prevent water evaporation.

  In view of this point, a method has been reported in which a polymer actuator element is coated with a resin to prevent evaporation of water from the element. However, it is difficult to completely cover the device, and there is a problem that the coating is broken by a slight gas generation due to the electrode reaction, and since the coating itself becomes a resistance to deformation response, it has not been put into practical use. Further, there is a problem that it is difficult to use an aqueous medium polymer actuator element below the freezing point of water. Furthermore, there was a problem in long-term stability due to the volatilization of the solvent.

  As described above, the conventional polymer actuator element is driven only in a limited environment mainly in an aqueous electrolyte solution, and its application is necessarily limited. Therefore, the development of an actuator element that can be driven in air or vacuum is indispensable for practical application of a small actuator to a wide range of applications.

  Recently, attempts have been made to use an ionic liquid as an electrolyte of a polymer actuator element in order to solve the above problems (Patent Documents 1 to 6). Since the ionic liquid has negligible vapor pressure, it is possible to prevent the solvent from drying due to volatilization. By using it as the electrolyte of the polymer actuator element, the element can be used in the air, and its wide range It is expected to be applicable to applications. However, these ionic liquids also have a problem that the driving voltage range is narrow and the displacement is small because the potential window is narrow, and there is room for further improvement in terms of voltage resistance, viscosity, ion conductivity, and the like.

JP 2008-054446 A JP 2007-204682 A JP 2006-050780 A JP 2010-233429 A JP 2011-050233 A JP-T-2004-527902

  The present invention has been made in view of such circumstances, and an electrolyte for an actuator element that can be driven at a low voltage, provides an actuator element that is stable in air or vacuum and has a large amount of displacement, and an actuator using the same An object is to provide an element.

  As a result of intensive investigations to achieve the above object, the present inventors have found that an ionic liquid having a predetermined pyrrolidinium cation has excellent stability and voltage resistance, low viscosity and good electrical conductivity. Therefore, the present invention was completed by finding it suitable as an electrolyte for actuator elements.

（式中、Ｒ¹は、炭素数１〜３のアルキル基を表し、Ｒ²は、メチル基又はエチル基を表し、ｎは、１又は２を表し、Ｘ^-は、１価のアニオンを表す。）
２．前記Ｘ^-が、ＢＦ₄ ^-、ＣＦ₃ＳＯ₃ ^-、ＣＦ₃ＣＯ₂ ^-、ＰＦ₆ ^-、(ＣＦ₃ＳＯ₂)₂Ｎ^-又は(ＦＳＯ₂)₂Ｎ^-を表す１のアクチュエータ素子用電解質。
３．前記Ｘ^-が、(ＣＦ₃ＳＯ₂)₂Ｎ^-を表す１又は２のアクチュエータ素子用電解質。
４．前記Ｒ¹が、メチル基又はエチル基を表す１〜３のいずれかのアクチュエータ素子用電解質。
５．前記ｎが１である１〜４のいずれかのアクチュエータ素子用電解質。
６．前記高分子化合物がアクリル系樹脂である１〜５のいずれかのアクチュエータ素子用電解質。
７．前記高分子化合物がウレタン系樹脂である１〜５のいずれかのアクチュエータ素子用電解質。
８．前記高分子化合物がフッ素系樹脂である１〜５のいずれかのアクチュエータ素子用電解質。
９．前記高分子化合物がシリコーン系樹脂である１〜５のいずれかのアクチュエータ素子用電解質。
１０．１〜９のいずれかのアクチュエータ素子用電解質を複数の電極で挟持してなるアクチュエータ素子。 That is, the present invention provides the following actuator element electrolyte and actuator element.
1. An electrolyte for an actuator element comprising an ionic liquid represented by the following formula (1) and a polymer compound.

(In the formula, R ¹ represents an alkyl group having 1 to 3 carbon atoms, R ² represents a methyl group or an ethyl group, n represents 1 or 2, and X ⁻ represents a monovalent anion. .)
2. 1. The electrolyte for an actuator element according to claim 1, wherein X ⁻ represents BF ₄ ⁻ , CF ₃ SO ₃ ⁻ , CF ₃ CO ₂ ⁻ , PF ₆ ⁻ , (CF ₃ SO ₂ ) ₂ N ⁻ or (FSO ₂ ) ₂ N ^−. .
3. The electrolyte for actuator elements according to 1 or 2, wherein X ⁻ represents (CF ₃ SO ₂ ) ₂ N ⁻ .
4). The electrolyte for actuator elements according to any one of 1 to 3, wherein R ¹ represents a methyl group or an ethyl group.
5. The electrolyte for actuator elements according to any one of 1 to 4, wherein n is 1.
6). The electrolyte for actuator elements according to any one of 1 to 5, wherein the polymer compound is an acrylic resin.
7). The electrolyte for actuator elements according to any one of 1 to 5, wherein the polymer compound is a urethane resin.
8). The electrolyte for actuator elements according to any one of 1 to 5, wherein the polymer compound is a fluororesin.
9. The electrolyte for actuator elements according to any one of 1 to 5, wherein the polymer compound is a silicone resin.
10. An actuator element formed by sandwiching an electrolyte for an actuator element according to any one of 10.1 to 9 between a plurality of electrodes.

The ionic liquid used in the present invention is pyrrolidinium-based and has a wider potential window than the aromatic ionic liquid, so that the driving voltage range is narrow and the displacement is correspondingly large. In addition, the viscosity is lower than that of the ammonium-based ionic liquid, the mobility in the resin is excellent, and the response is good. In addition, since the ionic liquid used in the present invention is non-volatile, the actuator element of the present invention using the ionic liquid can be driven stably in the air for a long period of time, and also operates under vacuum conditions.
That is, the ionic liquid used in the present invention is excellent in stability and voltage resistance, and has low viscosity and good electrical conductivity. Therefore, when it is used, it has excellent stability and durability, and responsiveness. A good actuator element can be obtained.

1 is a ¹ H-NMR spectrum diagram of MEMP • FSA obtained in Synthesis Example 1. FIG. 6 is a ¹ H-NMR spectrum diagram of MMMP · FSA obtained in Synthesis Example 3. FIG. It is a figure which shows the electric potential window measurement result of each ionic liquid obtained by the synthesis examples 1 and 3. FIG. It is a schematic diagram of the actuator produced in the Example.

  The actuator element electrolyte of the present invention includes an ionic liquid represented by the following formula (1) and a polymer compound.

In formula (1), R ¹ represents an alkyl group having 1 to 3 carbon atoms. The alkyl group may be linear, branched or cyclic, and examples thereof include a methyl group, an ethyl group, an n-propyl group, an i-propyl group and a c-propyl group. Among them, a methyl group and an ethyl group are more preferable, and a methyl group is even more preferable. R ² represents a methyl group or an ethyl group, and is preferably a methyl group. n represents 1 or 2.

  Among these, as the cationic structure, a structure represented by the following formula (A) is preferable from the viewpoint of more excellent thermal stability, and a structure represented by the following formula (B) is preferable from the viewpoint of lower viscosity. .

In formula (1), X ⁻ is a monovalent anion and is not particularly limited as long as it is an anion capable of forming an ionic liquid, but BF ₄ ⁻ , CF ₃ SO ₃ ⁻ , CF ₃ CO ₂ ⁻ , PF ₆ ^−. , (C ₄ F ₉ SO ₂ ) ₂ N ⁻ , (C ₃ F ₇ SO ₂ ) ₂ N ⁻ , (C ₂ F ₅ SO ₂ ) ₂ N ⁻ , (C ₂ F ₅ SO ₂ ) (CF ₃ SO ₂ ) N ⁻ , (CF ₃ SO ₂ ) ₂ N ⁻ , (CF ₃ SO ₂ ) (FSO ₂ ) N ⁻ , (FSO ₂ ) ₂ N ^{− and the} like. In the present invention, mainly from the viewpoint of economy, BF ₄ ⁻ , CF ₃ SO ₃ ⁻ , CF ₃ CO ₂ ⁻ , PF ₆ ⁻ , (CF ₃ SO ₂ ) ₂ N ⁻ , (FSO ₂ ) ₂ N ^{− and the} like. In view of thermal stability, voltage resistance, low viscosity, etc., (CF ₃ SO ₂ ) ₂ N ⁻ and (FSO ₂ ) ₂ N ⁻ are more preferable, and (CF ₃ SO ₂ ) ₂ N ⁻ is more preferable. Further preferred.

  The ionic liquid used in the present invention can be produced by the method described in International Publication No. 2002/076924 or the specification of Chinese Patent Application No. 10147243, for example, N-alkoxyalkyl-N produced according to a conventional method. -An alkylpyrrolidinium halide (for example, chloride, bromide, etc.) and an alkali metal (for example, sodium, potassium, etc.) salt of a desired anion can be obtained by anion exchange reaction in water or an organic solvent. Moreover, after converting a halide salt into a hydroxide salt using an anion exchange resin, it can also be synthesized by other known methods such as synthesis by a neutralization reaction with an acid corresponding to an anion.

  Examples of the ionic liquid that can be suitably used in the present invention include, but are not limited to, the following.

  The amount of the ionic liquid used in the actuator element of the present invention varies depending on the combination of the type of ionic liquid used and the type of polymer compound, and it is preferable to obtain and use the optimum amount as appropriate. When the molecular compound is in a gel form, the amount of the ionic liquid used is usually preferably about 60 to 99% by mass and more preferably about 65 to 95% by mass in the electrolyte. For example, when the polymer compound is an elastomer, the amount of the ionic liquid used is usually preferably about 0.1 to 60% by mass and more preferably about 1 to 50% by mass in the electrolyte.

  As the polymer compound contained in the electrolyte of the present invention, a polymer compound conventionally used in electrolytes for polymer actuator elements, for example, a gel-forming material or an elastomer may be appropriately selected and used. However, it may be a dielectric material. As such a polymer compound, an acrylic resin, a fluorine resin, a urethane resin, a silicone resin, or the like is preferable. The polymer compounds may be used alone or in combination of two or more.

  Examples of the acrylic resin include poly (meth) acrylic acid, poly (meth) acrylamide, polyalkyl methacrylate, polyalkyl acrylate, polyhydroxyalkyl methacrylate, polyhydroxyalkyl acrylate, polyacrylonitrile, and styrene-hydroxyalkyl (meth) acrylate. Examples thereof include a polymer, a styrene- (meth) acrylic acid ester copolymer, a styrene- (meth) acrylic acid copolymer, and an acrylonitrile-butadiene copolymer.

  Fluorine resins include polyvinylidene fluoride, polytetrafluoroethylene, polychlorotrifluoroethylene, polytrifluoroethylene, polyvinyl fluoride, vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-tetrafluoroethylene copolymer Polymer, vinylidene fluoride-chlorotrifluoroethylene copolymer, vinylidene fluoride-hexafluoroacetone copolymer, vinylidene fluoride-pentafluoropropylene copolymer, vinylidene fluoride- (meth) acrylic acid copolymer, fluoropolymer Vinylidene fluoride- (meth) acrylic acid ester copolymer, ethylene-tetrafluoroethylene copolymer, propylene-tetrafluoroethylene copolymer, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene -Perfluoromethyl vinyl ether copolymer, tetrafluoroethylene-perfluoropropyl vinyl ether copolymer, tetrafluoroethylene-perfluoro-2,2-dimethyl-1,3-dioxole copolymer, tetrafluoroethylene-perfluorosulfone Acid monomer copolymer, ethylene-chlorotrifluoroethylene copolymer, vinylidene fluoride-tetrafluoroethylene-hexafluoropropylene copolymer, vinylidene fluoride-tetrafluoroethylene-perfluoromethyl vinyl ether copolymer, vinylidene fluoride -Tetrafluoroethylene-perfluoropropyl vinyl ether copolymer, vinylidene fluoride-tetrafluoroethylene-pentafluoropropylene copolymer, and the like.

  Examples of the urethane resin include polyurethane. Examples of the silicone resin include polysiloxane.

  Examples of polymer compounds that can be used other than those mentioned above include polyethylene, polypropylene, polyisobutene, polymethyl vinyl ketone, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polypyrrole, polyindole, polyaniline, polythiophene, polyacetylene, polyacetylene. Isothianaphthene, polyfuran, polyselenophene, polytellurophene, polythiophene vinylene, polyparaphenylene vinylene, polycarboxylate vinyl, polycarbonate resin, polyester resin, polyimide resin, cellulose resin, polyvinyl pyridine, starch, polypeptide, polystyrene, par Fluoropolyether, polyethylene oxide, polypropylene oxide and the like can be mentioned.

  When the polymer compound used in the actuator element of the present invention is in a gel form, the amount used is usually preferably about 1 to 40% by mass and more preferably about 5 to 35% by mass in the electrolyte. Moreover, when the said high molecular compound is an elastomer, the usage-amount is normally about 40-99.9 mass% in an electrolyte, and about 50-99 mass% is more preferable.

  The electrolyte for actuator elements of the present invention may further contain a conductive filler. Examples of the conductive filler include conductive metal nanoparticles and conductive nanocarbon materials. Examples of the metal constituting the conductive metal nanoparticles include gold, silver, copper, platinum, palladium, nickel, rhodium, aluminum, tin, zinc, lead, titanium, tantalum, and alloys thereof. Examples of the conductive nanocarbon material include fullerene, carbon nanoball, carbon nanofiber, carbon nanotube, and carbon nanohorn. These may be appropriately selected according to the purpose and application.

  The blending amount of the conductive filler is preferably about 0.1 to 10% by mass, and more preferably about 0.5 to 5% by mass in the electrolyte.

  The actuator element of the present invention comprises the actuator element electrolyte sandwiched between a plurality of electrodes. As a material for the electrode, a known material such as a metal, a conductive polymer, or carbon can be used. The actuator element of the present invention can be produced by a conventionally known method.

  Examples of the metal include gold, platinum, aluminum, indium, indium oxide, tin (IV) oxide, ITO, and silver. Examples of the method for forming the metal electrode include an electroless plating method, an ion plating method, a plasma CVD method, an ion sputtering coating method, a vacuum deposition method, screen printing, an ion beam assist method, and an ionization deposition method. Moreover, an electrode can also be obtained by mixing metal fine particles with a commonly used known binder resin and forming it into a film shape.

Examples of the conductive polymer include polyaniline, polypyrrole, polythiophene, and derivatives thereof. The conductive polymer may be doped with a dopant. In this case, as the dopant, conventionally known ones such as PF ₆ ⁻ , BF ₄ ⁻ , ClO ₄ ⁻ , SbF ₆ ⁻ , SO ₄ ^{2− are used.} Inorganic anions such as alkylbenzene sulfonate ions and alkyl naphthalene sulfonate ions can be used.

  As a method of sandwiching an electrolyte layer between a plurality of electrodes made of a conductive polymer, a method in which a conductive polymer is chemically or electrochemically formed on both surfaces of an electrolyte prepared in a sheet shape in advance. For example, a method of forming an electrolyte by applying a monomer, an ionic liquid, and a polymerization initiator to a surface of an electrode prepared in a sheet shape in advance and performing heat copolymerization may be used.

  Examples of the carbon include carbon nanotubes, carbon black, fullerene, and activated carbon. The method for forming the carbon electrode is not particularly limited, and examples thereof include a method in which carbon is mixed with a commonly used known binder resin to form a film. The actuator element can be manufactured by sandwiching and pressing the carbon electrode thus obtained and the electrolyte of the present invention by a conventionally known method, for example, by sandwiching the electrolyte of the present invention between a plurality of carbon electrodes.

  Since the ionic liquid is contained in the electrolyte, the actuator element of the present invention has high ionic conductivity, improved dry-up of the electrolyte layer due to volatilization of the solvent, and the conductive polymer actuator using the electrolyte has low Displacement is large with voltage, and it can operate stably for a long time in air or vacuum.

EXAMPLES Hereinafter, although a synthesis example and an Example are given and this invention is demonstrated more concretely, this invention is not limited to the following Example. The analyzers used are as follows.
[1] ¹ H-NMR spectrum apparatus: AL-400 manufactured by JEOL Ltd.
Solvent: Heavy dimethyl sulfoxide [2] Viscometer device: manufactured by BROOK FIELD, programmable rheometer [3] Electrical conductivity device: manufactured by Toa DKK Corporation Electric conductivity meter CM-30R
[4] Potential window device: Standard voltammetric tool HSV-100 manufactured by Hokuto Denko Co., Ltd.

[1] Synthesis of ionic liquid [Synthesis Example 1] Synthesis of MEMP • FSA

Pyrrolidine (manufactured by Wako Pure Chemical Industries, Ltd.) 1.51 parts by mass and 2-methoxyethyl chloride (manufactured by Kanto Chemical Co., Ltd.) 1.00 parts by mass were mixed and reacted for 1 hour while refluxing. After the reaction, the reaction solution was separated into two layers, but the lower layer solidified when allowed to cool for a while. Only the upper layer was recovered by decantation and purified by distillation under reduced pressure to obtain 0.96 parts by mass of N-2-methoxyethylpyrrolidine (boiling point 76 ° C./vapor pressure 45 mmHg) as the target product (yield 70%).
1.00 parts by mass of the obtained N-2-methoxyethylpyrrolidine and 2 times volume of toluene (manufactured by Wako Pure Chemical Industries, Ltd.) are mixed and placed in an autoclave, and the system is purged with nitrogen. did. After making the sealed system, about 1.00 parts by mass of methyl chloride gas (manufactured by Nippon Special Chemical Industry Co., Ltd.) was added with stirring at room temperature. When methyl chloride gas was introduced, the temperature and internal pressure increased. At the maximum, the temperature increased to about 53 ° C., and the internal pressure increased to 5.5 kgf / cm ² (about 5.4 × 10 ⁵ Pa). The reaction was continued without heating, and about 0.75 parts by mass of methyl chloride gas was added after 2 days. After further reaction for 1 day, the pressure was released, and the crystals formed in the system were filtered off under reduced pressure, dried using a vacuum pump, and N-2-methoxyethyl-N-methylpyrrolidinium chloride. 1.29 parts by mass were obtained (yield 92%).
An equivalent volume of ion-exchanged water was added to 1.00 parts by mass of the obtained N-2-methoxyethyl-N-methylpyrrolidinium chloride, and dissolved by stirring. This solution was added with stirring to a solution prepared by dissolving 1.29 parts by mass of potassium bis (fluorosulfonyl) amide (manufactured by Kanto Chemical Co., Inc.) in an equivalent volume of ion-exchanged water. After reacting at room temperature for 3 hours or more, the reaction solution separated into two layers is separated, and the lower organic layer is washed twice with ion-exchanged water and then dried using a vacuum pump. 1.50 parts by mass of N-2-methoxyethyl-N-methylpyrrolidinium bis (fluorosulfonyl) amide (MEMP · FSA) was obtained (yield 83%). The ¹ H-NMR spectrum of MEMP • FSA is shown in FIG. The viscosity at 25 ° C. was 35 cP.

[Synthesis Example 2] Synthesis of MEMP • TFSA

  An equivalent volume of ion-exchanged water was added to 1.00 parts by mass of N-2-methoxyethyl-N-methylpyrrolidinium chloride obtained by the same synthesis method as in Synthesis Example 1, and dissolved by stirring. This solution was added with stirring to a solution prepared by dissolving 1.68 parts by mass of lithium bis (trifluoromethanesulfonyl) amide (manufactured by Kanto Chemical Co., Inc.) in an equivalent volume of ion-exchanged water. After reacting at room temperature for 3 hours or more, the reaction solution separated into two layers is separated, and the lower organic layer is washed twice with ion-exchanged water and then dried using a vacuum pump. 1.50 parts by mass of N-2-methoxyethyl-N-methylpyrrolidinium bis (trifluoromethanesulfonyl) amide (MEMP · TFSA) was obtained (yield 83%). The viscosity at 25 ° C. was 50 cP.

Synthesis Example 3 Synthesis of MMMP • FSA

A solution prepared by dissolving 14.4 parts by mass of N-methylpyrrolidine (manufactured by Wako Pure Chemical Industries, Ltd.) in 200 parts by mass of tetrahydrofuran (manufactured by Wako Pure Chemical Industries, Ltd.) was ice-cooled, and chloromethyl methyl ether was stirred. 17.1 parts by mass (manufactured by Tokyo Chemical Industry Co., Ltd.) was added. After reacting overnight, the precipitated solid was filtered under reduced pressure using a Kiriyama funnel. The obtained white solid was dried using a vacuum pump to obtain 26.7 parts by mass of an intermediate N-methoxymethyl-N-methylpyrrolidinium chloride (yield 96%).
8.58 parts by mass of the obtained N-methoxymethyl-N-methylpyrrolidinium chloride was dissolved in 10 parts by mass of ion-exchanged water. This solution was added with stirring to a solution prepared by dissolving 12.5 parts by mass of potassium bis (fluorosulfonyl) amide (manufactured by Kanto Chemical Co., Ltd.) in 5 parts by mass of ion-exchanged water. After stirring overnight at room temperature, the reaction solution separated into two layers was separated, washed four times with the lower organic layer ion-exchanged water, dried using a vacuum pump, and the target N- 10.2 parts by mass of methoxymethyl-N-methylpyrrolidinium bis (fluorosulfonyl) amide (MMMP • FSA) was obtained (yield 63%). The ¹ H-NMR spectrum of MMMP · FSA is shown in FIG. The viscosity at 25 ° C. was 20 cP.

Synthesis Example 4 Synthesis of MMMP / TFSA

  Synthesis Example 2 except that N-2-methoxyethyl-N-methylpyrrolidinium chloride was replaced with N-2-methoxymethyl-N-methylpyrrolidinium chloride obtained by the same synthesis method as Synthesis Example 3. In the same manner as above, N-2-methoxymethyl-N-methylpyrrolidinium bis (trifluoromethanesulfonyl) amide (MMMP • TFSA), which was the object, was obtained. The viscosity at 25 ° C. was 42 cP.

  The electric conductivity of each ionic liquid obtained in Synthesis Examples 1 and 3 was measured. The measurement was performed in a thermostatic bath at 25 ° C. using an electric conductivity meter. The results are shown in Table 1.

  Further, the potential window was measured for each ionic liquid obtained in Synthesis Examples 1 and 3. The results are shown in FIG. As shown in FIG. 3, it was found that both ionic liquids have a wide potential window.

[2] Manufacture and operation test of actuator [Example 1]
An electrolytic polymerization solution was prepared by dissolving pyrrole as a conductive polymer monomer and tetraethylammonium tetrafluoroborate as an electrolyte salt in propylene carbonate.
In this electrolytic polymerization solution, two stainless steel plates that are masked on one side with an insulating tape are immersed horizontally. One is the anode, the other is the cathode, and a constant current electrolysis at a current density of 0.5 mA / cm ² for 4 hours. Then, an electrolytic polymerization polypyrrole film was formed on the anode surface. The polypyrrole film was peeled from the stainless steel plate, washed with acetone, and then cut into a predetermined size to obtain a plate electrode having a width of 3 mm, a length of 25 mm, and a thickness of about 20 μm.
In order to form an electrolyte layer between the electrodes, first, 20% methyl methacrylate, 0.5% ethylene glycol dimethacrylate as a crosslinking agent, 0.5% benzoyl peroxide as a polymerization initiator, and MEMS as an ionic liquid -It mixed so that it might become a compounding ratio of FSA79%, and the solution for uniform electrolyte layer formation was prepared.
The solution is sufficiently impregnated with separator paper (Nippon Paper Crecia Co., Ltd., Kimwipe (registered trademark) S-200) having the same size as the plate-like electrode, and between the two plate-like electrodes prepared previously. A laminated body was sandwiched between the glass plates, and the laminated body was sandwiched between glass plates and subjected to heat copolymerization at 90 ° C. for 3 hours to obtain an actuator element in which a gel electrolyte was sandwiched between two plate-like electrodes. The thickness of the actuator element was about 100 μm.

[Example 2]
An actuator element was produced in the same manner as in Example 1 except that the ionic liquid used in Example 1 was changed from MEMP · FSA to MEMP · TFSA.

[Example 3]
An actuator element was produced in the same manner as in Example 1 except that the ionic liquid used in Example 1 was changed from MEMP · FSA to MMMP · FSA.

[Example 4]
An actuator element was produced in the same manner as in Example 1 except that the ionic liquid used in Example 1 was changed from MEMP · FSA to MMMP · TFSA.

[Comparative Example 1]
The actuator element was prepared in the same manner as in Example 1 except that the ionic liquid used in Example 1 was changed from MEMP • FSA to 1-ethyl-3-methylimidazolium bis (trifluoromethanesulfonyl) amide (EMI • TFSA). Was made.

<Actuator operation test>
Using the actuator elements produced in the examples and comparative examples, the apparatus shown in FIG. 4 was assembled, voltage application was repeated once, ten times, and 50 times, and the arrival time until the tip of the element was deformed by 5 mm was measured.
As a voltage application condition to the plate electrode of the actuator, a voltage of 3V was applied between the plate electrodes of the actuator, and the time until the actuator reached the predetermined displacement after the deformation started was measured. After the measurement is completed, the two plate electrodes are short-circuited to return to the initial shape before the actuator is deformed, then the polarity is switched and a voltage of 3 V is applied to measure the time until the predetermined deformation amount is reached. did. After completion of the measurement, the two plate electrodes were short-circuited to return the actuator to the initial shape. Thus, the operation of applying a voltage to the plate-like electrode in the forward / reverse direction was taken as one cycle, and the arrival time and the displacement amount were measured when this cycle was repeated once, ten times, and 50 times. Table 2 shows the measurement results of the amount of displacement and the arrival time in the forward direction of each cycle number.

  It was found that the response speed of the actuator element using the ionic liquid of the present invention is faster than that using the conventional ionic liquid.

1 Positive electrode 2 Electrolyte layer 3 Negative electrode

Claims (10)

An electrolyte for an actuator element comprising an ionic liquid represented by the following formula (1) and a polymer compound.

(In the formula, R ¹ represents an alkyl group having 1 to 3 carbon atoms, R ² represents a methyl group or an ethyl group, n represents 1 or 2, and X ⁻ represents a monovalent anion. .) _2. The actuator according to claim 1, wherein X ⁻ represents BF ₄ ⁻ , CF ₃ SO ₃ ⁻ , CF ₃ CO ₂ ⁻ , PF ₆ ⁻ , (CF ₃ SO ₂ ) ₂ N ⁻ or (FSO ₂ ) ₂ N ^−. Electrolyte for device. The electrolyte for an actuator element according to claim 1, wherein the X ⁻ represents (CF ₃ SO ₂ ) ₂ N ⁻ . The electrolyte for actuator elements according to claim 1, wherein R ¹ represents a methyl group or an ethyl group.   5. The actuator element electrolyte according to claim 1, wherein n is 1. 5.   The electrolyte for actuator elements according to claim 1, wherein the polymer compound is an acrylic resin.   The electrolyte for an actuator element according to any one of claims 1 to 5, wherein the polymer compound is a urethane-based resin.   The electrolyte for an actuator element according to claim 1, wherein the polymer compound is a fluororesin.   The electrolyte for an actuator element according to any one of claims 1 to 5, wherein the polymer compound is a silicone resin.   The actuator element formed by pinching | interposing the electrolyte for actuator elements of any one of Claims 1-9 with several electrodes.

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