KR20150137417A - Composite comprising liquid fiber and process for preparing the same - Google Patents

Abstract

Disclosed is a composite comprising: at least two thermotropic liquid crystal polymer fibers disposed in parallel with each other in one direction; and a matrix covering the outer surface of the thermotropic liquid crystal polymer fibers, and made of a thermoplastic polymer. In addition, disclosed is a production method thereof.

Description

TECHNICAL FIELD [0001] The present invention relates to a composite material containing liquid crystal fibers,

TECHNICAL FIELD The present invention relates to a composite containing liquid crystal fibers and a method for producing the same, and more specifically, to a composite having a high strength and a high modulus of elasticity and containing liquid crystal fibers in a form of stability and a method for producing the same.

Fiber Reinforced Plastics (FRP) is a combination of synthetic resins and fiber reinforcements, which not only maintains the advantages of plastic corrosion resistance and ease of molding, but also provides tensile strength, impact resistance and heat resistance Is a composite material which can be additionally advantageous.

Since the fiber reinforced plastic is inexpensive and light in weight, it is used in various fields such as hull, bathtub, septic tank, and helmet of a small ship, and the technology fields thereof are gradually increasing.

BACKGROUND ART [0002] Conventional fiber-reinforced plastics include a fiber mat as a fiber reinforcement material in which fiber yarns are randomly dispersed and disposed, and a synthetic resin that is cured to maintain a predetermined shape by being combined with a fiber mat.

In such a conventional fiber-reinforced plastic, in order to have a predetermined shape, the thickness of the fiber-reinforced plastic must be increased to a large extent. For this purpose, the thickness of the fiber mat in which fiber yarns are dispersed and arranged must be increased. Since the positive fiber yarns are dispersed randomly without any consistent orientation, the synthetic resin does not sufficiently infiltrate into the inside of the fiber mat to weaken the binding force between the synthetic resin and the fiber mat. In order to prevent this, a thin fiber mat is laminated, There is a problem that the productivity is lowered.

In order to solve such a problem, there is an effort to increase the thickness of the fiber-reinforced plastic by increasing the amount of the synthetic resin instead of increasing the thickness of the fiber mat. However, as the amount of the synthetic resin used increases greatly, The amount of the fiber yarn is insufficient as compared with the amount of the fiber reinforced plastic.

Therefore, a new type capable of enhancing productivity and capable of imparting high strength and high modulus of elasticity to the reinforcing fiber itself and increasing the bonding strength with the resin forming the matrix surrounding the reinforcing fiber, while increasing the content of the reinforcing fiber It is necessary to develop a complex of

A problem to be solved by the present invention is to provide a composite having high strength and high modulus of elasticity and excellent in shape stability.

Another object to be solved by the present invention is to provide a method for producing the composite.

To solve these problems, according to one aspect of the present invention,

There is provided a composite comprising two or more thermotropic liquid crystalline polymer fibers arranged parallel to each other in one direction and a matrix of thermoplastic polymers surrounding the outer surfaces of the thermotropic liquid crystalline polymer fibers together.

The thermotropic liquid crystal polymer may be a wholly aromatic polyester.

The thermoplastic polymer may be at least one selected from the group consisting of polyester, polyolefin, polystyrene, polycarbonate, polyamide, polyimide, polyphenylene sulfide, polyphenylene oxide, polysulfone, and polyketone.

The polyester may be at least one selected from the group consisting of polyethylene naphthalate, polyethylene terephthalate, and polybutylene terephthalate.

The content of the thermotropic liquid crystal polymer fibers may be 30% by volume or more based on the total volume of the composite.

The volume ratio of the thermotropic liquid crystal polymer fibers to the matrix may be 3: 7 to 7: 3.

The average cross-sectional diameter of the thermotropic liquid crystal polymer fibers may be 10 占 퐉 or less.

The two or more thermotropic liquid crystal polymer fibers arranged in parallel to each other in the one direction may be a single layer single layer structure or a laminate structure of two or more layers.

In the laminated structure, the directions in which the thermotropic liquid crystalline polymer fibers are disposed may be the same or different between the respective layers.

According to another aspect of the present invention,

Melt-spinning a thermotropic liquid crystal polymer and a thermoplastic polymer to produce a chart paper comprising thermotropic liquid crystalline polymer fibers as a component and a thermoplastic polymer as a component;

Preparing preprinted sheets by arranging or laminating the chart paper in one direction; And

And thermally compressing the prepreg to produce a composite comprising a thermotropic liquid crystal polymer fiber laminated in one direction in a matrix made of a thermoplastic polymer.

The spinning nozzle of the melt spinning may have an L / D (length / diameter ratio) of 4 to 8.

The method may further include the step of further heat treating the chart paper obtained after the melt spinning in the step of manufacturing the chart paper.

The thermocompression bonding may be performed at a temperature lower than the melting point of the thermotropic liquid crystal polymer by at least 10 ° C.

The thermocompression may be performed under a pressure of 50 to 1,000 psi.

The composite according to an embodiment of the present invention is manufactured by arranging chart paper having a thermotropic liquid crystal polymer as a filler produced by the sea-island composite spinning in parallel in one direction. As a reinforcing material, High-modulus thermotropic liquid crystal polymer fibers can be contained in a high content, and the shape stability is remarkably improved, and can be suitably used for a flexible circuit board, a housing of an electronic product, and the like.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the detailed description of the invention given below, serve to further the understanding of the technical idea of the invention, And should not be construed as limiting.
Figure 1 illustrates a composite according to one embodiment of the present invention.
Figure 2 illustrates charts used in the fabrication of a composite according to an embodiment of the present invention.
3 is a cross-sectional SEM photograph of the chart paper produced in Example 1. Fig.
4 is a cross-sectional SEM photograph of the composite prepared in Example 1. Fig.
5 is a cross-sectional SEM photograph of the film produced in Comparative Example 1. Fig.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

According to an aspect of the present invention, there is provided a composite comprising two or more thermotropic liquid crystalline polymer fibers arranged in parallel to each other in one direction and a matrix of a thermoplastic polymer surrounding the outer surfaces of the thermotropic liquid crystalline polymer fibers.

The term "liquid crystal polymer" refers to a polymer having properties such that it can be arranged in a state of being arranged under the influence of a voluntary or external field in a solution or a molten state. Such a liquid crystal polymer is a thermotropic liquid crystal exhibiting liquid crystal phenomenon in a state of being melted by heat There are two kinds of polymer and a liquid crystalline polymer which shows a liquid crystal phenomenon at a certain concentration or higher when dissolved in a solvent because it does not melt even at a high temperature and is finally decomposed.

Accordingly, the thermotropic liquid crystal polymer fiber included in the composite according to an embodiment of the present invention refers to a fiber obtained by melt-spinning a liquid crystal polymerizable liquid crystal material in a molten state.

As the thermotropic liquid crystal polymer, wholly aromatic polyester may be used, and such wholly aromatic polyester includes at least one or more of the following components:

a) an aromatic group containing an oxy group or a carboxyl group

b) an aromatic group consisting of oxy groups on both sides

c) an aromatic unit whose terminal end is a carboxyl group

A) -OR-CO-, b) -OR0-, c) -OC-R-CO-, d) -NH-R-CO- and e) -NH -R < - >, and the like.

These wholly aromatic polyesters may be selected from the group consisting of aromatic oxycarboxylic acids (HO-R-COOH), aromatic diols (HO-R-OH), and aromatic dicarboxylic acids (HOOC-R-COOH) These monomers can be obtained by copolymerization, block polymerization, graft polymerization, and the like.

The aromatic hydrocarbon (R) is not particularly limited, but may be selected, for example, from the following.

At least one hydrogen in the aromatic hydrocarbon ring may be substituted with an alkyl group or an alkoxy group and may be substituted with a halogen element such as fluorine, chlorine, bromine and iodine, and may be substituted with a phenyl group or a complex element thereof, And a phenyl group substituted with an alkoxy group or an alkyl group.

Specifically, examples of the aromatic oxycarboxylic acid include hydroxybenzoic acid, hydroxynaphtooic acid, etc., and alkyl, alkoxy, and halogen substituents of the aromatic oxycarboxylic acid.

Examples of the aromatic dicarboxylic acid include terephthalic acid, isophthalic acid, diphenyldicarboxylic acid, naphthalene dicarboxylic acid, diphenyl ether dicarboxylic acid, diphenoxyethanedicarboxylic acid, diphenylethanedicarboxylic acid, etc. , And alkyl, alkoxy, and halogen substituents of the aromatic dicarboxylic acid.

Examples of the aromatic diol include hydroquinone, resorcin, dioxydiphenyl, naphthalenediol, and aromatic alkyl, alkoxy, and halogen substituents.

Therefore, according to one embodiment of the present invention, as the wholly aromatic polyester, polyester obtained by polymerizing the above-mentioned monomers and the like can be used. Preferred examples thereof include copolymers of p-hydroxybenzoic acid component and ethylene terephthalate component, copolymers of p-hydroxybenzoic acid component and 4,4-dihydroxybiphenyl and terephthalic acid or isophthalic acid, p-hydroxy A copolymer of a benzoic acid component and an acid component of 6-hydroxy-2-naphtho, a copolymer of a p-hydroxybenzoic acid component and an acid component of 6-hydroxy-2-naphtho with hydroquinone and terephthalic acid But are not limited thereto.

The thermotropic liquid crystal polymer preferably has a melting point in a range of 220 to 360 ° C, more preferably a melting point of 250 to 350 ° C. This melting point can be measured as the peak temperature of the main endothermic peak observed with a differential scanning calorimeter (DSC).

Examples of the thermoplastic polymer include vinyl polymers such as polyesters, polyolefins and polystyrene, polyarylates, polycarbonates, polyamides, polyimides, polyphenylene sulfides, polyphenylene oxides, polysulfones, aromatic polyketones, Aliphatic polyketones, semi-aromatic polyester amides, polyester ether ketones, and fluororesins.

At this time, the polyester may be at least one selected from the group consisting of polyethylene naphthalate, polyethylene terephthalate, and polybutylene terephthalate. Particularly, polyethylene naphthalate is more preferable from the viewpoints of stability of section formation and chemical resistance.

The composite according to an embodiment of the present invention may contain an inorganic substance such as various metal oxides, kaolin and silica, a colorant, a matting agent, a flame retardant, an antioxidant, an ultraviolet absorber, A small amount of additives such as a crystal nucleating agent, a fluorescent whitening agent, and an end-group sealing agent may be contained.

Referring to FIG. 1, a composite 10 according to an embodiment of the present invention includes two or more thermotropic liquid crystal polymer fibers 11 disposed in parallel to each other in one direction, and two or more thermotropic liquid crystal polymer fibers 11 And a matrix 12 made of a thermoplastic polymer.

That is, as described below, the composite according to an embodiment of the present invention can be obtained by obtaining a graphite sheet by using a thermotropic liquid crystalline polymer fiber as a matrix component and a matrix as a sea component, And is manufactured by thermocompression bonding. As a result, the sea component becomes a matrix by surrounding all of the components, and the component serves as a reinforcement in this matrix.

At this time, the chart paper is arranged in one direction, or the layer of sea water is arranged in one direction so as to be laminated in two or more layers, so that the thermotropic liquid crystal polymer fibers which are the components surrounded by the matrix are arranged parallel to each other in one direction As a result, the two or more thermotropic liquid crystalline polymer fibers arranged in parallel with each other in the one direction may be a single-layer structure or may be a laminate structure of two or more layers .

In the case of the laminated structure, the directions in which the thermotropic liquid crystal polymer fibers are arranged may be the same among the respective layers, or the directions in which the thermotropic liquid crystal polymer fibers are arranged may be different from each other. For example, .

The content of the thermotropic liquid crystal polymer fibers may be 30 vol% or more relative to the total volume of the composite. Furthermore, the volume ratio of the thermotropic liquid crystal polymer fibers to the matrix may be 3: 7 to 7: 3, more preferably 5: 5 to 7: 3. At this time, when the content of the thermotropic liquid crystal polymer fiber satisfies this range, it can have high strength and high modulus of elasticity.

The average cross-sectional diameter of the thermotropic liquid crystal polymer fibers may be 10 占 퐉 or less, more preferably 5 占 퐉 or less, and still more preferably 1 占 퐉 or less. At this time, when the average cross-sectional diameter of the thermotropic liquid crystal polymer fibers satisfies this range, it can have high strength and high modulus of elasticity.

According to another aspect of the present invention, there is provided a method for preparing a liquid crystal composition, comprising the steps of: melt spinning a thermotropic liquid crystal polymer and a thermoplastic polymer to produce chart paper comprising thermotropic liquid crystalline polymer fibers as a component and a thermoplastic polymer as a component; Preparing preprinted sheets by arranging or laminating the chart paper in one direction; And thermo-compressing the prepreg to produce a composite comprising thermotropic liquid crystalline polymer fibers arranged or laminated in one direction in a matrix made of a thermoplastic polymer.

First, in the step of preparing sea chart, a thermotropic liquid crystal polymer and a thermoplastic polymer may be prepared, and then, for example, pellets may be prepared. At this time, for example, the radiating device has a structure including a plurality of flow pipes vertically extending in the interior of each of a plurality of distribution plates, and a spinneret connected to the flow pipe. Due to the respective distribution plates and the spinning nozzle structure, the thermotropic liquid crystal polymer and the thermoplastic polymer as the components meeting each other according to the respective distribution plates are combined with each other and flowed into the spinning nozzle located inside the final distribution plate, do.

As a result, as shown in Fig. 2, the chart sheet 20 is surrounded by the sea component 22, so that a plurality of the planar components 21 are arranged parallel to each other in one direction.

The thermotropic liquid crystal polymer as a component of the sea chart has a nematic structure in which the longitudinal direction of the molecular chain is parallel to the alignment direction of the liquid crystal so that the molecular chains arranged in parallel in the molten state form a region, The anisotropic state becomes difficult to rotate.

Such anisotropic thermotropic liquid crystalline polymers are easily oriented in the direction of flow by shear stress in the molten state, so that the molecular chains are not tangled and slip smoothly, resulting in increased fluidity as the shear rate increases.

Further, since the thermotropic liquid crystal polymer has a long orientation relaxation time after being once oriented, the molecular chains are highly oriented when passing through the spinning nozzle, and the orientation structure is solidified even when the fibers are cooled, Strength, high modulus fiber can be provided.

Thus, according to one embodiment of the present invention, the L / D (length / diameter ratio) of the spinning nozzle during the melt spinning is 4 to 8, more preferably 5 to 7, / D. ≪ / RTI >

That is, when the L / D ratio of the spinning nozzle satisfies the above range, the time for orienting the thermotropic liquid crystal polymer fibers constituting the island component of the sea chart can be sufficiently secured, and the orientation angle of the liquid- It is possible to prevent the pressure applied to the nozzle from excessively increasing during spinning. When such a thermotropic liquid crystalline polymer fiber is used as a reinforcing material of the composite, A composite of elastic modulus can be provided.

In this case, the thermoplastic resin, which is a sea component, can be combined with the thermotropic liquid crystal polymer fibers surrounding the thermocomponent liquid crystalline polymer fibers to have a firm binding force with each other during the irradiation at an increased L / D ratio for sufficient orientation of the thermotropic liquid crystalline polymer fibers .

Therefore, the combination of the thermotropic liquid crystalline polymer fibers as the conductive component and the thermoplastic resin as the sea component, and the spinning conditions can be appropriately selected in consideration of the thermal properties in the mutual melting state.

Further, it is difficult to improve the mechanical properties of the thermotropic liquid crystal polymer by stretching the unstretched fiber as in the case of ordinary melt spinning, and the strength, elastic modulus, heat resistance and the like can be improved by heat treatment for a long time at a high temperature. It is known that the improvement of the mechanical properties by the heat treatment is due to the progress of the solid phase polymerization and the completeness of the crystal size and crystallinity during the heat treatment process.

As a result, according to the embodiment of the present invention, the heat treatment can be further performed after preparing the chart paper by the melt spinning. The heat treatment is carried out in an atmosphere of dry air or in an inert gas atmosphere at a rate of 1 to 10 ° C / hour to gradually increase the temperature to 20 to 60 ° C lower than the melting point of the thermotropic liquid crystalline polymer fiber before heat treatment . ≪ / RTI >

Thereafter, the prepared chart paper is arranged or laminated in one direction to prepare a prepreg. Wherein at least two thermotropic liquid crystalline polymer fibers are made of a conductive component and the thermoplastic resin comprises two or more charts made of a sea component surrounding these conductive components in parallel in parallel in one direction Or by lamination. That is, they may be arranged as a single layer in parallel with each other depending on the number of sea chart yarns, or may be a laminated structure in which two or more such layers are laminated. In such a laminated structure, charts in each layer may be arranged parallel to each other in left or right or up and down directions, and layers in which charts are arranged in parallel with each other with a single layer of charts are different from each other, As shown in Fig. For example, a monolayer of sea water strands arranged in parallel to each other in the laminated structure may be formed to be offset from each other by 90 degrees.

Next, the prepared prepreg is subjected to thermocompression bonding to produce a composite comprising thermotropic liquid crystalline polymer fibers arranged in one direction in a matrix made of a thermoplastic polymer.

The thermocompression bonding selectively melts a harmful component consisting of a thermoplastic resin surrounding a component that is a thermotropic liquid crystal polymer fiber in a chart paper arranged in one direction in a prepreg so as to melt the thermoplastic resin in a thermotropic liquid crystal Molding the polymer fibers into a matrix containing the polymer fibers.

As a result, such thermocompression should be performed at a temperature lower than the melting point of the thermotropic liquid crystal polymer as a component and higher than that of the thermoplastic resin as the sea component, for example, a temperature lower than 10 캜, more preferably 20 to 40 Lt; 0 > C.

According to one embodiment of the present invention, the thermocompression bonding may be performed under a pressure of 50 to 1,000 psi, more preferably 100 to 500 psi.

Since the composite according to one embodiment of the present invention thus obtained includes the thermotropic liquid crystal polymer fibers arranged in parallel in one direction in the matrix and having a high orientation, a high elastic modulus and a high strength as a reinforcing material, a tensile strength of 1 to 4 GPa Strength, and a high strength and a high modulus of elasticity of 40 to 120 GPa.

On the other hand, in the case of the conventional fiber reinforced plastic, it is difficult to increase the content of the reinforcing fibers in the matrix in order to sufficiently impregnate and bind the reinforcing fibers in the matrix resin, In comparison, it was 30% for short fibers and 60% for continuous fibers.

However, the composite according to one embodiment of the present invention is manufactured through the thermocompression step after preparing the prepreg using the chart paper as described above, and it is preferable that the composite body has a volume of 30% or more, 50% or more, and more preferably 50 to 70% of the thermotropic liquid crystal polymer fibers can be contained in the matrix as a reinforcing material.

As a result, the composite contains a high-strength, high-modulus, high-elasticity, thermotropic liquid crystalline polymer fiber as a reinforcing material, and the shape stability is remarkably improved. Thus, the composite has a flexible circuit board, ) Can be suitably used.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the following examples. However, the embodiments according to the present invention can be modified into various other forms, and the scope of the present invention should not be construed as being limited to the following embodiments. Embodiments of the invention are provided to more fully describe the present invention to those skilled in the art.

Example 1

(Manufactured by Nippon Polyurethane Industry Co., Ltd.) as a thermotropic liquid crystal polymer, a wholly aromatic liquid crystal polyester (melting point: 280 ° C, trade name: Vectra A950) as a conductive component, polyethylene naphthalate (PEN) ) To prepare chart marks. At this time, the tensile strength of the sea water sheet was 1.3 GPa and the elastic modulus was 58.7 GPa. A cross-sectional SEM photograph of the sea chart yarn is shown in Fig.

Thereafter, the prepared chart paper was laminated in one direction, and hot pressed at 250 DEG C and 100 psi using a hot press to prepare a composite. A cross-sectional SEM photograph of the composite is shown in FIG.

Example 2

Except that polyethylene terephthalate (PET) was used as a sea component instead of polyethylene naphthalate (PEN). At this time, the sea water had a tensile strength of 1.3 GPa and an elastic modulus of 58.7 GPa.

The chart paper thus prepared was laminated in one direction, and hot pressed under the conditions of 265 DEG C and 500 psi to prepare a composite.

Comparative Example 1

(Vectran A950, trade name: Vectran A950) as a matrix component, polyethylene terephthalate (PET) as a matrix component, and a ratio of a matrix component to a matrix component of 5: 5 (volume ratio ) Through a slit die. A sectional SEM photograph of the prepared film is shown in Fig.

Character rating

Section analysis

4 and 5, the cross section of the composite prepared in Example 1 and the cross section in the case of being produced in the form of a film through a T-die as in Comparative Example 1 are compared with each other, There were some similarities in the overall shape.

However, in the case of Example 1, the fibers having uniform cross-sectional diameters were arranged so as to be distributed and laminated in parallel in one direction, but in the case of Comparative Example 1, the thermotropic liquid crystal polymer components were melt- Or the size of the cross-sectional diameter becomes uneven.

Evaluation of tensile properties

The tensile strength and the elastic modulus of the composite prepared in Examples 1 and 2 and the film prepared in Comparative Example 1 were measured using a universal testing machine (Instron 3343) apparatus under the conditions of a holding distance of 100 mm and a tensile speed of 100 mm / min And the results are shown in Table 1 below.

The tensile strength Elastic modulus Example 1 1.1 GPa 47.6 GPa Example 2 0.8 GPa 80.3 GPa Comparative Example 1 18.4 MPa 2.3 GPa

Referring to Table 1, the complexes of Examples 1 and 2 were prepared by preparing a chart paper having a high strength and a high elastic modulus by sufficiently orienting the thermotropic liquid crystal polymer fibers, Are uniformly arranged in one direction as a reinforcing material and have a remarkably excellent property in terms of tensile strength and elasticity as compared with the film of Comparative Example 1 in which the liquid crystalline polymer is not uniformly fused to each other .

Claims (14)

At least two thermotropic liquid crystalline polymer fibers arranged parallel to each other in one direction and a matrix comprising a thermoplastic polymer and surrounding the outer surfaces of the thermotropic liquid crystalline polymer fibers. The method according to claim 1,
Wherein the thermotropic liquid crystal polymer is a wholly aromatic polyester. The method according to claim 1,
Wherein the thermoplastic polymer is at least one selected from the group consisting of polyester, polyolefin, polystyrene, polycarbonate, polyamide, polyimide, polyphenylene sulfide, polyphenylene oxide, polysulfone, and polyketone. The method of claim 3,
Wherein the polyester is at least one selected from the group consisting of polyethylene naphthalate, polyethylene terephthalate, and polybutylene terephthalate. The method according to claim 1,
Wherein the content of the thermotropic liquid crystal polymer fibers is 30% by volume or more based on the total volume of the composite. The method according to claim 1,
Wherein the volume ratio of the thermotropic liquid crystal polymer fibers to the matrix is 3: 7 to 7: 3. The method according to claim 1,
Wherein the average cross-sectional diameter of the thermotropic liquid crystal polymer fibers is 10 占 퐉 or less. The method according to claim 1,
Wherein at least two liquid crystal polymer fibers arranged parallel to each other in the one direction are a single-layered structure or a laminated structure of two or more layers. 9. The method of claim 8,
Wherein the thermotropic liquid crystal polymer fibers are arranged in the same direction or different directions between the respective layers in the laminated structure. Melt-spinning a thermotropic liquid crystal polymer and a thermoplastic polymer to produce a chart paper comprising thermotropic liquid crystalline polymer fibers as a component and a thermoplastic polymer as a component;
Preparing preprinted sheets by arranging or laminating the chart paper in one direction; And
And thermally compressing the prepreg to produce a composite comprising a thermotropic liquid crystal polymer fiber laminated in one direction in a matrix made of a thermoplastic polymer. 11. The method of claim 10,
Wherein the spinning nozzle of said melt spinning has an L / D (length / diameter ratio) of 4 to 8. < Desc / Clms Page number 13 > 11. The method of claim 10,
Further comprising the step of heat treating the chart paper obtained after the melt spinning in the step of producing the chart paper. 11. The method of claim 10,
Wherein the thermocompression bonding is performed at a temperature lower than the melting point of the thermotropic liquid crystal polymer by at least 10 ° C. 11. The method of claim 10,
Wherein the thermocompression bonding is performed at a pressure of 50 to 1,000 psi.

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