JPH05339506A - Functional composite material - Google Patents

Abstract

PURPOSE:To obtain a semiconductive composite material which can easily be molded into any shape by mixing a gluten, gliadin, or glutenin with a polyhydric alcohol. CONSTITUTION:A gluten, gliadin, or glutenin is mixed with a polyhydric alcohol (e.g. ethylene glycol) to obtain the title material. The amount of the alcohol is preferably 20-50, 5-50, or 20-50 pts.wt. per 100 pts.wt. gluten, gliadin, or glutenin, respectively. Since this material can easily be molded into any shape, it can be utilized as a functional material when molded into a desired shape and connected to adequate electrodes. Examples of its application include a sensor for detecting something as a mean for a large area, e.g. a planar or linear area, and a sensor fitted to a curved or movable surface. Dissolving or dispersing the material into a solvent gives a coating composition, adhesive, etc., from which a film can be formed.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a novel composite material having a semiconducting function.

[0002]

2. Description of the Related Art Wheat gluten is known to be hardened by heat to form a molded article (JP-A-2-67109). This molded body is
It has biodegradability and is one of the materials expected in the future.

However, only such a molded article is known to have an electric insulating property, and it has no practical value as an electric / electronic material.

An object of the present invention is to provide a novel semiconducting composite material from conventionally known electrically insulating wheat gluten or its component gliadin or glutenin.

[0005]

The functional composite material of the present invention comprises gluten and a polyhydric alcohol.

Another functional composite material of the present invention comprises gliadin and a polyhydric alcohol.

Still another functional composite material of the present invention comprises glutenin and polyhydric alcohol.

As described above, a semiconductive composite material can be obtained by combining the electrically insulating gluten, gliadin or glutenin with the polyhydric alcohol.

The gluten used in the present invention is a general term for proteins in wheat, and is a giant protein in which gliadin and glutenin, which are polypeptides derived from wheat endoplasmic reticulum, cell membrane, and protein body, are bound to each other by disulfide bond or hydrogen bond. Molecule, usually carbohydrates 10-12
%, Lipids 8-12%.

As the polyhydric alcohol used in the present invention,
Ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, glycerin,
Examples thereof include sorbitol, and among them, dihydric alcohols are preferable, and ethylene glycol and diethylene glycol are particularly preferable.

The compounding ratio of the composite material of the present invention is as follows: 20 to 50 parts of polyhydric alcohol to 100 parts of gluten (parts by weight; hereinafter the same), 5 to 50 parts of polyhydric alcohol to 100 parts of gliadin, and 100 parts of glutenin. It is preferably 20 to 50 parts of polyhydric alcohol with respect to parts.

Since the composite material of the present invention has the same molding processability as general-purpose plastics, it can be easily molded into an arbitrary shape. Therefore, it can be used as a functional material by taking out an appropriate electrode by taking an average function detection of a wide area such as a plane shape or a linear shape or a sensor of a bent surface or a movable surface. it can.

Alternatively, by dissolving or dispersing this material in a solvent, it can be used as a paint, an adhesive or the like, or can be applied to an arbitrary support to form a coating film.

[0014]

EXAMPLES The functional composite material of the present invention will be specifically described below based on examples.

Examples 1 to 3 and Comparative Examples 1 to 3 The ingredients were uniformly mixed using a juice mixer in the proportions (parts) shown in Table 1 to prepare wet cake-like dough. A part of the cloth is sandwiched between two PET (polyethylene terephthalate) films, and at 150 ° C, 50 kg /
A film was prepared by pressing for 1 minute under a pressure of cm ² . The film thickness of this film was about 80 to 400 μm.

The semiconductor characteristics of the obtained film were measured using a curve tracer (Model 370 manufactured by Tektronix). The results are shown in Table 1.

[0017]

[Table 1]

FIG. 1 shows a relationship diagram (measured with the above curve tracer) between the load voltage and the transmission current in the film of Example 2. It is clear that the film of this example has semiconductivity when compared with the relationship diagram (FIG. 7) between the load voltage and the transmission current in silicon.

Example 4 The relationship between the load voltage and the permeation current was measured by changing the compounding ratio of diethylene glycol to gliadin. That is, the mixing amount of diethylene glycol with respect to 100 parts of gliadin was 20, 25, 30, 35, 4 parts.
A film was prepared by changing it to 0 part (D20, D25,
D30, D35, D40) and the same curve tracer as in Examples 1 to 3 were used to apply a voltage to these films to determine the value of the transmission current. The contact area at that time is 1
The contact force was 0 mm ² , and the contact force was about 500 g. The results are shown in Figure 2.

Example 5 The change in permeation current (change in resistance) was measured by changing the blending ratio of ethylene glycol to gliadin.
That is, films were prepared by changing the blending amount (parts) of ethylene glycol with respect to 100 parts of gliadin, and a voltage of 50 V was applied to these films to determine the value of the permeation current. Results are shown in FIG.

Example 6 The relationship between load voltage and permeation current was measured by changing the type of polyhydric alcohol. That is, a film was prepared by mixing 20 parts of ethylene glycol, 20 parts of diethylene glycol, or 20 parts of glycerin with 100 parts of gliadin (referred to as E20, D20, and G20), and these films were prepared in the same manner as in Example 4. A voltage was applied to and the value of the transmission current was obtained. The results are shown in Fig. 4.

Example 7 The effect of temperature on resistance was measured. That is, 100 parts of gliadin was mixed with 30 parts of ethylene glycol to prepare a film, and heat was applied to the film to measure a change in permeation current (change in resistance). The applied voltage was 25V. Results are shown in FIG.

As is clear from FIG. 5, the resistance decreases as the temperature rises.

Example 8 The change in permeation current (change in resistance) was measured by changing the blending ratio of ethylene glycol to gluten or glutenin. That is, films were produced by changing the blending amount (parts) of ethylene glycol with respect to 100 parts of gluten or glutenin, and a voltage of 10 V was applied to these films to determine the value of permeation current. Results are shown in FIG.

[0025]

As described above, a novel composite material having semiconductivity can be obtained from conventionally known electrically insulating wheat gluten or its component gliadin or glutenin.

[Brief description of drawings]

FIG. 1 is a relationship diagram of a load voltage and a transmission current in a film of an example of the present invention.

FIG. 2 is a relationship diagram of a load voltage and a transmission current in a film of another example of the present invention.

FIG. 3 is a diagram showing the relationship between the blending amount of ethylene glycol and the permeation current (resistance) in the film of still another example of the present invention.

FIG. 4 is a diagram showing a relationship between a load voltage and a transmission current in a film of still another example of the present invention.

FIG. 5 is a relationship diagram of temperature and permeation current (resistance) in the film of still another example of the present invention.

FIG. 6 is a relational diagram of the blending amount of ethylene glycol and the permeation current (resistance) in the film of still another example of the present invention.

FIG. 7 is a relationship diagram between a load voltage and a transmission current in silicon.

Claims (3)

[Claims] 1. A functional composite material comprising gluten and a polyhydric alcohol. 2. A functional composite material comprising gliadin and a polyhydric alcohol. 3. A functional composite material comprising glutenin and a polyhydric alcohol.