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Starch-based conductive composite film built on basis of ionic liquid enhanced starch phase change, method and application

An ionic liquid, starch-based technology, applied in the field of conductive polymer composite materials, to achieve the effects of reducing energy consumption, excellent application prospects, and short construction time

Active Publication Date: 2016-03-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there have been no reports on the use of ionic liquids to enhance the phase transition of starch in a lower temperature range, and based on this to create and construct starch-based conductive composite materials with lower temperature and excellent electrical conductivity.

Method used

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  • Starch-based conductive composite film built on basis of ionic liquid enhanced starch phase change, method and application
  • Starch-based conductive composite film built on basis of ionic liquid enhanced starch phase change, method and application
  • Starch-based conductive composite film built on basis of ionic liquid enhanced starch phase change, method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Add an appropriate amount of ionic liquid 1-ethyl-3-methylimidazole acetate to deionized water to obtain an ionic liquid-water solution with a concentration of 0.15:1mol / mol, which is an ionic liquid-water solution according to the quality of dry starch 70% ratio, add cornstarch with a water content of 10%. Based on the strengthening effect of the ionic liquid solution on the disordering of the starch structure, the corn starch-ionic liquid colloidal composite system was obtained after the starch was phase-transformed at 26°C for 1 h.

[0022] (2) Place the colloidal substance of the ionic liquid-water-starch obtained in step (1) on the mold and use a pressure molding machine to form it under a pressure of 6MPa and a temperature of 55°C for 0.5h, and balance it under a 75% humidity environment After obtaining the starch-ionic liquid conductive composite conductive film with a thickness of about 1mm and good transparency (see attached figure 1 ), as can be seen from...

Embodiment 2

[0026] The difference between this embodiment and embodiment 1 is:

[0027] (1) Concentration of ionic liquid-water solution: 0.20:1mol / mol;

[0028] The ratio of dry starch mass to ionic liquid-water solution: 120%;

[0029] Moisture content of potato starch: 18%;

[0030] Strengthening conditions: temperature 32°C, time 1.5h.

[0031] (2) Place the colloidal substance of the ionic liquid-water-starch obtained in step (1) on the mold and use a pressure molding machine to form it under a pressure of 10MPa and a temperature of 45°C for 1.5h, and balance it in a 33% humidity environment Finally, a starch-ionic liquid conductive composite conductive film with a thickness of about 1mm and good transparency was obtained. From the detailed parameters in Table 2, it can be seen that the material has good electrical conductivity, mechanical properties and degradation properties, and presents a good application prospect.

[0032] Table 2

[0033]

Embodiment 3

[0035]The differences between this embodiment and Embodiment 1 are:

[0036] (1) Concentration of ionic liquid aqueous solution: 0.15:1mol / mol;

[0037] The ratio of dry base starch quality to ionic liquid-water solution: 100%;

[0038] Moisture content of tapioca starch: 15%;

[0039] Strengthening conditions: temperature 35 ℃, time 2h.

[0040] (2) Place the colloidal substance of the ionic liquid-water-starch obtained in step (1) on the mold and use a pressure molding machine to mold it under a pressure of 8MPa and a temperature of 65°C for 1h, and equilibrate it under a 33% humidity environment A starch-ionic liquid conductive composite conductive film with a thickness of about 1 mm and good transparency was obtained. It can be seen from the detailed parameters in Table 3 that the material has excellent electrical conductivity, mechanical properties and degradation properties, and presents a good application prospect.

[0041] table 3

[0042]

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Abstract

The invention discloses a starch-based conductive composite film built on the basis of ionic liquid enhanced starch phase change, a method and application. The preparation method includes the following steps that firstly, a 1-ethyl-3-methyl imidazole acetate ionic liquid aqueous solution is prepared, the molar ratio of ionic liquid to water ranges from 0.15:1 to 0.20:1, starch is added, the mass of dry basis starch accounts for 70-150% of the ionic liquid aqueous solution, and colloidal starch subjected to phase change is obtained after 1-3 hours of reinforcing; secondly, the colloidal starch obtained in the first step is placed on a mould and subjected to forming processing for 0.5-1.5 hours at the pressure of 6-10 MPa through a pressure forming machine, and the starch-based conductive composite film is obtained after balance is performed in the 33-75% humidity environment. According to the material, on one hand, conductivity is good and plasticizer is not needed; on the other hand, building temperature is low, and the composite film is applicable to the fields of biosensors and other biomedical materials.

Description

technical field [0001] The invention relates to the field of conductive polymer composite materials, in particular to a starch-based conductive composite material with low construction temperature and complete biodegradation, which is suitable for the fields of biosensors and biomedical materials, and to a construction method of the material. Background technique [0002] Conductive polymer material refers to a polymer with a conjugated π bond conductive structure or a type of conductive material obtained by combining a polymer substrate with a conductive functional component by a certain means. Compared with metal materials, it has Light weight, easy processing, and possible electrical and optical properties can be used in biosensors, tissue engineering, light-emitting diodes, electrode materials, photovoltaic materials and other fields. Traditional conductive polymers are often obtained through chemical synthesis methods, mainly involving polyacetylene, polyphenylene, poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/02C08K5/3445B29C43/00B29K96/00
CPCB29C43/003B29K2096/00C08J5/18C08J2303/02C08K5/3445C08L2201/06C08L2201/10C08L2203/02C08L2203/16C08L3/02
Inventor 张宾佳陈玲谢丰蔚李晓玺
Owner SOUTH CHINA UNIV OF TECH
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