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Film of polyimide containing color base group, and preparation method

A technology of polyimide film and chromophore, which is applied in the field of polyimide film containing chromophore and its preparation, can solve the problems of pores, difficulties in obtaining high-quality polyimide materials, and difficult volatilization And other issues

Inactive Publication Date: 2007-05-09
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many kinds of polyimides, and there are also multiple ways in the synthesis. The most commonly used method at present is the solution method (Strunskus T., Grunze M., Polyimides, Dekker, New York, 1996: 187), but the solution method also has some Deficiency, the synthetic reaction of polyimide prepared by solution method is carried out in high-boiling aprotic solvents such as dimethylformamide (DMF), N-methylpyrrolidone (NMP), and in the polyimide thin film During the preparation process, these high-boiling aprotic solvents are difficult to volatilize completely, and at the same time, volatiles are released during the cyclization (imidization) of polyamic acid, which is easy to generate pores in the material, and it is difficult to obtain high-quality, non-porous polyimide material

Method used

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  • Film of polyimide containing color base group, and preparation method
  • Film of polyimide containing color base group, and preparation method
  • Film of polyimide containing color base group, and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The raw materials used are as follows:

[0024] Pyromellitic dianhydride (PMDA), a commercially available product.

[0025] 2,4-Diamino-4'-nitroazobenzene (DAB) was synthesized according to references (Balcerzak E.S., Sapich B., Stumpe J., Polymer, 2005, 46:49).

[0026] The ratio of raw materials used is as follows:

[0027] 1.1 parts of pyromellitic dianhydride (PMDA) (number of moles)

[0028] 1 part of 2,4'-diamino 4'-nitroazobenzene (DAB) (moles)

[0029] Preparation of PMDA-DAB type PI membrane:

[0030] Put PMDA and DAB on two copper heating boats respectively, and control the temperature of the two to 170°C and 150°C (at the same time) respectively through the transformer. The system vacuum is higher than 1×10 -3 Pa, while evaporating for 20-30 minutes, the prepolymer polyamic acid film of polyimide is polymerized and deposited on the substrate. Then put the polyamic acid film deposited on the substrate into a vacuum oven for heat treatment, the temperatur...

Embodiment 2

[0037] The raw materials used are as follows:

[0038] 2,2'-bis(4-dicarboxyphenoxyphenyl)propane dianhydride (BSAA), a commercial product.

[0039] 2,4-Diamino-4'-nitroazobenzene (DAB), prepared as described in Example 1.

[0040] The ratio of raw materials used is as follows:

[0041] 2,2'-bis(4-dicarboxyphenoxyphenyl)propane dianhydride (BSAA) 1.1 parts (number of moles)

[0042] 2,4-diamino-4'-nitroazobenzene (DAB) 0.9 parts (moles)

[0043] Preparation of BSAA-DAB-PI membrane:

[0044] Put BSAA and DAB on two copper heating boats respectively, and control the temperature of the two to 255°C and 150°C (at the same time) respectively through a transformer. The system vacuum is higher than 1×10 -3Pa, while evaporating for 20-30 minutes, the prepolymer polyamic acid film of polyimide is polymerized and deposited on the substrate. Then put the polyamic acid film deposited on the substrate into a vacuum oven for heat treatment, the temperature is 250° C., the heat treatmen...

Embodiment 3

[0047] The raw materials used are as follows:

[0048] 3,3',4,4'-Biphenyltetracarboxylic dianhydride (BPDA), a commercially available product.

[0049] 2,4-Diamino-4'-nitroazobenzene (DAB), prepared as described in Example 1.

[0050] The ratio of raw materials used is as follows:

[0051] 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA) 1.1 parts (moles)

[0052] 2,4-diamino-4'-nitroazobenzene (DAB) 0.8 parts (moles)

[0053] Preparation of BPDA-DAB type PI membrane:

[0054] Put BPDA and DAB on two copper heating boats respectively, and control the temperature of the two to 260°C and 150°C (at the same time) respectively through the transformer. The system vacuum is higher than 1×10 -3 Pa, while evaporating for 20-30 minutes, the prepolymer polyamic acid film of polyimide is polymerized and deposited on the substrate. Then put the polyamic acid film deposited on the substrate into a vacuum oven for heat treatment, the temperature is 200°C, the heat treatment time i...

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Abstract

This invention relates to a method for preparing polyimide thin film containing chromophore. The polyimide thin film, prepared by vapor deposition polymerization, can retain good thermal stability and chemical stability as that prepared by traditional method, and has such advantages as high uniformity, high compactness, no pin holes, no need for catalyst, no residual solvent, high purity and simple process. The polyimide thin film is suitable for fabricating photoelectrical devices such as optical switch.

Description

technical field [0001] The invention belongs to the technical field of functional macromolecular materials, and in particular relates to a new polyimide film containing chromogenic groups and a preparation method thereof. Background technique [0002] Polyimide (PI) as a functional polymer material, due to its good thermal properties (the decomposition temperature of fully aromatic polyimide is generally around 500 ° C), excellent mechanical properties, stable chemical properties and Good dielectric properties, widely used in aerospace, microelectronics, nano, liquid crystal, separation membrane and other fields. There are many kinds of polyimides, and there are also multiple ways in the synthesis. The most commonly used method at present is the solution method (Strunskus T., Grunze M., Polyimides, Dekker, New York, 1996: 187), but the solution method also has some Deficiency, the synthetic reaction of polyimide prepared by solution method is carried out in high-boiling apr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L79/08C08G73/10
Inventor 浦鸿汀李媛媛万德成
Owner TONGJI UNIV
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