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A kind of soluble polyimide containing bistrifluoromethylbenzene substituted asymmetric meta-position structure and its preparation method

A technology of soluble polyimide and trifluoromethylbenzene is applied in the field of soluble polyimide containing bistrifluoromethylbenzene substituted asymmetric meta structure and its preparation, and can solve the problem of reducing the thermal stability of polymers, etc. problem, to achieve the effect of low dielectric constant, simple synthesis and preparation process, and high application value

Active Publication Date: 2022-06-17
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Studies have found that introducing flexible ether bonds and large side group structures into the polyimide molecular structure can effectively improve the polymer's solubility, film-forming properties, optical properties, and dielectric properties, but at the same time reduce the polymer's properties to a certain extent. thermal stability

Method used

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  • A kind of soluble polyimide containing bistrifluoromethylbenzene substituted asymmetric meta-position structure and its preparation method
  • A kind of soluble polyimide containing bistrifluoromethylbenzene substituted asymmetric meta-position structure and its preparation method
  • A kind of soluble polyimide containing bistrifluoromethylbenzene substituted asymmetric meta-position structure and its preparation method

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Embodiment 1

[0042] The present embodiment provides a preparation method of a soluble polyimide film containing bistrifluoromethylbenzene substituted asymmetric meta structure, the steps are as follows:

[0043] (1) In a 100mL dry three-necked flask equipped with nitrogen protection and a condenser, add 1.2810g (4mmol) of diamine monomer 3,5-bis(trifluoromethyl)phenyl-2,4-diamine respectively benzene (its 1 H NMR spectrum as figure 1 shown) and 1.2408g (4mmol) of diphenyl ether tetraacid dianhydride, then add 15mL m-cresol (solid content of the system at 5-20%) and 0.04mmol of isoquinoline in turn, stir at 80 ° C for half an hour After the monomers were completely dissolved, the temperature was raised to 180 °C and the reaction was continued for 10 h to obtain a viscous polymer solution. After the reaction was completed, the polymer solution was poured into ethanol for sedimentation, and further filtered, washed and dried to obtain a fibrous polymer solution containing bistrifluorocarbons...

Embodiment 2

[0046] The present embodiment provides a preparation method of a soluble polyimide film containing bistrifluoromethylbenzene substituted asymmetric meta structure, the steps are as follows:

[0047](1) In a 100mL dry three-necked flask equipped with nitrogen protection and a condenser, add 1.2810g (4mmol) of diamine monomer 3,5-bis(trifluoromethyl)phenyl-2,4-diamine respectively base benzene and 1.2408g (4mmol) of biphtalic dianhydride, then added 18mL of N-methylpyrrolidone (solid content of the system at 5-20%) and 0.12mmol of isoquinoline, and stirred at 90°C for half an hour. After the monomer is completely dissolved, the temperature is continued to be raised to 190 ° C for 6 hours, the reaction is terminated, the polymer solution is poured into ethanol for sedimentation, and further filtered, washed and dried to obtain a fibrous material containing bistrifluoromethylbenzene substituted asymmetric meta-position Structural polyimide polymer, denoted PI b, in 98% yield. The...

Embodiment 3

[0050] The present embodiment provides a preparation method of a soluble polyimide film containing bistrifluoromethylbenzene substituted asymmetric meta structure, the steps are as follows:

[0051] (1) In a 100 mL dry three-necked flask equipped with nitrogen protection and a condenser, 1.2810 g (4 mmol) of the diamine monomer 3,5-bis(trifluoromethyl)phenyl-2,4-diamine were respectively placed base benzene, 1.1769g (4mmol) of benzophenone tetraacid dianhydride, then add 20mL of m-cresol (the solid content of the system is 5-20%) and 0.08mmol of isoquinoline, and stir at 100 ° C for half an hour until the After the polymer was completely dissolved, the temperature was raised to 195 °C and the reaction was continued for 10 h to obtain a viscous polymer solution. After the reaction was completed, the polymer solution was poured into ethanol for sedimentation, and further filtered, washed and dried to obtain a fibrous polymer solution containing bis-trifluoromethane. Benzene-subs...

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Abstract

The invention belongs to the field of high-performance aromatic polymers and the preparation thereof, in particular to a class of soluble polyimides with bistrifluoromethylbenzene-substituted asymmetric meta-structure and a preparation method thereof. The preparation method is as follows: The aromatic diamine monomer containing bistrifluoromethylbenzene substituted asymmetric meta-position structure and the commercial aromatic dianhydride monomer are added into an organic solvent, and under the action of a catalyst, they are stirred and reacted at 180-200°C for 6-10h, After finishing the reaction, further settling, washing and drying, a fibrous soluble polyimide polymer containing bistrifluoromethylbenzene substituted asymmetric meta-position structure can be obtained. The solubility of the polyimide in a specific solvent can reach more than 30 wt%, and it has excellent film-forming properties. The prepared polymer film can be used in the field of microelectronics, and has high potential application value.

Description

technical field [0001] The invention belongs to the field of high-performance aromatic polymers, in particular to a class of soluble polyimides containing bistrifluoromethylbenzene substituted asymmetric meta structure and a preparation method thereof. Background technique [0002] Aromatic polyimides are an important class of high-performance materials originally developed for the aerospace industry. High thermal stability coupled with good mechanical and electrical properties also makes it attractive as interlayer dielectrics, flexible circuit substrates, stress buffers in the microelectronics and optoelectronics industries. With the miniaturization and light weight of microelectronic devices, low dielectric constant has become one of the key factors to minimize power loss and signal transmission delay in microelectronic applications, while commercially available polyimide films have relatively high dielectric constants. The electrical constant (about 3.4-4.0 at 1MHz) is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10C08J5/18C08L79/08
Inventor 汪称意郑慧马燕赵晓燕朱冠南李坚任强
Owner CHANGZHOU UNIV
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