Big tilt angle silicon-containing alkyl polyimide liquid crystal orientation film and method for making same

A technology containing silane-based polyimide and silane-based polyimide, which can be applied in nonlinear optics, instruments, optics, etc., can solve the problems of lack of molecular structure tunability, few types of synthetic raw materials, etc., and achieve liquid crystal orientation. Good uniformity, low cost and good coating performance

Inactive Publication Date: 2009-04-29
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the side group structure of steroids is relatively fixed, lacks the adjus

Method used

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  • Big tilt angle silicon-containing alkyl polyimide liquid crystal orientation film and method for making same
  • Big tilt angle silicon-containing alkyl polyimide liquid crystal orientation film and method for making same
  • Big tilt angle silicon-containing alkyl polyimide liquid crystal orientation film and method for making same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) The chemical reaction formula of 4'-(tert-butyldimethylsilyloxy) biphenyl-3,5-diaminobenzoate (DPA) is as follows:

[0040]

[0041]

[0042] a. Preparation of 3,5-dinitrobenzoyl chloride

[0043] Add 21.2g (0.1mol) of 3,5-dinitrobenzoic acid into a three-necked flask with a stirrer, a thermometer and a reflux condenser, inject 100ml of thionyl chloride (SOCl 2 ), heated to reflux under stirring, when no tail gas was emitted, excess SOCl was evaporated at normal pressure 2 , to obtain 3,5-dinitrobenzoyl chloride.

[0044] b. Preparation of 4'-(hydroxy)biphenyl-3,5-dinitrobenzoate

[0045] The above 23.05 g (0.1 mol) of 3,5-dinitrobenzoyl chloride was dissolved in 50 ml of tetrahydrofuran (THF) for use. Another 24g (0.13mol) of 4,4'-dihydroxybiphenyl was dissolved in 100ml of THF, and 8ml (0.1mol) of pyridine was added as an acid absorbing agent, and the above acid chloride solution was slowly added dropwise to 4,4 '-dihydroxybiphenyl THF solution, reacted ...

Embodiment 2

[0068] 3mol 4"-(tert-butyldimethylsilyloxy)benzoyloxyphenyl-3,5-diaminobenzoate (EPA), 7mol ODA and 10mol 3,3',4,4' - Dissolve biphenyltetracarboxylic dianhydride (BPDA) in 50mol NMP, react under nitrogen protection at a temperature of 10°C for 24 hours, and dilute the formed polymer solution to 5% with γ-butyrolactone to obtain a polyamic acid solution. Film is coated in the same way in Example 1 (3), then solidified at a temperature of 250°C for 1 hour to obtain a polyimide liquid crystal alignment film and make a liquid crystal cell.Adopt the crystal rotation method to test the pretilt angle, and confirm the liquid crystal under a polarizing microscope The uniformity of liquid crystal orientation in the cell, the results are shown in Table 1.

Embodiment 3

[0070] 4mol 4'-(tert-butyldimethylsilyloxy)biphenyl-3,5-diaminobenzoate (DPA), 6mol p-phenylenediamine and 10mol 3,3',4,4' Dissolve biphenyltetracarboxylic dianhydride (BPDA) in 50 mol of NMP, react under nitrogen flow at a temperature below 10°C for 12 hours, and dilute the formed polymer solution to 5% with NMP to obtain a polyamic acid solution. The film was coated in the same manner as in Example 1 (3), and then cured at a temperature of 230° C. for 3 hours to obtain a polyimide liquid crystal alignment film, which was then fabricated into a liquid crystal cell. The pretilt angle was tested by the crystal rotation method, and the uniformity of the liquid crystal orientation in the liquid crystal cell was confirmed under a polarizing microscope. The results are shown in Table 1.

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Abstract

The invention relates to a silyl-containing polyimide liquid crystal alignment film with a large pre-tilt angle and a preparation method thereof. The silyl-containing polyimide liquid crystal alignment film is characterized by being prepared by the following steps and conditions: (1) adding 3-10 mol parts of silyl-containing diamine, 0-7 mol parts of organic diamine and 20-50 mol parts of an organic solvent to a reactor with a stirrer and a thermometer, adding 10 mol parts of tetracarboxylic dianhydride at 0-10 DEG C after dissolving the diamine under the protection of nitrogen, and reacting for 12-24h to obtain polyamic acid solution; (2) coating the polyamic acid solution on ITO glass, and curing at 180-250 DEG C for 1-3h to obtain the silyl-containing polyimide liquid crystal alignment film with the large pre-tilt angle. When the alignment film is used for preparing LCDs, the pre-tilt angle of liquid crystal molecules increases along with the increase in content of silyl-containing side chains in the polyimide, and the pre-tilt angle is 20-90 degrees.

Description

technical field [0001] The invention relates to a large pre-tilt angle polyimide liquid crystal alignment film containing a silyl group and a preparation method thereof, belonging to the field of polymer liquid crystal display materials. Background technique [0002] Liquid crystal displays (LCDs) have become important display elements in many electronic products. As one of its important components, the liquid crystal alignment film determines the arrangement of liquid crystal molecules inside the display device, and directly affects performance parameters such as device contrast and chromaticity. Polyimide (PI) material has become the most widely used alignment film material in LCD due to its excellent comprehensive properties: excellent mechanical properties, high temperature resistance, low dielectric loss, good orientation adaptability, and easy operation. one. [0003] With the continuous development of LCD technology, the performance requirements for polyimide liquid...

Claims

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Application Information

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IPC IPC(8): G02F1/1337
Inventor 顾宜赖华刘向阳朱蓉琪盛兆碧
Owner SICHUAN UNIV
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