Polyimide alignment film with synergistic azo alignment of liquid crystal cells and preparation method thereof
A polyimide, oriented film technology, applied in the direction of liquid crystal materials, chemical instruments and methods, instruments, etc., can solve the problems of limited application, generation of dust, static electricity and scratches, negative impact on the quality of liquid crystal devices, etc., to achieve the synthesis process. Simple to use effects
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Embodiment 1
[0042] This embodiment is a diamine monomer, the chemical name of the diamine monomer is 4,6-diamino-2-cyanobiphenylpyrimidine, and the structural formula is:
[0043]
[0044] This diamine monomer obtains through the following steps:
[0045] 1. Synthesis of 1-bromo-6-(4-cyanobiphenyl-4`-oxygen) hexane: add 4-cyano-4`-hydroxyl in sequence to a three-necked flask equipped with a magnet, a thermometer and a condenser Biphenyl (4.0132g, 20.5mmol), 1,6-dibromohexane (40.8135g, 169.1mmol), anhydrous potassium carbonate (7.1723g, 50.9mmol), catalytic amount of potassium iodide and 140mL acetone, stirring under nitrogen protection reflow. Spin the acetone to dryness, add ethyl acetate to redissolve, filter, and evaporate most of the solvent from the filtrate, then add an appropriate amount of petroleum ether to produce a large amount of precipitate, collect it by filtration, dry it in vacuum, and recrystallize the crude product in ethanol;
[0046] 2. Synthesis of diamines with...
Embodiment 2
[0049] This embodiment is a polyimide prepared from the cyano-containing biphenyl diamine monomer and azodiamine monomer described in Example 1, and its structural formula is:
[0050] This polyimide obtains through the following steps:
[0051] One, feed nitrogen into the reactor equipped with mechanical stirring, nitrogen inlet and outlet and thermometer, diamine monomer (2.2613g, 5mmol) of azo structure, diamine monomer (2.0959g) of cyanobiphenyl structure , 5mmol) and pyromellitic dianhydride (PMDA) monomer (2.1812g, 10mmol) were dissolved in 15.3623g N,N-dimethylacetamide (DMAc), reacted at 10°C for 8h to obtain polyamic acid solution;
[0052] 2. Coat the polyamic acid solution at a speed of 3cm / s, pre-bake at 50°C for 2h, then keep the pre-baked film at 90°C for 2h, 120°C for 2h, 200°C for 2h, 250°C ℃ for 2h, and finally polyimide is obtained, and the differential scanning calorimetry (DSC) curve of polyimide is as follows: image 3 shown.
Embodiment 3
[0054] This embodiment is a polyimide prepared from the cyano-containing biphenyl diamine monomer and azodiamine monomer described in Example 1, and its structural formula is:
[0055] This polyimide obtains through the following steps:
[0056] One, feed nitrogen into the reactor equipped with mechanical stirring, nitrogen inlet and outlet and thermometer, diamine monomer (1.8088g, 4mmol) of azo structure, diamine monomer (2.5151g) of cyanobiphenyl structure , 6mmol) and diphenyl ether tetra-acid dianhydride (ODPA) monomer (3.1020g, 10mmol) were dissolved in 17.2746g N-methylpyrrolidone (NMP), and reacted at 12°C for 10h to obtain a polyamic acid solution;
[0057] 2. Coat the polyamic acid solution at a speed of 3.5cm / s, pre-bake the film at 50°C for 2.5h, then keep the pre-baked film at 90°C for 2.5h, 120°C for 2.5h, and 200°C Keep warm for 2.5h, keep warm at 250°C for 2.5h, and finally get polyimide, the thermal weight loss curve of polyimide is as follows Figure 4 sh...
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