Terpolymerized side chain type liquid crystal polymer and preparation method thereof
A technology of side-chain liquid crystals and polymers, applied in the direction of liquid crystal materials, chemical instruments and methods, etc.
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Embodiment 1
[0030] This embodiment is for the preparation of [6-(4-methoxyazophenyl-4'-oxygen) hexyl] methacrylate, i.e. azobenzene monomers, azobenzene monomers of different side chain lengths ( The synthesis process of n=2-9) is the same, taking n=6 as an example, its structural formula is:
[0031]
[0032] This embodiment specifically includes the following steps:
[0033] Step 1, synthetic 4-hydroxyl-4'-methoxy azobenzene, its structural formula is:
[0034] Specifically:
[0035] 1.1) Add 4-methoxyaniline (12.32g, 100mmol) and 100mL aqueous hydrochloric acid (HCl and H 2 (2 volume ratio is 1:4), vigorously stirred under ice-water bath;
[0036] 1.2) Add 20 mL of NaNO dropwise to the above solution 2 (7.00g, 101mmol) aqueous solution, control reaction temperature 0-5 ℃;
[0037] 1.3) Add phenol (9.40 g, 100 mmol) and 50 mL of 10% NaOH solution in a 500 mL beaker, and stir to dissolve. Under an ice-water bath, the above prepared diazonium salt solution of p-methoxyaniline w...
Embodiment 2
[0047] This embodiment is to prepare N-benzyloxymaleimide and the azobenzene monomer synthesized in Example 1 and the side chain type liquid crystal polymer copolymerized with methyl methacrylate, and its structural formula is:
[0048] Wherein: x, y, z are respectively the mol ratio of monomer methyl methacrylate, N-benzyloxymaleimide and azobenzene monomer three feed intake, and in the present embodiment x, y, When z is 0.05, 0.15, and 0.8, respectively, the thermal and optical properties of the polymer are the best. The glass transition temperature of the polymer corresponding to this ratio is 119°C, and the material parameter pretilt angle that characterizes the orientation of liquid crystal is 3.6°.
[0049] The specific steps of this embodiment are as follows:
[0050] Step 1, synthetic N-benzyloxymaleimide, its structural formula is:
[0051] Specifically:
[0052] 1.1) Add maleic anhydride (1.961 g, 0.02 mmol) into a beaker, add 200 mL of chloroform, and stir to ...
Embodiment 3
[0059] This embodiment is to prepare N-phenylmaleimide and the azobenzene monomer synthesized in Example 1 and the side chain type liquid crystal polymer copolymerized with methyl methacrylate, and its structural formula is:
[0060] Where: x, y, z are respectively the molar ratios of monomer methyl methacrylate, N-phenylmaleimide and azobenzene monomer.
[0061] Step 1, synthetic N-phenylmaleimide, its structural formula is:
[0062] Specifically:
[0063] 1.1) Add maleic anhydride (1.961 g, 0.02 mmol) into a beaker, then add 200 mL of chloroform, and stir to dissolve. Aniline (1.862g, 0.02mmol) was added into a 500mL three-necked flask while 200mL of chloroform was added, magnetic stirring was turned on, and it was placed in an ice-water bath. Add the chloroform solution of maleic anhydride to the three-necked flask drop by drop, and react at 0-5°C for 30 minutes after the drop is complete;
[0064] 1.2) After the reaction is finished, the crude product is obtained by...
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