Polymer for electrooptical material, dispersed liquid crystal film and method for preparing polymer
A technology of dispersing liquid crystals and electro-optic materials, applied in the al field, can solve the problems of PDLC film hysteresis, high driving voltage, and low ratio, and achieve the effects of improving refractive index matching, increasing display contrast, and reducing interaction force
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Embodiment 1
[0047] A. Add 10 parts of 4-fluorostyrene, 0.0225 parts of dibenzoyl peroxide and 0.225 parts of benzyl-1-propionic acid-trithioester to 10ml of tetrahydrofuran, put it in a 100ml three-necked flask, and bubbling nitrogen for 15min to remove Oxygen in the system. After stirring and reacting in a 90℃~110℃ oil bath for 24h, the macroinitiator RAFT-FPS was obtained after ethanol precipitation, suction filtration and vacuum drying; the number average molecular weight of RAFT-FPS measured by GPC was 6300, and the molecular weight distribution Is 1.32.
[0048] B. Add 0.032 parts of dibenzoyl peroxide, 10 parts of RAFT-FPS prepared in step A and 40 parts of methyl methacrylate (MMA) into 50ml of tetrahydrofuran, and prepare the macroinitiator RAFT under the same conditions as a -FPS-PMMA; The number average molecular weight of RAFT-FPS-PMMA measured by GPC is 25500, and the molecular weight distribution is 1.34.
[0049] C. 50 parts by weight of macroinitiator RAFT-FPS-PMMA, 50 part...
Embodiment 2
[0054] According to the method in Example 1, the macroinitiator RAFT-FPS-PMMA was synthesized and a PDLC film was made. The preparation ratio of the photosensitive solution and the photocuring process are the same as in Example 1. The difference is that the formulation of the synthetic macroinitiator RAFT-FPS is: 4-fluorostyrene 10 parts, dibenzoyl peroxide 0.03 parts, and benzyl-1-propane 0.3 part of acid-trithioester and 10ml of tetrahydrofuran. Electro-optical performance as attached Figure 4 As shown, the driving voltage of the obtained PDLC is 21V, and the on-state light transmittance is 70.6%. The number average molecular weight of the polymer matrix of PDLC measured by GPC was 34,200, and the molecular weight distribution was 1.36.
Embodiment 3
[0056] According to the method in Example 1, the macroinitiator RAFT-FPS-PMMA was synthesized and a PDLC film was made. The preparation ratio of the photosensitive solution and the photocuring process are the same as in Example 1. The difference is that the formula of the synthetic macroinitiator RAFT-FPS-PMMA is: 0.025 parts of dibenzoyl peroxide, 15 parts of macroinitiator RAFT-FPS, 60 parts MMA and 30ml tetrahydrofuran. The driving voltage of the obtained PDLC is 22V, and the on-state light transmittance is 66.3%. The number average molecular weight of the PDLC polymer matrix measured by GPC was 45,700, and the molecular weight distribution was 1.35.
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