A kind of chiral menthol-based liquid crystal oligomer film and preparation method thereof
A menthol-based and oligomer technology, applied in liquid crystal materials, chemical instruments and methods, etc., can solve the problem of inability to retain color, and achieve the effect of easy industrial production, bright colors, and wide liquid crystal interval.
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Embodiment 1
[0042] Step 1, preparing a chiral menthyl liquid crystal monomer.
[0043] Add 0.10 mol of adipic acid to a 150 mL single-necked bottle, add 30 mL of thionyl chloride, heat up to 64°C, heat to reflux for 6 hours, and distill under reduced pressure to obtain Intermediate 1 after the reaction is complete.
[0044] Move Intermediate 1 to a 250 mL three-neck flask, add 150 mL of chloroform as a solvent, heat to reflux, slowly add 0.10 mol of menthol chloroform solution dropwise, and heat to reflux for 6 hours. After the reaction is completed, filter under reduced pressure to obtain intermediate Body 2.
[0045] Add 0.12mol of p-hydroxybenzoic acid, 200mL of tetrahydrofuran and 0.1mol of pyridine into a 500mL three-neck flask, heat to reflux, slowly add the above intermediate 2 dropwise, and heat to reflux for 6h. After the reaction, cool and filter under reduced pressure, spin the filtrate to dryness, add dichloromethane, heat to reflux for 0.5h, cool and filter. The dichloromet...
Embodiment 2
[0066] Polymethyl hydrogen-containing linear siloxane PMHS, chiral menthyl liquid crystal monomer (M 1 ), (E)-1-(4-(2-(4-(allylcyclohexyl)vinyl)cyclohexyl)-4-methoxybenzene (M 2 ) was dissolved in 50mL xylene, stirred, and 0.8mL tetrahydrofuran solution of hexachloroplatinic acid (5mg·mL -1 ), N 2 Under protection, the temperature was raised to 65°C, and the reaction was carried out for 10 hours. After the reaction, the reaction solution was cooled to room temperature, poured into a beaker filled with about 100mL of methanol, left to stand overnight to precipitate a precipitate, filtered with suction, recrystallized from the filter cake with methanol, and dried to obtain a chiral menthyl liquid crystal oligomer, see Formula VI.
[0067]
[0068] Prepare O1-O8 series of chiral mint-based liquid crystal oligomers according to the above method, and the feed ratio is shown in Table 2 below:
[0069] Table 2 Feed ratio of chiral menthol-based liquid crystal oligomers
[007...
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