LIQUID CRYSTAL MATERIALS AND DEVICES

摘要

Materials of the following formula (I) are provided: [G]g(SiO1/2)x, wherein G is R3SiR1R2(O)k; R1, R2, R3 are independently selected from C1-16 alkyl which may be partly or fully halogenated, H and formula (IA), wherein Y is selected from COO, OCO, O, S, CHOH, CHF, CH2; Q = (CH2)n wherein one or more non-adjacent methylenes may be replaced by O and n = 1-20; Z is selected from O, S, single covalent bond, COO, OCO; when Y is CH2, then n may also be 0; (a) represents any mesogenic group; provided that at least one of R1, R2, R3, is selected from formula (IA); k = 0 or 1; g = 4 or 6 or 8 or 10 or 12; l = 3 or 8 provided that: if k = 1, l = 3 and x is selected from 6, 8, 10, 12 then g = x; if k = 0, l = 8 and g = 4 then x = 1; and further provided that G may have up to g different structures for any single compound.