Dielectric materials

A polymerizable compound, represented by Formula (1):

• P1-Sp1-(MG-Sp1)m-P1 Formula (1)
• wherein:
• m is an integer from 2 to 60;
• P1 denotes a polymerizable group (P);
• Sp1 denotes at each occurrence
• Sp′-X′;
• Sp′ denotes
• (a) C1-40-straight chain alkylene or C3-40-branched chain alkylene, each of which is optionally mono- or polysubstituted by F, Cl, Br, I or CN and in which, in addition, one or more non-adjacent CH2 groups may each be replaced, independently of one another, by —O—, —S—, —NH—, —NR01—, —SiR01R02—, —CO—, —COO—, —OCO—, —OCO—O—, —S—CO—, —CO—S—, —NR01—CO—O—, —O—CO—NR01—, —NR01—CO—NR01—, or —CH═CH— in such a way that O and/or S atoms are not linked directly to one another, or
• (b) -Spx-G-Spy-, wherein Spx and Spy denote independently of each other C1-20-alkylene or a single bond;
• G denotes C3-20-cycloalkylene which is optionally mono- or polysubstituted by C1-20-alkyl;
• X′ denotes —O—, —S—, —CO—, —COO—, —OCO—, —O—COO—, —CO—NR01—, —NR01—CO—, —NR01—CO—NR01—, —OCH2—, —CH2O—, —SCH2—, —CH2S—, —CF2O—, —OCF2—, —CF2S—, —SCF2—, —CF2CH2—, —CH2CF2—, —CF2CF2—, —CH═N—, —N═C—, —N═N—, —CH═CR01—, —CY01═CY02—, —CH═CH—COO—, —OCO—CH═CH— or a single bond;
• R01 and R02 each, independently of one another, denote H or C1-12-alkyl;
• and
• Y01 and Y02 each, independently of one another, denote H, F, Cl or CN;
• MG is a rod-shaped mesogenic group, which is selected from Formula (2):
• -(A21-Z21)k-A22-(Z22-A23)l- Formula (2)
• wherein:
• A22 is at each occurrence independently of one another an aryl group, heteroaryl group, heterocyclic group, alicyclic group optionally being substituted by one or more identical or different groups L, or a cyclic imide group selected from the group consisting of:
• where one or more H atoms may be replaced by a group L, and/or one or more double bonds may be replaced by single bonds, and/or one or more CH groups may be replaced by N;
• A21 and A23 are independently and at each occurrence independently of one another a cyclic imide group selected from the group consisting of:
• Z21 and Z22 are independently and at each occurrence independently from each other, —O—, —S—, —CO—, —COO—, —OCO—, —S—CO—, —CO—S—, —O—COO—, —CO—NR01—, —NR01—CO—, —NR01—CO—NR02, —NR01—CO—O—, —O—CO—NR01—, —OCH2—, —CH2O—, —SCH2—, —CH2S—, —CF2O—, —OCF2—, —CF2S—, —SCF2—, —CH2CH2—, —(CH2)4—, —CF2CH2—, —CH2CF2—, —CF2CF2—, —CH═N—, —N═CH—, —N═N—, —CH═CR01—, —CY01═CY02—, —C≡C—, —CH═CH—COO—, —OCO—CH═CH—, or a single bond;
• L is F, Cl, Br, I, —CN, —NO2, —NCO, —NCS, —OCN, —SCN, —C(═O)NRxxRyy, —C(═O)ORxx, —C(═O)Rxx, —NRxxRyy, —OH, —SF5, or straight chain alkyl, alkoxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy with 1 to 20 C atoms, or branched chain alkyl, alkoxy, alkylcarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy with 3 to 20 carbon atoms, wherein one or more H atoms are optionally replaced by F or Cl, —CN straight chain alkyl, alkoxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy with 1 to 6 C atoms, or branched chain alkyl, alkoxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy with 3 to 6 carbon atoms;
• Rxx and Ryy independently of each other denote H or alkyl with 1 to 12 C-atoms;
• and
• k and l are each and independently 1, 2, 3 or 4.