Patent ID: 8551624

Claim:
A copolymer having Formula II: wherein: Ar 1 is the same or different at each occurrence and is an arylene having 6-30 carbons; Ar 2 is the same or different at each occurrence and is an aryl group; Ar 3 is the same or different at each occurrence and is an arylene having 6-30 carbons; R 1 is the same or different at each occurrence and is selected from the group consisting of H, D, aryl groups, alkyl groups, silyl groups, siloxane groups, fluoroalkyl groups, alkoxy groups, and fluoroalkoxy groups; R 2 is the same or different at each occurrence and is selected from the group consisting of D, aryl groups, alkyl groups, silyl groups, siloxane groups, fluoroalkyl groups, alkoxy groups, and fluoroalkoxy groups; M is the same or different at each occurrence and is an aromatic unit having a crosslinkable substituent; a is an integer from 0 to 1; b is an integer from 0 to 3; and x and y are mole fractions such that x+y=1.0, with the proviso that x and y are not zero.