| abstract |
The invention provides a polymer comprising at least one unit of the formula: n n n Where n is 0 or 1, m and p are independently 0, 1, 2, 3, 4, 5 or 6, and the restriction is that the sum of n, m and p is at least 2, and n and p are not 0, Ar 1 and Ar 2 are each independently a C 6-14 aryl group or a C 6-14 aryl group, which may be substituted with 1 to 4 substituents, and the (and other) substituents are independently selected from C 1- A group consisting of 30 alkyl groups, C 2-30 alkenyl groups, C 2-30 alkynyl groups, C 5-8 cycloalkyl groups, C 6-14 aryl groups, and 5 to 14-membered heteroaryl groups, and X 1 , X 2 And X 3 are independent of each other and are O or S on each occurrence, a composition comprising these polymers and an electronic device comprising a layer formed from these compositions. Preferably, the electronic device is an organic field effect transistor and the layer is a dielectric layer. |