A photoactive polymer from the class of polyimides, polyamide acids and esters thereof comprises as a side-chain a photocrosslinkable group of the general formula (I)
1
wherein the broken line indicates the point of linkage to the polyimide main chain and wherein: B is a straight-chain or branched alkyl residue which is optionally substituted, wherein one or more non-adjacent CH
2
groups may independently be replaced by a group Q; D represents an oxygen atom or —NR
1
— wherein R
1
represents a hydrogen atom or lower alkyl; and S
3
represents a spacer unit. The polymers may be used as orientation layers for liquid crystals and in the construction of unstructured and structured optical elements and multi-layer systems.
一种来自聚
酰亚胺、聚酰胺酸及其
酯类的光敏聚合物,其侧链包含一个光交联可交联基团,其通用式为(I)1,其中断裂的线表示与聚
酰亚胺主链的连接点,并且:B是直链或支链烷基残基,可选地被取代,其中一个或多个非相邻的
CH2基团可以独立地被取代为基团Q;D表示氧原子或—NR1—,其中R1表示氢原子或低烷基;S3表示间隔单元。这些聚合物可用作液晶的取向层,并用于构建非结构化和结构化光学元件和多层系统。