| 摘要 |
The invention is a series of amorphous copolymers which, used in association with a small molecule, provide photorefractive materials that can be used in optical signal processing. These copolymers contain an active non-linear optical group and a group which contributes to their photoconductivity. <IMAGE> where: X is H, CH3, Cl or F Y is H, CH3, Cl or F 2</=n</=4 2</=m</=4 The electron-donor group D being:-O-, -S-, <IMAGE> or -COO- The electron-acceptor group Ae being: -CN, -NO2, <IMAGE>
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