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The Orientation Stability and UV Irradiation of Poly(hexa‐2,4‐diynilene‐1,6‐dioxy)benzoates and Cinnamates Containing Disperse Red 19

The poling and orientation parameters of the four polymers para and meta benzoates and cinnamates containing Disperse Red 19 dye were studied. The para polymers were found to be orientated more efficiently, and their stabilities were much better than the meta polymers. The photobleaching takes place when irradiated at temperatures around Tg, but did not occur when irradiated under the poling conditions. After the photo cross‐linking at around Tg the orientation maintenance of the para polymers were found to be almost indefinite. The stability of the para polymers is considered to be due to their stable main chain conformation when poled.