Advanced Functional Materials

June 07, 2002

Optical security...

Useful optical security features, such as photopatterning, easily detectable optical anisotropy, and irreversible color change are displayed by polymer films fabricated by Schmidt and co-workers, i.e., oriented polydiacetylene incorporated in a polyethylene matrix. The optical anisotropy of these films—prepared via gel processing and subsequent tensile drawing—is demonstrated to be dependent on the draw ratio and concentration and form of polydiacetylene in the matrix. (H.-W. Schmidt et al., June 18, Adv. Funct. Mater. 2002, 12, 441–446)

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