Spectral Manifestation of Positive and Negative Photochromism in Polylactide Layers

Linear and branched polylactides were synthesized, and photochromic polymer coatings on their basis were obtained using nitro-substituted indoline spiropyran. Spectral-kinetic experiments showed that these coatings can exhibit both positive and negative photochromism. The character of appearance of photochromism is determined by the content of branched polylactide.