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  • Title: Photochromic paper from wood pulp modification via layer-by-layer assembly of pulp fiber/chitosan/spiropyran.
    Author: Tian X, Wang B, Li J, Zeng J, Chen K.
    Journal: Carbohydr Polym; 2017 Feb 10; 157():704-710. PubMed ID: 27987981.
    Abstract:
    Cellulosic fiber introducing with photochromic properties can be used in many fields such as security packaging, printing paper, and rewritable paper. To introduce photochromic property to individual fiber, a polyelectrolyte composite layer composed of cationic chitosan (CS) and anionic carboxyl-containing spiropyran (SPCOOH) on pulp fibers was designed using layer-by-layer assembly technique. Scanning electron microscope observation showed that the SPCOOH was successfully absorbed onto the surface of fiber. The photochromic characteristic of LbL-treated fiber could be triggered by UV-vis absorption spectrum and the LbL-treated fibers had a good compatibility with pulp fibers. This study gives a highly effective method to impart the photochromic characteristic to paper.
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