Paper Doped with Polyacrylonitrile Fibres Modified with 10,12-Pentacosadiynoic Acid

This work reports a modification of a fibrous cellulose material (paper) by the addition of polyacrylonitrile (PAN) fibres doped with 10,12-pentacosadiynoic acid (PDA). The fibres are sensitive to ultraviolet (UV) light. When the paper containing PAN-PDA is irradiated with UV light it changes colour to blue as a consequence of interaction of the light with PDA. The colour intensity is related to the absorbed dose, content of PAN-PDA fibres in the paper and the wavelength of UV radiation. The features of the paper are summarised after reflectance spectrophotometry and scanning microscopy analyses. All the properties of the modified paper were tested in accordance with adequate ISO standards. Moreover, a unique method for assessing the unevenness of the paper surface and the quality of printing was proposed by using a Python script (RGBreader) for the analysis of RGB colour channels. The modification applied to the paper can serve as a paper security system. The modified paper can act also as a UV radiation indicator.

Automated summary

This study reports a modification of paper by adding PAN-PDA fibers, making it sensitive to UV light and changing its color to blue. The color intensity is related to absorbed dose, fiber content, and UV radiation wavelength, with features summarized through spectrophotometry and microscopy. The modified paper can serve as a security system and UV radiation indicator.