Citation:
LI Dong-Xu, SHANG Xin, LI Ying-Juan, QIAN Cheng, CHEN Jie, REN Xiao-Dong, YANG Bai-Quan. Analysis of Structure and Composition of Ageing Newspaper[J]. Chinese Journal of Analytical Chemistry,
;2021, 49(11): 1890-1896.
doi:
10.19756/j.issn.0253-3820.201618
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The analysis of degree of aging paper is an important research topic in the field of identification of physical evidence. The rule of the structure and composition in aging paper of People's daily from 1966 to 2015 were investigated by Fourier transform infrared spectroscopy (FTIR), X-ray crystal diffraction, scanning electron microscope (SEM), atomic force microscope (AFM) and ion chromatography in this work. The result of FTIR showed that the characteristic peaks of -OH (3000-3600 cm-1), -C-H (2925-3000 cm-1) got weak in the ageing process, which indicated the intramolecular and intermolecular forces of cellulose weakening gradually. The result of X-ray crystal diffraction showed that the crystallinity of paper decreased from 80.6% in 2015 to 71.2% in 1966. The structure of paper in 2015 was neat and smooth according to the results of SEM. SEM was used to observe the surface of paper and found that the microstructure of paper gradually broke and sunken as time. The result of AFM showed that the fiber structure on the surface of paper was gradually fragmented in the aging process. The contents of potassium ion, sodium ion, phosphate ion and chloride ion in paper of different ages were determined by ion chromatography, and found thatthe content of sodium ion decreased gradually, while the contents of other ions increased in the ageing process. The experimental results showed that the micro-structure and composition of newspaper changed regularly with the prolongation of storage time, which could provide evidence for the identification of aging paper.
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