The accelerated aging of the papers prepared from the virgin fiber and the recycled fiber in different weight ratios was investigated in terms of brightness and MIT folding endurance. The results show that the recycled fiber did not cause significant losses in paper brightness, but resulted in great decreases in MIT folding endurance of the papers. The Raman spectra of the two fibers indicate that there were not large changes in the formation of the chromophores responsible for color of the papers and the degradation of cellulose and hemicellulose in the fiber during the cycling. The Py-GC analyses of the fibers illustrate that a large amount of rosin sizes and/or polyacrylamides remained in the recyded fiber, which interfered the formation of hydrogen bonds among the fibers so that the folding endurance of the formed papers were small. The crystallinity of the recycled fiber was larger than that of the virgin fiber, and did not change very much during the accelerated aging. This may be another explanatiion for the small folding endurance of the papers containing the recycled fiber.
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