Abstract:

The bleached eucalyptus pulp and waste newspapers were used as raw materials to prepare oxidized nanocellulose by 2, 2, 6, 6-Tetramethylpiperidine-1-oxyl (TEMPO)/NaBr/NaClO oxidation system, and the effects of the addition amounts of two oxidized nanocellulose on paper properties were investigated in this study. The results showed that the average fiber length and aspect ratio of eucalyptus oxidized nanocellulose(75-95 nm, 6.5-8.5) were both higher than that of waste newspaper oxidized nanocellulose(45-75 nm, 4-6). The tensile index of the eucalyptus and waste newspaper oxidized nanocellulose paper increased from 21.16 (N·m)/g to 31.37 and 27.22 (N·m)/g, the burst index increased from 1.32 (kPa·m²)/g to 1.84 and 1.79 (kPa·m²)/g, and the tear index increased from 6.61 (mN·m²)/g to 8.03 and 8.12 (mN·m²)/g. It was more helpful to improve the paper strength by the two kinds of oxidized nanocellulose by the addition of cationic starch. The tensile index of paper was increased by 51.09%, the burst index 50.00%, and the tear index 27.62%.

Key words: TEMPO oxidation, eucalyptus wood pulp, waste newspaper, paper intensifier, nanocellulose