Abstract:

In the investigation,the wood fibers from butterfly eucalyptus were oxidized in the 2,2,6,6- tetrameth-ylpiperidine-1- oxyradical (TEMPO) / NaBr/ NaClO oxidization system,and the morphologies and properties of the wood fibers before and after oxidation were characterized by using a fiber quality analyzer (FS300),a dynamic drainage jar (DDJ) and an optical microscope.Then,the oxidized fibers were used to prepare the transparent pa-per,and the effects of the NaClO dosage on the paper properties were discussed.The results show that (1) the in-crease of the NaClO dosage with constant TEMPO and NaBr dosages causes an average fiber length decrease of 0.38mm,an average fiber width increase of 4.7μm,a fine fiber content increase of 8 times and a fiber curl value decrease of 13.9 percentage points as well as a poor pulp drainage property; and (2) as compared with the transparent paper from the wood fibers without the TEMPO treatment,that with the TEMPO treatment achieves a higher tensile strength and a greater elastic modulus with a 5 times tensile index,a 7 times elastic modulus and a 27.0% surface roughness as well as a transparency of 87%.

Key words: TEMPO oxidation system, eucalyptus pulp, transparent paper, transparency, surface roughness.ten-sile index, elastic modulus