Abstract
Fiber properties (fiber swelling ability, crystal structure of cellulose, fiber surface morphology, and etc.) of eucalyptus kraft pulp with different contents of carboxyl group in Na-form were studied. There was a direct proportional relationship between water retention value and carboxyl content of pulp. When the carboxyl content increased from 35.6 to 315.7 mmol/kg, tensile index and burst index increased by 56.1 and 117.8 %, respectively, and crystallinity of cellulose decreased by 11.8 %. Environmental scanning electron microscope showed that more fibrillation was observed on the carboxymethylated fiber surface, compared with the control sample. The results from Fourier transform infrared spectra analysis suggested that the relative intensity of the band at 1,633/cm was increased after carboxymethylation treatment, which showed that the carboxyl content increased. The increase in the carboxyl content not only could increase the fiber strength properties, but also could increase the recycling times of the fiber.
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Acknowledgments
This work was supported by China Postdoctoral Science Foundation (2013M542177, 2013T60807), the National Natural Science Foundation of China (Nos. 31170551 and 31200458), the Ph. D. Program Foundation of Ministry of Education of China (No. 20110172110015), the Foundation for Distinguished Young Talents in Higher Education of Guangdong, China (No. LYM10014) and the Fundamental Research Funds for the Central Universities, SCUT (2013ZZ0031, 2012ZZ0050).
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Chen, Y., Wan, J., Dong, X. et al. Fiber properties of eucalyptus kraft pulp with different carboxyl group contents. Cellulose 20, 2839–2846 (2013). https://doi.org/10.1007/s10570-013-0055-8
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DOI: https://doi.org/10.1007/s10570-013-0055-8