Keywords
thermogravimetry
differential scanning calorimetry
How to Cite
Abstract
An evaluation of hydration and thermal decomposition of HAlg and its sodium salt isdescribed using thermogravimetry (TG) and differential scanning calorimetry (DSC). TG curves in
N 2 and air, were obtained for alginic acid showed two decomposition steps attributed to loss of water
and polymer decomposition respectively. The sodium alginate decomposed in three steps. The first
attributed to water loss, followed by the formation of a carbonaceous residue and finally the Na 2 CO 3 .
DSC curves presented peaks in agreement with the TG data. In the IR alginic acid presented bands at
1730 and 1631 cm -1 , while sodium alginate presented a doublet at 1614 e 1431 cm -1 , evidencing the
presence of salified carboxyl groups.
References
X. Liu, L. Qian, T. Shu, Z. Tong, Polym. 44
(2003) 407.
T. A. Davis, B. Volesky, A. Mucci, Water Res.
( 2003) 4311.
C. Jeon, J. Y. Park, Y. J. Yoo, Water Res. 36
(2002) 1814.
A. Haug, B. Larsen, Acta Chem. Scand. 16
(1962) 1908.
G. O. Aspinall, The polysaccharides, Academic
Press, New York, 1983, vol. 2.
S. Oerther, E. Payan, F. Lapicque, N. Presle,
P. Hubert, S. Muller, P. Netter, Biochim. Biophys.
Acta 185 (1999) 1426.
K. Nakamura, E. Kinoshita, T. Hatakeyama,
H. Hatakeyama, Thermochim. Acta 171 (2000)
A. I. Usov, Russ. Chem. Rev. 68 (1999) 957.
A. Ikeda, A. Takemura, H. Ono, Carbohydr.
Polym. 42 (2000) 421.
T. W. Wong, L. W. Chan, S. B. Kho, P. W. S.
Heng, J. Controlled Release 84 (2002) 99.
D. F. Othmer, R. E. Kirk, Encyclopedia of
Chemical Technology, John Wiley, New York,
rd., 1980.
k. Nakamura, Y. Nishimura, H. Hatakeyama,
T. Hatakeyama, Thermochim. Acta 267 (1995)
T. Hatakeyama, H. Hatakeyama, K.
Nakamura, Thermochim. Acta 253 (1995) 137.
A. A. Said, M. M. M. Abd El-Whab, R. M.
Hassan, Thermochim. Acta 233 (1994) 13.
R. Y. M. Huang, R. Pal, G. Y. Moon, J.
Membrane Sci. 160 (1999) 101.
C. K. Yeom, K. H. Lee, J. Appl. Polym. Sci.
(1998) 209.
N. P. Chandía, B. Matsuhiro, A. E. Vásquez,
Carbohydr. Polym. 46 (2001) 81.
E. T. G. Cavalheiro, M. Ionashiro, S. T.
Brevigliere, G. Marino, G. O. Chierice, Quim.
Nova 18 (1995) 305.
W. W. Wendlandt, Thermal Methods of
Analysis, John Wiley. New York, 3rd., 1986.
A. E. Newkirk, I. Aliferis, Anal. Chem. 30
(1958) 982.
This work is licensed under a Creative Commons Attribution 4.0 International License.
Copyright (c) 2018 Eclética Química Journal