Annals of Warsaw University of Life Sciences - SGGW

In relation to thermal aging of cellulose with/without antioxidant in nitrogen
atmosphere (Table 2) it can be observed that inert gas conditions does not cause significant
changes in cellulose crystallinity index.
Table 2. Crystallinity index (A1430 /A900) of cellulose and cellulose with antioxidant (EQ, PG, THBP) aged in
130ºC in nitrogen atmosphere after 15 days
Sample name A1430 /A900
cellulose (control-unaged) 2.76
cellulose (aged) 2.80
cellulose with THBP (aged) 2.78
cellulose with PG (aged) 2.86
cellulose with EQ (aged) 2.89
CONCLUSIONS
On the basis of the performed studies following conclusions can be drawn:
1. Results obtained indicate that thermal aging of cellulose with/without antioxidant in
oxygen conditions causes increase of cellulose crystallinity. Only for cellulose with PG
and cellulose in non extracted wood changes of crystallinity are not significant.
2. Degradation of cellulose in the presence of THBP and EQ in 130ºC – air atmosphere
proceeds mainly in amorphous regions. Addition of PG to cellulose matrix favors
proceeding thermal cellulose degradation both in amorphous and crystalline regions.
For cellulose in non extracted wood similar results were obtained.
3. Thermal aging of cellulose with/without antioxidant in nitrogen atmosphere does not
cause significant changes in cellulose crystallinity index.
REFERENCES
1. M.L. NELSON, R.T. O’CONNOR, Relation of certain infrared bands to cellulose
crystallinity and crystal lattice type. Part I. Spectra of lattice types I, II, III and
amorphous cellulose, J. Appl. Polym. Sci. 8 (1964 a) 1311-1324.
2. M.L. NELSON, R.T. O’CONNOR, Relation of certain infrared bands to cellulose
crystallinity and crystal lattice type. Part II. A new infrared ratio for estimation of
crystallinity in cellulose I and II, J. Appl. Polym. Sci. 8 (1964 b) 1325-1341.
3. ANTCZAK, A. RADOMSKI, J. ZAWADZKI, Benzene Substitution in Wood
Analysis, Annals of Warsaw Agricultural University, Forestry and Wood Technology
58 (2006) 15-19.
4. D. KRUTUL, �wiczenia z chemii drewna oraz wybranych zagadnie� chemii
organicznej, SGGW, Warszawa, 2002.
5. ANTCZAK, A. RADOMSKI, J. ZAWADZKI, Determination of antioxidants in
cellulose matrix, Annals of Warsaw University of Life Sciences, Forestry and Wood
Technology 61 (2007) 15-19.
6. R.T. O’CONNOR, Infrared absorption spectroscopy in the evaluation of cellulose and
cellulose derivatives, Tappi 52 (1969) 566-572.
7. N.I. KLENKOVA, Struktura i reakcjonnaja sposobnost’ cellulozy, Leningrad, 1976,
pp. 31-52.
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