Res. Chem. Intermed.
, Vol. 27, No. 7,8, pp. 837–845 (2001)
Radiation activation of cotton-cellulose prior
to alkali treatment
, L. WOJNÁROVITS
, CS. FÖLDVÁRY
and I. SAJÓ
Institute of Isotope and Surface Chemistry, CRC, HAS, Budapest, Hungary
Budapest University of Technology and Economics, Budapest
Institute of Chemistry, CRC, HAS, Budapest
Abstract—The effect of alkali treatment on preirradiated cotton-cellulose was investigated using
diffuse re ectance Fourier transformed infrared spectroscopy (DRIFT) and X-ray diffraction (XRD).
The effect of two kinds of alkali solutions (NaOH and TMAH, tetramethyl ammonium hydroxide) on
the crystalline structureof irradiated cotton-cellulosewas compared. The transformationof celluloseI
to cellulose II was observed applying DRIFT technique by the increase of the absorbance at 896 cm
and XRD. The results obtained by the two methods were in good correlation. An increase in carbonyl
content (as detected by FTIR by measuring the absorbance at 1740 cm
) was found in the samples
due to oxidative degradation.
The primary structure of cellulose allows extensive interactions between its chains
resulting inahighly crystalline supramolecular structure(the crystallinity is60 –70%).
In order to make available additional surfaces or to alter crystal structure, cellulose
is usually treated by various physical or chemical methods. This process is called
activation . A simple method for cellulose activation is exposure to high-energy
irradiation, such as gamma or electron rays . During irradiation, intermediates
(free radicals and radical ions) are produced, probably by the splitting of the
glycosidic bond (see Fig. 1) [3–5]. These intermediates in the presence of vinyl
monomers can initiate reactions to yield grafted cellulosic bers [6–8] with desired
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