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The effect of Gamma irradiation on interaction of nanocellulose with water studied by differential scanning calorimetry and mm-wave spectroscopy Host Publication: International conference on Development and Applications of Nuclear Technologies Authors: G. Pandey, K. Ciesla1, J. Stiens and H. Rahier Publication Date: Sep. 2017
Abstract: The studies are connected to practical application of biopolymers, modification of biopolymers and the products manufactured basing biopolymers by applying ionising radiation, and to the radiation sterilization of such products. The interest increases in use of biopolymers for packaging purposes [1Dž]. This concerns also packaging of the products predicted for radiation decontamination. Addition of nanocelluloses into polymer and biopolymer materials appears one ability to improve properties of such materials related to packaging application [3]. Recently, the trials are also conducted to modify by radiation techniques the structure and properties of nanoparticles, including nanocellulosesInteraction of nanocelluloses with water constitute an important issue in relation to dressings or to personal care products based on nanocelluloses, and in relation to packaging materials. We have previously proven that differential scanning calorimetry (DSC) constitutes the appropriate method for studying interaction of biopolymers with liquids. The method enables to distinguish various states of water in cellulosic material [4], as well as to evaluate the crystalline properties of biopolymer systems plasticized by water [5Lj]. Similarly, millimeter wave (mm waves) spectroscopy enables to evaluate interaction of water with various materials, including biopolymers and food.Our present study concerned the influence of gamma irradiation on the interaction of nanocrystalline cellulose (NCN) with water, carried out by differential scanning calorimetry (DSC) and millimeter wave spectroscopy. Powder NCN and gel solutions of NCN were irradiated with gamma rays applying doses of 5 and 25 kGy. The differences were discovered between the non-irradiated samples and these irradiated by means of both methods. A decrease in the content of non-freezable strongly bound water was discovered after irradiation with a dose of 25 kGy. However, the differences were found between the directions of the changes caused by irradiation with a dose of 5 kGy and by irradiation with a dose of 25 kGy. In particular, the increase in participation of the interstitial water or of bulk water content in the fraction of the freezable water can be deduced, depending on the applied irradiation dose. The results can be related to the differences in participation of the degraded and crosslinked products in the materials subjected to irradiation applying both doses.
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