Abstract
The dried blends containing sodium and ammonium salts of lignite humic acids (humates, 0.5–10% w/w) in polyvinyl alcohol (PVA) were exposed to high dosage of γ-irradiation in the range of doses 127–806 kGy. Resulted products were then tested for their stability using thermogravimetrical analysis. As a reference the non-treated blends were used since the pure PVA exposed to γ-irradiation very quickly lost its stability and resulting consistence did not allow the stability tests. Stabilities showed a strong concentration and counterion dependency. While sodium counterion caused mostly destabilization with increasing dose, the ammonium counterion acted in an opposite way. The tests carried out in a moisturizing container revealed the changes in water absorbing capacity of irradiated samples and allowed partial explanation of humate stabilizing effect. Generally, at lower concentration of a humate the increase was observed with an increase in the γ-irradiation dose and vice versa. The results confirmed the antioxidant and stabilizing effect of humic acids added to some synthetic polymers and their applicability in materials exposed to γ-irradiation.
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Acknowledgments
This work was financially supported by the Ministry of Education of the Czech Republic, project MSM 0021630501. Further, the authors thank to prof. Peter Šimon, Faculty of Chemical and Food Technology, Slovak University of Technology for his comments on some results.
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Bakajová, B., Ilčin, M., Holá, O. et al. Resistance of polyvinyl alcohol blends stabilized by sodium and ammonium salts of lignite humic acids against γ-irradiation. J Radioanal Nucl Chem 287, 449–458 (2011). https://doi.org/10.1007/s10967-010-0700-8
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DOI: https://doi.org/10.1007/s10967-010-0700-8