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A detailed dielectric characterization of the relaxation modes found in a poly(L-lactic acid), PLLA, film containing 0.4 mass% of water is provided. The sub-glass relaxation process is a superposition of two processes, one highly influenced by water with activation energy of 50 kJ mol–1, and another one, with longer relaxation times and lower intensity having activation energy of 38 kJ mol–1. Dried PLLA exhibits an abnormally broad secondary β-relaxation that probably corresponds to the superposition of multiple processes. Upon water sorption the strength of the more mobile process significantly increases being shifted to lower temperatures which allows the detection of the underlying process. The glass transition relaxation process is deviated to higher frequencies almost one decade due to the water plasticizing effect. The reported results show that small quantities of water may have a profound impact in the relaxational features in PLLA, which should be taken in account when considering the properties and performance of this system.

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Orvosi Hetilap
Authors: Gábor Somlyai, Miklós Molnár, Gábor Laskay, Mariann Szabó, Tamás Berkényi, Imre Guller, and András Kovács

Turusov, V. S., Siniak, I. E., Grigor’ev, A. I. és mtsai: Low-deuterium water effect on transplantable tumors. Vopr. Onkol., 2005, 51 , 99–102. Grigor’ev A. I. Low-deuterium water

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245 250 Irshad, M., Honna, T., Yamamoto, S. 2003: Saline water effect on nitrogen nutrition in maize ( Zea mays L.). Submitted to J. Plant Nutrition

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.11.011 . 13. Artiaga , R , Naya , S , Garcia , A , Barbadillo , F , Garcia , L 2005 Subtracting the water effect from DSC curves by using simultaneous TGA data . Thermochim Acta 428 : 137 – 139 10.1016/j.tca.2004

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Acta Archaeologica Academiae Scientiarum Hungaricae
Authors: Beáta Tugya, Katalin Náfrádi, Sándor Gulyás, Tünde Törőcsik, Balázs Pál Sümegi, Péter Pomázi, and Pál Sümegi

alkaline meadow soils ( Fig. 8 ) which have a significant water effect. Fig. 8. Pedological map of Lajos Kreybig (1937) about the study site (indicated as Felső and Alsó Varsány-puszta in the map). brown color = chernozem soil, blue color = hydromorphic

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