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1.
Cellulose-glycerol-polyvinyl alcohol composite films for food packaging: Evaluation of water adsorption, mechanical properties, light-barrier properties and transparency
Patricia Cazón, Manuel Vazquez, Gonzalo Velazquez, 2018, original scientific article

Abstract: Nowadays consumers are aware of environmental problems. As an alternative to petrochemical polymers for food packaging, researchers have been focused on biopolymeric materials as raw material. The aim of this study was to evaluate mechanical properties (toughness, burst strength and distance to burst), water adsorption, light- barrier properties and transparency of composite films based on cellulose, glycerol and polyvinyl alcohol. Scanning electron microscopy, spectral analysis (FT-IR and UV–VIS-NIR) and differential scanning calorimetry were performed to explain the morphology, structural and thermal properties of the films. Results showed that polyvinyl alcohol enhances the toughness of films up to 44.30 MJ/m3. However, toughness decreases when glycerol concentration is increased (from 23.41 to 10.55 MJ/m3). Water adsorption increased with increasing polyvinyl alcohol concentration up to 222%. Polyvinyl alcohol increased the film thickness. The films showed higher burst strength (up to 12014 g) than other biodegradable films. The films obtained have optimal values of transparency like those values of synthetic polymers. Glycerol produced a UV protective effect in the films, an important effect for food packaging to prevent lipid oxidative deterioration. Results showed that it is feasible to obtain cellulose-glycerol-polyvinyl alcohol composite films with improved properties.
Keywords: Cellulose, Toughness, Burst strength, Distance to burst, Water adsorption, Transparency
Published in RUNG: 14.12.2020; Views: 2803; Downloads: 0
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Regular and honorary membership: on two kinds of deverbal nouns in Serbo-Croatian
Marko Simonović, Boban Arsenijević, 2014, original scientific article

Abstract: Serbo-Croatian deverbal nouns in -VV.je show a striking dichotomy along three apparently unrelated dimensions - productivity, semantic transparency and prosodic faithfulness to the base. Nominalisations from imperfective verbs display full productivity, semantic transparency, and a prosodic pattern attested in the paradigm of the verb. Those from perfective verbs are derived only from a subset of S-C perfective verbs, semantically non-transparent, and display a prosodic pattern unattested in the paradigm of the verb. We argue that this match across different dimensions has a role in delimiting the domain of the paradigm of the verbal lexeme, and, consequently, in delimiting the verbal domain. We show that a prosodic pattern different from all the patterns attested in the verb's paradigm marks that the morphological complex containing the stem of the verb is a new separate lexeme. Our analysis has consequences for the theory of paradigms. We employ Lexical Conservatism (Steriade 1997) to model different levels of relatedness in the lexicon, making clear predictions on how forms converge and diverge overtime. Our model derives a coconut-like architecture of the lexicon, whose soft core contains paradigmatic derivations, and the outer layers involve the domains of increasingly constrained productivity, idiosyncratic semantics and new prosodic shapes.
Keywords: Deverbal Nominalisations, Lexical Conservatism, Paradigm, Productivity, Prosodic Faithfulness, Semantic Transparency. Link do revije: https://www.rivisteweb.it/doi/10.1418/78407#
Published in RUNG: 07.02.2018; Views: 4045; Downloads: 0
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