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317 results on '"Di Maio, Luciano"'

181. Effect of Nanocomposite Composition on Shear and Elongational Rheological Behavior of PLA/MMT Hybrids.

Author

Garofalo, Emilia, Scarfato, Paola, Di Maio, Luciano, and Incarnato, Loredana

Subjects
POLYLACTIC acid, SHEAR (Mechanics), RHEOLOGY, TUNING (Machinery), SILICATES, POLYMERIC nanocomposites
Abstract

The present work focuses on the possibility of conveniently tuning materials in PLA based nanocomposites in order to improve their processability in manufacturing processes where extensional flow is mainly involved. Nanocomposites at a constant silicate loading were produced by melt compounding, using a commercial polylactide grade (PLA 4032D) and two different organo-silicates (Cloisite 30B and Nanofil SE3010). A morphological characterization in solid and molten state, realized by TEM investigations and shear rheological measurements, firstly pointed out the influence of composition on the nanostructure of the hybrid systems. All the samples were then submitted to uniaxial stretching and the rheological response of the different nanocomposites was correlated to the initial nanostructure and the different polymer-clay affinity. [ABSTRACT FROM AUTHOR]

Published
2014
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197. Development and oxygen scavenging performance of three-layer active PET films for food packaging.

Author

Di Maio, Luciano, Scarfato, Paola, Galdi, Maria Rosaria, and Incarnato, Loredana

Subjects
POLYETHYLENE terephthalate, FOOD packaging, FOOD quality, REACTIVE oxygen species, POLYESTERS
Abstract

ABSTRACT Polymeric active materials represent an innovative food packaging concept that has been introduced to improve the quality of foods and to enhance their shelf life. In this article, the effect of the inclusion of an oxygen scavenger in a polymeric matrix, realizing multilayer active polyester films by coextrusion process, is analyzed. In particular, three layer active films, at different mass ratios of the layers, were produced to form symmetrical "ABA" structures comprising polyethylene terephthalate (PET) with a polymeric oxygen scavenger (OS) as core layer and pure PET as external layers. Oxygen scavenging tests conducted on the multilayer active structures have pointed out the role of the relative layer thickness in controlling the scavenging capacity, the activity time and the oxygen absorption rate. A modeling of the scavenging phenomena, which combines a quasi steady-state distribution in the skin layers with a flat profile of O2 content in the active core layer, can explain the experimentally observed oxygen absorption rate at short times. Moreover, steady state oxygen transport measurements, performed when the scavenger reactive capacity is exhausted, have shown that the presence of the active phase slightly reduces the O2 permeability, compared with the neat PET. The effect, which progressively increases with the amount of active phase in the film formulation, was related to the different morphological state developed on processing. Finally, preliminary shelf life tests on fresh-cut untreated apples suggest that the developed three layer active films have a significant potential in the shelf-life extension of oxygen sensitive food products. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41465. [ABSTRACT FROM AUTHOR]

Published
2015
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