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Materials 2017, 10(8), 850; doi:10.3390/ma10080850

Performance of Poly(lactic acid) Surface Modified Films for Food Packaging Application

1
Department of Chemical Science, University of Catania, Viale A. Doria 6, 95125 Catania (CT), Italy
2
Interdepartmental Centre for Agri-Food Industrial Research, Alma Mater Studiorum, University of Bologna, Piazza Goidanich 60, 47521 Cesena (FC), Italy
3
Semenov Institute of Chemical Physics, Kosygin str. 4, 119991 Moscow, Russia
*
Author to whom correspondence should be addressed.
Received: 30 June 2017 / Revised: 17 July 2017 / Accepted: 18 July 2017 / Published: 25 July 2017
(This article belongs to the Special Issue Biobased Polymers for Packaging Applications)
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Abstract

Five Poly(lactic acid) (PLA) film samples were analyzed to study the gas barrier behavior, thermal stability and mechanical performance for food packaging application. O2, CO2, N2, N2O, and C2H4 pure gases; Air; and Modified Atmosphere (MA, 79% N2O/21% O2) were used to analyze the influence of the chemical structure, storage temperature and crystalline phase on the gas barrier behavior. The kinetic of the permeation process was investigated at different temperatures, ranging from 5 °C to 40 °C. Annealing thermal treatment on the samples led to the crystalline percentage, influencing especially the gas solubility process. Thermal properties such as Tg and χc, and mechanical properties such as tensile strength and modulus were remarkably improved with surface PLA modification. A more pronounced reinforcing effect was noted in the case of metallization, as well as improved gas barrier performance. Tensile testing and tensile cycling tests confirmed the rigidity of the films, with about a 20% loss of elasticity after 25 cycles loading. View Full-Text
Keywords: biodegradable food packaging; structure-property relations; mechanical properties; gas barrier behavior; poly(lactic acid) biodegradable food packaging; structure-property relations; mechanical properties; gas barrier behavior; poly(lactic acid)
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Siracusa, V.; Dalla Rosa, M.; Iordanskii, A.L. Performance of Poly(lactic acid) Surface Modified Films for Food Packaging Application. Materials 2017, 10, 850.

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