The aim of the study was to assess the effect of the addition of citric and malic acid and heat curing on the mechanical, physical and optical properties of poly(vinyl alcohol) (PVOH) films. The addition of the organic acids without successive thermal treatments has a mere plasticising effect, while their application with heat curing has a combined crosslinking and plasticising effect. While conventional plasticizers and crosslinkers improve either extensibility or tensile strength of films, respectively, the addition of citric and malic acid coupled with heat curing determined good tensile strength and extensibility. Hydrophilicity was significantly reduced by thermal curing and even further reduced with the organic acids addition. The high transparency of the PVOH films was not affected either by heat-curing, acid addition and their combination, while the use of high curing temperature coupled with acid addition caused a slight yellowing of the films. The use of citric and malic acid in combination with thermal curing is a viable strategy for tailoring the performances of PVOH films thus broadening their spectrum of application.

Properties of poly(vinyl alcohol) films as determined by thermal curing and addition of polyfunctional organic acids / Bellelli, Massimo; Licciardello, Fabio; Pulvirenti, Andrea; Fava, Patrizia. - In: FOOD PACKAGING AND SHELF LIFE. - ISSN 2214-2894. - 18:(2018), pp. 95-100. [10.1016/j.fpsl.2018.10.004]

Properties of poly(vinyl alcohol) films as determined by thermal curing and addition of polyfunctional organic acids

BELLELLI, MASSIMO;Licciardello Fabio
;
Pulvirenti Andrea;Fava Patrizia
2018

Abstract

The aim of the study was to assess the effect of the addition of citric and malic acid and heat curing on the mechanical, physical and optical properties of poly(vinyl alcohol) (PVOH) films. The addition of the organic acids without successive thermal treatments has a mere plasticising effect, while their application with heat curing has a combined crosslinking and plasticising effect. While conventional plasticizers and crosslinkers improve either extensibility or tensile strength of films, respectively, the addition of citric and malic acid coupled with heat curing determined good tensile strength and extensibility. Hydrophilicity was significantly reduced by thermal curing and even further reduced with the organic acids addition. The high transparency of the PVOH films was not affected either by heat-curing, acid addition and their combination, while the use of high curing temperature coupled with acid addition caused a slight yellowing of the films. The use of citric and malic acid in combination with thermal curing is a viable strategy for tailoring the performances of PVOH films thus broadening their spectrum of application.
dic-2018
18
95
100
Properties of poly(vinyl alcohol) films as determined by thermal curing and addition of polyfunctional organic acids / Bellelli, Massimo; Licciardello, Fabio; Pulvirenti, Andrea; Fava, Patrizia. - In: FOOD PACKAGING AND SHELF LIFE. - ISSN 2214-2894. - 18:(2018), pp. 95-100. [10.1016/j.fpsl.2018.10.004]
Bellelli, Massimo; Licciardello, Fabio; Pulvirenti, Andrea; Fava, Patrizia
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1166992
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