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Behavior of UV-cured print inks on LDPE and PBAT/TPS blend substrates during curing, postcuring, and accelerated degradation

Authors

  • Marcelo Augusto Gonçalves Bardi,

    1. Universidade de São Paulo (USP), Instituto de Pesquisas Energéticas e Nucleares (IPEN/Centro de Tecnologia das Radiações (CTR)), São Paulo, Brazil
    2. Michigan State University (MSU), School of Packaging, East Lansing, Michigan
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  • Mara de Mello Leite Munhoz,

    1. Universidade de São Paulo (USP), Instituto de Pesquisas Energéticas e Nucleares (IPEN/Centro de Tecnologia das Radiações (CTR)), São Paulo, Brazil
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  • Henrique Alves de Oliveira,

    1. Universidade de São Paulo (USP), Instituto de Pesquisas Energéticas e Nucleares (IPEN/Centro de Tecnologia das Radiações (CTR)), São Paulo, Brazil
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  • Rafael Auras,

    1. Michigan State University (MSU), School of Packaging, East Lansing, Michigan
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  • Luci Diva Brocardo Machado

    Corresponding author
    1. Universidade de São Paulo (USP), Instituto de Pesquisas Energéticas e Nucleares (IPEN/Centro de Tecnologia das Radiações (CTR)), São Paulo, Brazil
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ABSTRACT

During radiation curing, a reactive formulation is converted into a highly crosslinked coating film by means of polymerization reactions. This three-dimensional (3D) network is resistant to external degrading factors as it cannot be undone by any physical–chemical means. In this study, various ultraviolet (UV)-curable ink formulations with different pigments were developed. The behavior of the UV-curable inks was evaluated during UV curing in a photocalorimeter or in a UV tunnel. Inks were exposed to accelerated aging in an accelerated weathering chamber and their physical–chemical properties were investigated. The presence of residual fractions of unreacted species trapped in the 3D network formed during UV curing interferes with the degradation of the main structure during exposure in the weathering chamber. The ink formulations that did not easily absorb UV light increased in gloss and hardness, indicating that residual crosslinking is taking place at the same time that degradation is occurring. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41116.

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