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Swelling behavior of gelatin-ionic liquid functional polymers

Authors

  • Rui Nuno Leitão de Carvalho,

    1. Institute for Biotechnology and Bioengineering (IBB), Centre for Biological and Chemical Engineering, Instituto Superior Técnico, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal
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  • Nuno Miguel Torres Lourenço,

    Corresponding author
    1. Institute for Biotechnology and Bioengineering (IBB), Centre for Biological and Chemical Engineering, Instituto Superior Técnico, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal
    • Institute for Biotechnology and Bioengineering (IBB), Centre for Biological and Chemical Engineering, Instituto Superior Técnico, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal
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  • Pedro Miguel Vidinha Gomes,

    1. Departamento de Química, REQUIMTE/CQFB, FCT, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
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  • Luís Joaquim Pina da Fonseca

    1. Institute for Biotechnology and Bioengineering (IBB), Centre for Biological and Chemical Engineering, Instituto Superior Técnico, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal
    2. Department of Bioengineering, Instituto Superior Técnico, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal
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Abstract

In this work, hydrogels obtained by mixing gelatin with ionic liquids (ILs) are prepared. Two different ILs, [emim][EtSO4] and [bmim][N(CN)2], are used to prepare hydrogels with different amounts of starting water and phosphate buffer content, which are used after a maturation period. The percentage of swelling in water and phosphate buffer, swelling and diffusion parameters are investigated in thin-film polymers (1 × 1 cm2; 1-mm thick) with different maturation times and at temperatures ranging from 4 to 37 °C. [emim][EtSO4] polymers show a moderate (100% weight increase) but quick swelling that reaches 80% of the equilibrium within 30 min. They are liquefied and dissolved at temperatures above 25 °C. [bmim][N(CN)2] polymers with short maturation times exhibit a similar behavior to the former, but more mature hydrogels register a very small swelling, abnormal kinetics and are more resistant to higher temperatures. © 2013 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys., 2013

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