Swelling of biodegradable polymers for the production of nanocapsules and films with the incorporation of essential oils
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Swelling of biodegradable polymers for the production of nanocapsules and films with the incorporation of essential oils Daniela De Conto1,2 · Venina dos Santos2 · Ademir José Zattera2 · Ruth Marlene Campomanes Santana1 Received: 16 March 2020 / Revised: 8 September 2020 / Accepted: 6 November 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Many researchers work with essential oils for several applications, such as their impregnation in polymeric films and for obtaining micro-/nanocapsules by using polymers as shell material. Polymer swelling/liquid dissolution is an extremely important property for controlled release of essential oils. Therefore, this work proposes a comparative study of swelling/dissolution interaction of polymer films immersed in different essential oils. Six polymers were used for this study: polycaprolactone (PCL) and poly(lactic acid) (PLA), gum arabic, sodium alginate, gelatin, and carboxymethyl cellulose. Polymer films were obtained by applying the casting method. In addition, PCL and PLA were molded by compression. Six different essential oils were used: Mentha piperita, Cymbopogon nardus, Mentha arvensis, Syzygium aromaticum, Lavandula hybrida, and Eucalyptus globulus. Each film was kept at room temperature immersed in sufficient quantity to cover the polymer film at intervals of 1, 3, 5, 7, 14, 28, 56, and 112 days. The same procedure was repeated at 4 °C and 35 °C at intervals of 1, 3, 5, and 7 days. PCL and PLA films were completely dissolved in Syzygium aromaticum essential oils for 24 h at the three temperatures tested. For all other polymers, weight gain occurred during the first 7 days and remained constant during the following days. The highest weight gains were 15.519% and 10.463% for polycaprolactone with Mentha piperita and gum arabic with Eucalyptus globulus, respectively. Keywords Essential oils · Polymers · Swelling · Encapsulation · Films * Daniela De Conto [email protected] 1
Program of Postgraduate Studies in Mining, Metals and Materials Engineering (PPGE3M), Federal University of Rio Grande do Sul (UFRGS), Bento Gonçalves Avenue, 9500, Porto Alegre, Rio Grande do Sul 91501‑970, Brazil
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Postgraduate Program in Process and Technology Engineering (PGEPROTEC), University of Caxias do Sul (UCS), Francisco Getulio Vargas St., 1130, Caxias do Sul, Rio Grande do Sul 95070‑560, Brazil
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Vol.:(0123456789)
Polymer Bulletin
Introduction The incorporation of new additives in polymeric materials provides specific properties. Essential oils (EO) are incorporated into biopolymer films to evaluate their antimicrobial efficiency and antibacterial activity among other properties. Studies of Souza et al. [1] developed bionanocomposites based on chitosan/montmorillonite incorporated with two different EO, rosemary (Rosmarinus officinalis L.) and ginger (Zingiber officinale Rosc), and to evaluate their antimicrobial and antioxidant properties via in vitro assays. Do Evangelho et al. [2] evaluated the morphological, optical, mechanical, a
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