Using an organically-modified montmorillonite to compatibilize a biodegradable blend |
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| Affiliation: | 1. Dipartimento di Ingegneria Civile, Chimica e Ambientale (DICCA), Università degli Studi di Genova, Via Opera Pia 15, 16145 Genova, Italy;2. Instituto de Tecnología de los Materiales (ITM), Universidad Politècnica de València (UPV), Camino de Vera S/N, 46022 Valencia, Spain;3. Departament d’Enginyeria Química, Escola Tècnica Superior d’Enginyeria, Universitat de València, Av. de la Universitat, s/n, 46100, Burjassot, Spain;4. School of Chemical Science and Engineering, Fibre and Polymer Technology, KTH – Royal Institute of Technology, Teknikrigen 56-58, SE-10044 Stockholm, Sweden;5. Department of Materials Science and Technology, Faculty of Science, Prince of Songkla University, Songkhla, 90112, Thailand;1. Institute of Physical Chemistry “Ilie Murgulescu”, Romanian Academy, Spl. Independentei 202, 060021 Bucharest, Romania;2. National Institute of Material Physics, 105 bis Atomistilor Street, 077125 Bucharest–Magurele, Romania;3. Honeywell Romania SRL, Calea Floreasca Nr. 169A, 014459 Bucharest, Romania;1. Institute for Frontier Materials, Deakin University, Burwood, VIC, Australia;2. Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, Copenhagen, Denmark;3. European Spallation Source, Lund, Sweden |
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| Abstract: | Glycerol-plasticized cornstarch and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) blends were prepared by melt-extrusion at a constant 70:30 (mass/mass) ratio in the presence of a commercial organoclay. The effect of increasing the organoclay content on the morphology and physical properties of the blends was investigated soon after processing and after aging for 12 months. After processing, the materials were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and dynamic mechanical analysis (DMA). The results indicated that increasing clay mineral contents promoted significant improvements in the compatibility between the components. After aging, the samples were characterized by SEM, XRD and small-angle X-ray scattering (SAXS). Unexpectedly, the reduced size of the PHBV dispersed phase and the decreased crystallinity of both phases in the hybrids were maintained. XRD and SAXS results unambiguously proved the presence of both exfoliated layers and a small volume fraction of organoclay aggregates in the aged clay polymer nanocomposites. |
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