Influence of Nonmodified Layered Double Hydroxide (LDH) Metal Constituents in PMMA/LDH Nanocomposites
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Influence of Nonmodified Layered Double Hydroxide (LDH) Metal Constituents in PMMA/LDH Nanocomposites Amanda Damasceno Leão1 · Lindomar Avelino da Silva2 · Fábio de Oliveira Silva Ribeiro3 · Durcilene Alves da Silva3 · Elvis Joacir de França2 · Kátia Aparecida da Silva Aquino2 · José Lamartine Soares‑Sobrinho1 Received: 7 July 2020 / Accepted: 2 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Layered double hydroxides (LDH) have been extensively studied for a broad range of applications because their ease synthesis and chemical/crystal structure provides opportunities of combination with polymers forming nanocomposites. In this way, we have attempted to develop polymethylmethacrylate/LDH (PMMA/LDH) nanocomposites by using nonmodified Mg–Al LDH and Zn-Al LDH following in situ polymerization reaction. The effect of the varying loadings of LDH in the PMMA structure, morphology, and thermal properties of the synthesized PMMA/LDH nanocomposites has been investigated. The data showed nanocomposites formation with exfoliation /intercalation of LDH in PMMA matrix. Besides, not all the loadings of LDH in nanocomposites have improved thermal stability. This result does mean that loading of LDH plays an important role in the properties of PMMA/LDH nanocomposite. Keywords Nanocomposites · Thermal stability · Poly(methyl methacrylate) · LDH
1 Introduction Composites have attracted the attention of researchers and industry because the addition of inorganic particles to polymers can improve the properties of these materials [1, 2]. In 1989, the automotive industry started to use composites containing cation exchange clays to obtain materials with better mechanical properties [3, 4], flame retardancy [5, 6], gas barrier properties [7], and corrosion protection [8, 9]. Subsequently, applications in packaging materials for food, beverages, and pharmaceutical materials were developed. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10904-020-01742-z) contains supplementary material, which is available to authorized users. * Kátia Aparecida da Silva Aquino [email protected] 1
Department of Pharmaceutical Sciences, Federal University of Pernambuco-UFPE, University city, s/n, Recife, Brazil
2
Post‑Graduate Program in Energy and Nuclear Technologies‑PROTEN‑UFPE/CRCN, Federal University of Pernambuco-UFPE, University City, s/n, Recife, Brazil
3
Federal University of Piauí-UFPI, Biodiversity and Biotechnology Research Center - BIOTEC , University City, s/n, Parnaíba, Brazil
In the medicinal field, these composites have been applied for the development of new drug release systems, modifying their dissolution rates, release kinetics, thermal stability and the technological properties of the systems in which they are incorporated [10–16]. Among the inorganic compounds, Layered Double Hydroxides (LDH) materials are an interesting class, consisting of a two-dimensional sheet-like structure with strong bindings within the individual l
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