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首页> 外文期刊>Journal of Applied Polymer Science >Effect of Ca2+ induced crosslinking on the mechanical and barrier properties of cast alginate films
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Effect of Ca2+ induced crosslinking on the mechanical and barrier properties of cast alginate films

机译：Ca2 +诱导交联对铸藻膜膜机械和阻隔性能的影响

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The use of alginate as a coating material for packaging applications is currently limited due to its difficult processability and high moisture sensitivity. Therefore, this study addresses the crosslinking and scale-up to a continuous application. Three different crosslinking agents were applied: CaCl2 with ethylene diamine tetraacetic acid and two low soluble salts (CaHPO4 and CaCO3). Those were incorporated by internal setting in an alginate matrix with varying Ca2+ concentration (c(Ca)) and ratio. With the addition of Ca2+, the tensile strength and elongation at break of the cast alginate films increased. This was optimal for a c(Ca) of 0.010-0.015 g (g alginate)(-1) dependent on the crosslinking agent. The decrease in water vapor and oxygen permeability due to crosslinking was independent of the crosslinking agent. However, the optimal c(Ca) aiming to decrease permeability was different for the crosslinking agents: CaHPO4 showed best results at a c(Ca) of 0.010 g (g alginate)(-1), CaCl2 at 0.012 g (g alginate)(-1), and CaCO3 at 0.027 g (g alginate)(-1). Upon all analyzed properties CaHPO4 was the most promising crosslinking agent for alginate. Moreover, selected alginate formulations were successfully processed in a continuous lacquering plant. The produced two-layer systems have very low oxygen permeabilities which can be further reduced by crosslinking. (C) 2017 Wiley Periodicals, Inc.
机译：由于其困难的可加工性和高湿度敏感性，使用藻酸盐作为用于包装应用的涂料作为涂料。因此，本研究解决了交联和扩展到连续应用。施用三种不同的交联剂：CaCl 2配乙烯二胺四乙酸和两个低可溶性盐（CaHPO4和CaCO 3）。通过内部设置在藻酸盐基质中以不同的Ca2 +浓度（C（Ca））和比例来纳入其中。随着Ca2 +的加入，铸藻酸盐膜断裂的拉伸强度和伸长率增加。这对于依赖于交联剂的0.010-0.015g（g藻酸盐）（ - 1）的C（Ca）是最佳的。由于交联引起的水蒸气和氧气渗透性的降低与交联剂无关。然而，旨在降低渗透性的最佳C（CA）对于交联剂，CaHPO 4显示出0.010g（G藻酸盐）（ - 1），CaCl 2的AC（Ca）的最佳结果，为0.012g（G藻酸盐）（ - 1），CaCO 3为0.027g（G藻酸盐）（ - 1）。在所有分析的性质上，CaHPO4是藻酸盐最有前途的交联剂。此外，在连续涂漆厂中成功地加工了选定的藻酸盐制剂。所产生的双层系统具有非常低的氧气渗透，可以通过交联进一步降低。 （c）2017 Wiley期刊，Inc。

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