Synergistic effect of dipentaerythritol and montmorillonite in EVOH‐based nanocomposites
作者： Micaela Vannini , Paola Marchese , Annamaria Celli , Carla Marega , Antonio Marigo
DOI: 10.1002/APP.42265
关键词: Intercalation (chemistry) 、 Plasticizer 、 Penetration (firestop) 、 Montmorillonite 、 Crystallization 、 Polymer 、 Small-angle X-ray scattering 、 Composite material 、 Materials science 、 Nanocomposite
摘要: To solve problems of stiffness EVOH in film preparation, new formulations are investigated. First, dipentaerythritol (DPE) is blended with EVOH: it acts as plasticizer, decreases the crystallization temperature and allows preparation articles featuring enhanced flexibility stretchability. However, beyond a certain loading (above 10 wt %) DPE can crystallize segregate during cooling, causing further processability due to material embrittlement. Then, small amount montmorillonite (MMT) mixed EVOH/DPE system: results that for specific compositions MMT inhibits crystallization. At same time, DPE, thanks its high polarity affinity both clay polymeric matrix, improves intercalation nanoclays, promoting penetration polymer chains within layers clay. The synergistic effects matrix confirmed by DSC, WAXD, SAXS TEM analyses. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42265.
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