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Effect of Organic Peroxides on the Morphology and Properties of EVA/Cloisite 15A Nanocomposites

机译:有机过氧化物对EVA / Cloisite 15A纳米复合材料的形态和性能的影响

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This article describes the effect of the presence of organic peroxides on the morphology and properties of ethylene vinyl acetate copolymer (EVA)/Cloisite 15A nanocomposites. The results show that the presence of dicumyl peroxide (DCP) or dibenzoyl peroxide (DBP) during the preparation of EVA/Cloisite 15A clay nanocomposites gives rise to intercalated, exfoliated, or mixed morphologies, which are not normally observed for samples prepared in the absence of organic peroxides. In the absence of clay, both DCP and DBP initiate de-acetylation and chain scission of EVA chains, but the influence of DBP is more pronounced. The presence of clay inhibits the initiation of EVA degradation by DCP free radicals, which can be observed in the higher tensile strength values for DCP treated samples, as well as in the de-acetylation step in the TGA curves. DBP has a more significant influence on the polymer degradation, and this gives rise to reduced thermal stability and mechanical properties. (c) 2008 Wiley Periodicals, Inc. J Appl Polym Sci 112: 218-22-5, 2009
机译:本文介绍了有机过氧化物的存在对乙烯乙酸乙烯酯共聚物(EVA)/ Cloisite 15A纳米复合材料的形态和性能的影响。结果表明,在制备EVA / Cloisite 15A粘土纳米复合材料的过程中,过氧化二枯基(DCP)或过氧化二苯甲酰(DBP)的存在会导致插层,剥离或混合形貌,而在没有样品的情况下通常不会观察到这种现象。有机过氧化物。在没有粘土的情况下,DCP和DBP均会引发EVA链的脱乙酰化和断链,但DBP的影响更为明显。粘土的存在抑制了DCP自由基引发的EVA降解,这可以在DCP处理的样品的较高拉伸强度值以及TGA曲线的脱乙酰步骤中观察到。 DBP对聚合物降解有更重要的影响,这导致降低的热稳定性和机械性能。 (c)2008 Wiley Periodicals,Inc. J Appl Polym Sci 112:218-22-5,2009年

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