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首页> 外文期刊>Polymers for advanced technologies >PP/EPDM-based thermoplastic dynamic vulcanizates with organoclay: morphology, mechanical and viscoelastic properties
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PP/EPDM-based thermoplastic dynamic vulcanizates with organoclay: morphology, mechanical and viscoelastic properties

机译：具有有机粘土的基于PP / EPDM的热塑性动态硫化胶：形态，机械和粘弹性质

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摘要

Dynamically vulcanized nanocomposite thermoplastic vulcanizates (NC-TPVs) based on ethylenepropylene-diene rubber (EPDM) and melt intercalated hybrid of poly(propylene) (PP)/maleic anhydride grafted poly(propylene) (PP-g-MA) with organo-modified montmorillonite (org-MMT) were prepared. X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM) examination have been performed to evaluate the extent of the intercalation, as well as to characterize the microstructure developed during dynamic vulcanization. The organocaly was better intercalated and dispersed in the PP matrix of the NC-TPV samples at low clay contents. The NC-TPV samples showed a matrix-disperse type of morphology in which the crosslinked EPDM particles appeared in the form of agglomerates covered by a layer of nanocomposite PP (NC-PP). The NC-TPV samples exhibited higher elastic modulus compared with similar but unfilled TPV sample in spite of the lower crystallization degree for the former. The storage modulus (G') of the molten NC-TPV proved to be highly frequency dependent. This was assigned to the formation of a nanoclay network structure by the NC-PP covered EPDM rubber particles.
机译：基于乙丙二烯橡胶（EPDM）的动态硫化的纳米复合热塑性硫化橡胶（NC-TPV）和有机改性的聚丙烯（PP）/马来酸酐接枝的聚丙烯（PP-g-MA）的熔融插层杂化制备了蒙脱石（org-MMT）。 X射线衍射（XRD）分析和扫描电子显微镜（SEM）检查已经进行，以评估插层的程度，以及表征动态硫化过程中形成的微观结构。有机粘土在低粘土含量下更好地嵌入和分散在NC-TPV样品的PP基体中。 NC-TPV样品显示出基质分散型的形态，其中交联的EPDM颗粒以团聚体的形式出现，并被一层纳米复合PP（NC-PP）覆盖。尽管前者的结晶度较低，但NC-TPV样品与相似但未填充的TPV样品相比仍显示出较高的弹性模量。熔融NC-TPV的储能模量（G'）被证明与频率密切相关。通过NC-PP覆盖的EPDM橡胶颗粒，这被指定为纳米粘土网络结构的形成。

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