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首页> 外文期刊>Journal of Applied Polymer Science >Improved Mechanical Properties of NR/EPDM Blends by Controlling the Migration of Curative and Filler via Reactive Processing Technique
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Improved Mechanical Properties of NR/EPDM Blends by Controlling the Migration of Curative and Filler via Reactive Processing Technique

机译：通过反应性加工技术控制固化剂和填充剂的迁移，从而改善NR / EPDM共混物的机械性能

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Simple blending of natural rubber/ethylene-propylene-diene rubber (NR/EPDM) generally results ill interior mechanical properties because Of curative migration and their differences for filler affinity. Ill this Work, the 70/30 and 50/50 NR/EPDM blends prepared by reactive processing techniques were investigated and compared with file simple, nonreactive blends. The reactive blend compounds, were prepared by preheating EPDM, containing all curatives to a predetermined time related to their scorch time prior to blending with NR. For the 70/30 gum blends, four types of accelerators were studied: 2,2-mercaptobenzothiazole (MBT), 2,2-dithiobis(benzothiazole) (MBTS), N-cyclohexyl-2-benzothiazolesulfenamide (CBS), and N-tert-buty-2-benzothiazolesulfenamide (TBBS). When compared with the simple blends, the reactive blends cured with CBS and MBTS showed a clearly improved tensile strength whereas the increase of tensile strength in the blends cured with TBBS and MBT was marginal. However, a dramatic improvement Of Ultimate tensile properties in the reactive 50/50 NR/EPDM blends cured with TBBS was observed when compared with the simple blend. For the N-550-filled blends at the blend ratios of 70/30 and 50/50, the reactive-filled blends prepared Under file optimized preheating times demonstrated Superior tensile strength and elongation at break over the simple. blends. The improved crosslink and/or filler distribution between file two rubber phases in the reactive blends accounts for such improvement in their mechanical properties. This is shown in file scanning electron micrographs of the tensile fractured surfaces of the reactive blends, which indicate a more homogeneous blend. (c) 2008 Wiley Periodicals, Inc. J Appl Polym Sci 111: 2035-2043, 2009
机译：天然橡胶/乙烯-丙烯-二烯橡胶（NR / EPDM）的简单共混通常会导致不良的内部机械性能，这是由于固化剂迁移及其对填料亲和力的差异所致。在这项工作中，对通过反应性加工技术制备的70/30和50/50 NR / EPDM共混物进行了研究，并将其与简单的非反应性共混物进行了比较。通过预热包含所有固化剂的EPDM到与NR混合之前的焦化时间有关的预定时间来制备反应性共混化合物。对于70/30的口香糖混合物，研究了四种类型的促进剂：2,2-巯基苯并噻唑（MBT），2,2-二硫代双（苯并噻唑）（MBTS），N-环己基-2-苯并噻唑亚磺酰胺（CBS）和N-叔丁基-2-苯并噻唑亚磺酰胺（TBBS）。与简单的共混物相比，用CBS和MBTS固化的反应性共混物显示出明显改善的拉伸强度，而用TBBS和MBT固化的共混物的抗张强度增加很小。但是，与简单共混物相比，在用TBBS固化的50/50 NR / EPDM反应性共混物中，极限拉伸性能得到了显着改善。对于比例为70/30和50/50的N-550填充共混物，根据文件优化的预热时间制备的反应性填充共混物表现出优异的拉伸强度和断裂伸长率。混合。在反应性共混物中的两个橡胶相之间的改进的交联和/或填料分布说明了其机械性能的这种改进。这在反应性共混物的拉伸断裂表面的文件扫描电子显微照片中显示，其表明更均匀的共混物。 （c）2008 Wiley Periodicals，Inc. J Appl Polym Sci 111：2035-2043，2009

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