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Rheological behaviour of clay incorporated natural rubber and chlorobutyl rubber nanocomposites

机译：掺有天然橡胶和氯丁基橡胶纳米复合材料的流变行为

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The rheological behaviour of organoclay nanocomposites based on natural rubber (NR) and chlorine substituted isobutyl-isoprene rubber (CIIR), was investigated separately. For the study, an organoclay Nanomer I.44P treated with a surfactant containing hydrogenated tallow, quaternary ammonium chloride, was used. The linear dynamic viscoelastic measurements indicated that the viscosity of NR/organoclay nanocomposites increased as the nanofiller content increases from 0 to 10 phr. NR nanocomposites showed the network formation, however, real solid like behaviour was not observed as reported in the case of other polymer/clay nanocomposites. The extent of exfoliation of nanofillers in NR nanocomposites was estimated using their shear thinning behaviour. Form factor calculations based on TEM data indicated excellent dispersion of clay in the NR matrix. The modeling of the linear dynamic viscoelasticity in NR nanocomposites has been done using the Carreau-Yasuda model (CY model). Interestingly, the behaviour of CIIR nanocomposites was very different from NR nanocomposites. CIIR/organoclay nanocomposites did not show any variation in the viscosity as the filler loading varies from 0 to 10 phr. Viscosity and modulus plots as a function of frequency with varying clay content coalesced into a master curve indicating lack of interaction between clay and CIIR matrix. This has been explained based on polarity mismatch, steric effects and high viscosity of CIIR as compared to NR. The WAXD and TEM analyses showed an intercalated and agglomerated morphology for CIIR/clay nanocomposites. The behaviour of CIIR nanocomposites in this study has been explained by suggesting a different mechanism, where nanofillers are encapsulated in certain "pockets". The mechanism proposed on CIIR nanocomposites is supported with the help of transmission electron microscopy (TEM).
机译：分别研究了基于天然橡胶（NR）和氯取代异丁基异戊二烯橡胶（CIIR）的有机粘土纳米复合材料的流变行为。为了进行研究，使用了用含有氢化牛脂氯化季铵的表面活性剂处理过的有机粘土纳米单体I.44P。线性动态粘弹性测量表明，NR /有机粘土纳米复合材料的粘度随着纳米填料含量从0到10 phr的增加而增加。 NR纳米复合材料显示出网络形成，但是，未观察到像其他聚合物/粘土纳米复合材料那样的真实固体状行为。 NR纳米复合材料中纳米填料的剥落程度可通过其剪切稀化行为进行估算。基于TEM数据的形状因子计算表明，粘土在NR基体中的分散性极好。使用Carreau-Yasuda模型（CY模型）对NR纳米复合材料的线性动态粘弹性进行了建模。有趣的是，CIIR纳米复合材料的行为与NR纳米复合材料非常不同。 CIIR /有机粘土纳米复合材料的填充量从0到10 phr不等，粘度没有变化。粘度和模量图随频率变化，随粘土含量的变化聚结成主曲线，表明粘土与CIIR基质之间缺乏相互作用。这是基于极性不匹配，空间效应和CIIR与NR相比的高粘度进行解释的。 WAXD和TEM分析显示了CIIR /粘土纳米复合材料的插层和团聚形态。 CIIR纳米复合材料在这项研究中的行为已经通过提出了一种不同的机理进行了解释，其中纳米填料被封装在某些“口袋”中。借助透射电子显微镜（TEM）支持在CIIR纳米复合材料上提出的机理。

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