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首页> 外文期刊>Iranian polymer journal >Dynamically vulcanized thermoplastic elastomer nanocomposites based on linear low-density polyethylene/styrene-butadiene rubber/ nanoclay/bitumen: morphology and rheological behavior
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Dynamically vulcanized thermoplastic elastomer nanocomposites based on linear low-density polyethylene/styrene-butadiene rubber/ nanoclay/bitumen: morphology and rheological behavior

机译：基于线性低密度聚乙烯/苯乙烯-丁二烯橡胶/纳米粘土/沥青的动态硫化热塑性弹性体纳米复合材料：形态和流变行为

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Dynamically crosslinked thermoplastic elastomer nanocomposites were synthesized as modifier for the bitumen binder-based asphalts. Linear low-density polyethylene (LLDPE) and styrene-butadiene rubber (SBR), with the ratio of 80/20, bitumen, and organically modified clay (OC) were all melt mixed in the presence of the sulfur curing system. The proposed mixing was carried out in an internal mixer at 160 degrees C with a rotor speed of 120 rpm. To enhance the molecular interactions between the polymer phases and the clay silicate layers, maleic anhydride-grafted LLDPE (PE-g-MA) with the maleiation degree of 50% was also incorporated into the mixture. Observation of the composite samples, using the scanning electron microscopy (SEM), revealed the matrix dispersed type of morphology for all dynamically vulcanized samples. X-ray diffraction (XRD) and transmission electron microscopy (TEM) examinations evidenced the exfoliation of the clay silicate layers with good dispersion. Rheomechanical spectrometry (RMS) was performed on the prepared nanocomposites. All dynamically vulcanized nanocomposites comprising 2.5% of OC exhibited shear-thinning behavior and non-terminal characteristics with a low frequency range. These indicate the formation of three-dimensional physical networks by the clay nanolayers throughout the LLDPE matrix. The presence of the bitumen in the composition of the prepared nanocomposites improved the flowability of the samples. This is a promising feature of the prepared nanocomposites to be used as an elastic and resistant modifier in the composition of the bitumen-based asphalts.
机译：合成了动态交联的热塑性弹性体纳米复合材料，作为基于沥青粘合剂的沥青的改性剂。线性低密度聚乙烯（LLDPE）和比例为80/20的丁苯橡胶（SBR），沥青和有机改性粘土（OC）在硫磺硫化体系的存在下全部熔融混合。所提出的混合是在内部混合器中在160摄氏度，转子转速为120 rpm的条件下进行的。为了增强聚合物相与粘土硅酸盐层之间的分子相互作用，将马来化度为50％的马来酸酐接枝的LLDPE（PE-g-MA）也掺入了混合物中。使用扫描电子显微镜（SEM）观察复合样品，发现所有动态硫化样品的基质分散型形态。 X射线衍射（XRD）和透射电子显微镜（TEM）检查证明具有良好分散性的粘土硅酸盐层的剥落。在制备的纳米复合材料上进行了流变力学光谱（RMS）。包含2.5％OC的所有动态硫化纳米复合材料均在低频范围内表现出剪切稀化行为和非末端特性。这些表明整个LLDPE基质中的粘土纳米层均构成了三维物理网络。制备的纳米复合材料的组合物中沥青的存在改善了样品的流动性。这是所制备的纳米复合材料的有希望的特征，其将被用作沥青基沥青组合物中的弹性和抗性改性剂。

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