Size-controlled self-assembly of anisotropic sepiolite fibers in rubber nanocomposites
Size-controlled self-assembly of anisotropic sepiolite fibers in rubber nanocomposites
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DOI：
10.1016/j.clay.2017.10.032
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发表时间：
2018-02-01
影响因子：
5.6
通讯作者：
Morazzoni, Franca
中科院分区：
文献类型：
--
作者：
Di Credico, Barbara;Cobani, Elkid;Morazzoni, Franca
先进的聚合物纳米复合材料的发展需要填料-聚合物界面的相互作用和最佳的填料纳米分散性。由于分散性差和宏观颗粒尺寸较大，将粘土加入到聚合物基质中通常不会改善复合材料的力学性能。在这项工作中，通过酸处理对原始的和有机改性的海泡石(SEP)进行结构改性，使纳米海泡石(NS-SEP)纤维的颗粒尺寸变小，表面硅醇基团增加。利用NS-SEP纤维制备了具有增强力学性能的丁苯橡胶纳米复合材料，对粘土聚合物纳米复合材料的动态力学分析表明，NS-SEP纤维在增强和滞后行为之间取得了良好的平衡，与大尺寸原始SEP和各向同性白炭黑相比，NS-SEP纤维具有良好的增强和滞回性能。这与NS-SEP与橡胶的界面化学作用增强以及各向异性纳米纤维的尺寸和自组装形成填充网络结构有关，通过简单而通用的酸处理获得的SEP纳米纤维制备纳米复合材料，可以被认为是设计先进粘土聚合物纳米复合材料的一种替代方法。
The development of advanced polymer nanocomposites requires a strong filler-polymer interfacial interaction and an optimal filler nanodispersion. The incorporation of the clays into a polymer matrix frequently does not improve the composite mechanical properties, owing to both poor dispersion and macroscopic particle dimensions. In this work, pristine and organically-modified sepiolites (Sep) were structurally modified by an acid treatment, which provides nano-sized sepiolite (NS-Sep) fibers with reduced particle size and increased silanol groups on the surface layer. NS-Sep fibers were used to prepare styrene-butadiene rubber nanocomposites with enhanced mechanical properties.Dynamic-mechanical analysis of clay polymer nanocomposites demonstrated that the NS-Sep fibers provided an excellent balance between reinforcing and hysteretic behavior, compared to the large-sized pristine Sep and isotropic silica. This was related to the enhanced interfacial chemical interaction between NS-Sep and rubber, as well as to the size and self-assembly of anisotropic nanofibers to form filler network structures, as supported by transmission electron microscopy analysis.The preparation of nanocomposites, based on Sep nanofibers obtained by a simple and versatile acid treatment, can thus be considered an alternative approach for the designing of advanced clay polymer nano composites.