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首页> 外文期刊>Journal of Applied Polymer Science >SAXS study applied to reversibly crosslinked isotactic polypropylene/clay nanocomposites
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SAXS study applied to reversibly crosslinked isotactic polypropylene/clay nanocomposites

机译：SAXS研究应用于可逆交联的全同立构聚丙烯/粘土纳米复合材料

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摘要

A new route based on reversibly crosslinking reactive extrusion is applied for the development of iPP/clay nanocomposites. Analysis of small-angle X-ray scattering (SAXS) reflections of isotactic polypropylene (iPP)/clay nanocomposites, prepared by two different mixing and chemical crosslinking methods (i.e., conventional and in situ), is presented and results are compared with preceding wide-angle X-ray diffraction (WAXD) results. It is shown that the presence of clay significantly affects the value of long spacing in iPP, as well as the coherence length of lamellar stacks. Results show that the size of the coherently diffracting nanodomains decreases in two stages, first rapidly and then slowly as a function of increasing clay content. This can be attributed to the influence of confined iPP lamellae under the effect of rising number of clay particles. The appearance of the γ-crystalline form in the crosslinked iPP/clay nanocomposites is related with the difficulty in chain folding of iPP chains introduced by the chemical crosslinking process, as well as by the presence of clay particles.
机译：基于可逆交联反应挤出的新路线被用于开发iPP /粘土纳米复合材料。介绍了通过两种不同的混合和化学交联方法（即常规方法和原位方法）制备的等规聚丙烯（iPP）/粘土纳米复合材料的小角X射线散射（SAXS）反射分析，并将结果与​​先前的比较角X射线衍射（WAXD）结果。结果表明，粘土的存在会显着影响iPP中长间距的值以及层状叠层的相干长度。结果表明，随着粘土含量的增加，相干衍射纳米域的大小分两个阶段减小，首先迅速减小，然后缓慢减小。这可以归因于在增加的粘土颗粒数量的影响下，约束的iPP薄片的影响。交联的iPP /粘土纳米复合材料中γ晶形的出现与通过化学交联过程以及粘土颗粒的存在而导致的iPP链的链折叠困难有关。

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