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Engineering oriented hierarchical lamellar structures in SBS/PS blends via a pressure-induced flow field

机译：通过压力诱导的流场在SBS / PS中的工程取向位层层结构

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Inorganic materials with a hierarchical lamellar architecture based on bio-inspired design principles found in seashell nacre and bone are expected to have high performance. Recently, great progress has been achieved in the fabrication of thin films, while incorporation of these supramolecular designs into synthetic polymer materials in the bulk still faces a great challenge. We demonstrate how a hierarchical layered micro- and nano-structure can be generated in the bulk from a variety of polymer blends such as polystyrene/poly(styrene–butadiene–styrene) (PS/SBS) as a model compound reported herein via a pressure-induced flow field technique. In this blend system, minority spherical rubbery SBS in these PS/SBS blends was biaxially deformed into lamellae having nanometer scale thickness within a rigid glassy PS phase as indicated by transmission electron microscopy and small angle X-ray scattering experimental results. Benefiting from such a hierarchical lamellar structure, the resulting strength, stiffness and toughness along the lamellar normal direction were simultaneously enhanced, while the modulus remained constant. The enhanced strength of the blend system resulted from the orientation of the macromolecules at and near the phase-separated boundaries of the lamellar domains within the PS matrix, as indicated by infrared spectroscopy results. The mechanism of this remarkably increased toughness was due to the fact that the crazes generated during impact experiments were efficiently terminated by the SBS lamellar domain. Such a biomimetic design for rubber-toughened glassy materials could also be easily transferred into other materials consisting of either blends of two immiscible polymers or semi-crystalline polymers through this efficient pressure-induced flow field technique.
机译：预计基于贝壳和骨骼中发现的生物启发设计原则的具有等级层层架构的无机材料预计将具有高性能。最近，在薄膜的制造中取得了巨大进展，同时将这些超分子设计掺入散装中的合成聚合物材料仍面临着巨大的挑战。我们证明了如何从各种聚合物共混物如聚苯乙烯/聚（苯乙烯 - 丁二烯 - 苯乙烯）（PS / SBS）的各种聚合物共混物中产生分级层状微型和纳米结构，作为通过压力报道的模型化合物 - 诱导的流场技术。在该混合系统中，这些PS / SBS共混物中的少数群体球形橡胶SBS在刚性玻璃PS相位内具有纳米垢厚度的薄片，如通过透射电子显微镜和小角度X射线散射实验结果所示。受益于这种层级层状结构，同时提高了沿着层状正常方向的所得强度，刚度和韧性，而模量仍然是恒定的。与红外光谱结果所示，共混物系统的增强强度由大分子的桡骨的取向和靠近PS基质内的层状结构域的相分离边界。这种显着增加的韧性的机制是由于SBS层状结构域有效地终止了冲击实验期间产生的裂纹。这种用于橡胶增韧玻璃材料的仿真设计也可以通过这种有效的压力诱导的流场技术容易地转移到由两个不混溶的聚合物或半结晶聚合物的共混物组成的其他材料中。

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