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Moldable clay-like unit for synthesis of highly elastic polydimethylsiloxane sponge with nanofiller modification

机译：用于纳米填料改性的高弹性聚二甲基硅氧烷海绵的可模制粘土状单元

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Polydimethylsiloxane (PDMS) sponges with nanofiller modification are gaining considerable attention because of their extraordinary performances in improving the qualities of polymer nanocomposites. However, the current synthesis methods limit the flexibility and stability of functional PDMS sponges. Herein, we present an ultrasound-assisted in situ polymerization approach to convert a novel clay-like PDMS nanocomposite into a functional PDMS sponge. Accessible ultrasound with low intensity can moderately regulate the cross-linking degree of PDMS oligomer to obtain only shape-controllable clay-like units for the scalable synthesis of a PDMS sponge with a high elasticity. In order to enhance the functionality, graphene nanosheets serve as a nanofiller uniformly distributed into the three-dimensional porous PDMS skeleton. The graphene-reinforced PDMS sponge (GRPS) exhibits mechanical stability and wettability, and is a better alternative to typically recyclable adsorbents in an oil–water separation system. Thus, the present synthesis method may pave a facile way for manufacturing functional PDMS sponges on a large scale.
机译：具有纳米填料改性的聚二甲基硅氧烷（PDMS）海绵由于在改善聚合物纳米复合材料质量方面的非凡性能而备受关注。然而，当前的合成方法限制了功能性PDMS海绵的柔性和稳定性。在这里，我们提出了一种超声辅助的“原位”聚合方法，将一种新型的粘土状PDMS纳米复合材料转变为功能性的PDMS海绵。具有低强度的可触及超声波可以适度调节PDMS低聚物的交联度，从而仅获得形状可控制的粘土状单元，以可扩展地合成具有高弹性的PDMS海绵。为了增强功能，石墨烯纳米片充当均匀分布在三维多孔PDMS骨架中的纳米填料。石墨烯增强的PDMS海绵（GRPS）具有机械稳定性和润湿性，是油水分离系统中通常可回收的吸附剂的较好替代品。因此，本发明的合成方法可以为大规模生产功能性PDMS海绵铺平道路。

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