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structure. The last step involves the immersion of the mould in a bath that dissolves the particles/salt lodged in the polymer matrix [68]. Figure 3.3.1. shows the main steps of the particulate leaching technique. Figure 3.3. The schematic diagram of solvent casting and particulate leaching technique. Reprinted with the permission of [69]. Generally, this technique produces highly porous structures (> 93%) with a thickness of up to 3mm [70]. A major drawback of particulate leaching is that it is not possible to design a well interconnected porous structure with regular and reproducible structure [71]. 3.4 Replica molding Replica moulding is a technique that allows transferring the desired pattern from an elastomeric mould into the surface of a polymer. This technique allows duplicating 3D structure shapes, sizes and patterns in a wide range of materials [72]. Typically, a patterned poly(dimethylsiloxane) (PDMS) layer functions as the mould that is used to transfer the pattern to the surface of another polymer (prepolymer) [73]. The polymer is carefully spread into the PDMS patterned mould, and the crystallisation will occur. Depending on the crystallisation 9PDF Image | Synthetic Polymer-based Membrane for Lithium Ion
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