Stabilizing network structures of block copolymers by end-group and linker chemistry
발표자
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초록
내용
Network morphologies of functional block copolymer systems were connected to enhanced device performance in literature. Unfortunately, accessing thermally stable network structures from linear block copolymers has not been trivial because they exist in narrow window of phase diagram. In this work, we investigate a methodology to stabilize the diverse network morphologies from diblock copolymers upon precisely controlling the packing frustration. A set of polystyrene-b-poly(ethylene oxide) block copolymers were prepared and the end of PEO chain was modified by various di-end-functional groups through different synthetic routes. This resulted in the development of various network structures of Ia3d, Fddd, and Im3m, depending on the linker molecules. Further, the stability of medial chain packing over skeletal packing was determined by the interplay between the strength of end-end interactions and the initial shape of curvature. MD simulations revealed the considerable increases in the interfacial area as a result of di-end group attachment, sufficiently to induce percolated structures.