The block co-polymer most commonly used in directed self-assembly research ([gettech id="31046" t_name="DSA"]), PS-b-PMMA (poly(styrene-block-methyl methacrylate) is an excellent choice because the two component monomers have similar surface energies. The exposed top surface of the film helps to stabilize the segregated domains, making it relatively easy to achieve the lamellar line-and-space p...
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