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Surface relief gratings formed by microphase-separated disperse red 1 acrylate-containing diblock copolymers

Abstract : Sinusoidal surface-relief gratings (SRGs) formed by microphase separated photoresponsive poly(dimethylsiloxane)-block-poly(methyl acrylate-co-disperse red 1 acrylate) (PDMS-b-P(MA-co-DR1A)) chains are investigated. Different PDMS-b-P(MA-co-DR1A) were prepared by a multi-step synthetic approach which overcomes the challenges inherent to the synthesis of well-defined PDMS-based block copolymers (BCPs) having a DR1A dye content up to 50 wt%. A sinusoidal SRG (amplitude ≈ 5 nm, wavenumber ≈ 315 nm) interferometrically inscribed onto a thin PDMS-b-P(MA-co-DR1A) layer exhibiting an out-of-plane cylindrical structure with a period of ∼34 nm is demonstrated. Such kind of “two-colored” multiscale patterned surfaces could be envisioned as guiding patterns to efficiently direct the self-assembly of a BCP upper-layer via a hybrid chemo-/grapho-epitaxial alignment of BCP features.
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Mitica Cezar Spiridon, Karim Aissou, Muhammad Mumtaz, Cyril Brochon, Eric Cloutet, et al.. Surface relief gratings formed by microphase-separated disperse red 1 acrylate-containing diblock copolymers. Polymer, Elsevier, 2018, 137, pp.378-384. ⟨10.1016/j.polymer.2018.01.032⟩. ⟨hal-01685087⟩

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