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Dye-Loaded Mechanochromic and pH-Responsive Elastomeric Opal Films

  • In this work, the preparation and fabrication of elastomeric opal films revealing reversible mechanochromic and pH-responsive features are reported. The core–interlayer–shell (CIS) particles are synthesized via stepwise emulsion polymerization leading to hard core (polystyrene), crosslinked interlayer (poly(methyl methacrylate-co-allyl methacrylate), and soft poly(ethyl acrylate-co-butyl acrylate-co-(2-hydroxyethyl) methacrylate) shell particles featuring a size of 294.9 ± 14.8 nm. This particle architecture enables the application of the melt-shear organization technique leading to elastomeric opal films with orange, respectively, green brilliant reflection colors dependent on the angle of view. Moreover, the hydroxyl moieties as part of the particle shell are advantageously used for subsequent thermally induced crosslinking reactions enabling the preparation of reversibly tunable mechanochromic structural colors based on Bragg's law of diffraction. Additionally, the CIS particles can be loaded upon extrusion or chemically by a postfunctionalization strategy with organic dyes implying pH-responsive features. This convenient protocol for preparing multi-responsive, reversibly stretch-tunable opal films is expected to enable a new material family for anti-counterfeiting applications based on external triggers.

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Document Type:Article
Author:Tamara WinterORCiD, Anna Boehm, Volker PresserORCiD, Markus GalleiORCiD
Parent Title (English):Macromolecular Rapid Communications
First Page:2000557
Year of first Publication:2021
Release Date:2022/08/08
Tag:Elastomeric opals; Functional polymers; Photonic crystals; Self-assembly; Stimuli-responsive materials
Impact:05.006 (2021)
Funding Information:Deutsche Forschungsgemeinschaft (GA2169/5‐1)
DDC classes:500 Naturwissenschaften und Mathematik / 540 Chemie
Open Access:Open Access
Signature:INM 2021/011
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International