Abstract
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±14.8nm. 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.
Highlights
In this work, the preparation and fabrication of elastomeric opal films materials over the last decades.[1,2,3] The most interesting building block for revealing reversible mechanochromic and pH-responsive features are photonic materials is represented by reported
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 cally feature iridescent reflection colors caused by Bragg diffraction of visible light.[6,7,8,9]
Reviews dealing with self-assembled photonic materials and applications thereof are given by Galisteo-López structural colors based on Bragg’s law of diffraction
Summary
The preparation and fabrication of elastomeric opal films materials over the last decades.[1,2,3] The most interesting building block for revealing reversible mechanochromic and pH-responsive features are photonic materials is represented by reported. The hard core/soft shell particles were designed using starved-feed emulsion polymerization, which was tailored for: i) the convenient melt-shear organization, that is, shear-induced ordering of the particles, ii) subsequent thermally induced crosslinking strategies for gaining access to mechanochromic features, and iii) the incorporation of organic dyes or dye-functionalized copolymers as matrix additives.
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