Please use this identifier to cite or link to this item: doi:10.22028/D291-39774
Title: Complex 3D‐Printed Mechanochromic Materials with Iridescent Structural Colors Based on Core–Shell Particles
Author(s): Siegwardt, Lukas
Gallei, Markus
Language: English
Title: Advanced Functional Materials
Volume: 33
Issue: 15
Publisher/Platform: Wiley
Year of Publication: 2023
Free key words: additive manufacturing
colloidal crystals
emulsion polymerization
stimuli-responsive polymers
DDC notations: 500 Science
Publikation type: Journal Article
Abstract: A scalable protocol for design and subsequent 3D-printing of polymeric coreshell-particles is reported. The particle synthesis by emulsion polymerization in starved-feed mode is used for tailoring particle architecture and composition. Control of size, mechanical properties, and chemical functionalities allow to achieve the specific requirement profile for subsequent extrusion-based additive manufacturing. The core-shell particles consist of hard polystyrene cores and a comparably soft polyalkylacrylate-based shell. Size and monodispersity, as well as core-to-shell ratio, are determined by means of dynamic light scattering and transmission electron microscopy. Thermal and rheological properties are investigated by means of dynamic scanning calorimetry and thermogravimetric analysis as well as oscillation and capillary rheometry. During 3D-printing, the monodisperse particles self-assemble into an ordered close packed lattice structure, leading to visible reflection colors according to Bragg’s law of diffraction. Distinct and angle-dependent reflection colors are recorded via UV-vis spectroscopy. As the structural color depends, inter alia, on the underlying particle sizes, resulting colors are easily tunable by adjusting the applied synthesis parameters. Under mechanical deformation, the color changes due to controlled lattice deformation, which enables mechanochromic sensing with the printed objects. They are also promising candidates for decorative ornaments, smart optical coatings, or advanced security devices.
DOI of the first publication: 10.1002/adfm.202213099
URL of the first publication:
Link to this record: urn:nbn:de:bsz:291--ds-397740
ISSN: 1616-3028
Date of registration: 16-May-2023
Description of the related object: Supporting Information
Related object:
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Chemie
Professorship: NT - Prof. Dr. Markus Gallei
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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