Temporally Stable Supramolecular Polymeric Salts Enabling High-Performance 3D All-Aromatic Polyimide Lattices.

Autor: Weyhrich CW; School of Molecular Sciences and Biodesign Center for Sustainable Macromolecular Materials and Manufacturing, Arizona State University, Tempe, AZ, 85281, USA., Will JW; Department of Materials Science and Engineering, Virginia Tech, Blacksburg, VA, 24061, USA.; Macromolecules Innovation Institute, Virginia Tech, Blacksburg, VA, 24061, USA., Nayyar G; School of Engineering of Matter, Transport, and Energy and Biodesign Center for Sustainable Macromolecular Materials and Manufacturing, Arizona State University, Tempe, AZ, 85281, USA., Westover CC; Department of Materials Science and Engineering and Biodesign Center for Sustainable Macromolecular Materials and Manufacturing, Arizona State University, Tempe, AZ, 85281, USA., Patterson S; Honeywell Federal Manufacturing and Technologies, LLC, Kansas City, MO, 64147, USA., Arrington CB; School of Molecular Sciences and Biodesign Center for Sustainable Macromolecular Materials and Manufacturing, Arizona State University, Tempe, AZ, 85281, USA., Williams CB; Macromolecules Innovation Institute, Virginia Tech, Blacksburg, VA, 24061, USA.; Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA, 24061, USA., Long TE; School of Molecular Sciences and Biodesign Center for Sustainable Macromolecular Materials and Manufacturing, Arizona State University, Tempe, AZ, 85281, USA.; School of Engineering of Matter, Transport, and Energy and Biodesign Center for Sustainable Macromolecular Materials and Manufacturing, Arizona State University, Tempe, AZ, 85281, USA.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2023 Aug; Vol. 19 (32), pp. e2303188. Date of Electronic Publication: 2023 May 10.
DOI: 10.1002/smll.202303188
Abstrakt: Vat photopolymerization (VP) Additive Manufacturing (AM), in which UV light is selectively applied to cure photo-active polymers into complex geometries with micron-scale resolution, has a limited selection of aliphatic thermoset materials that exhibit relatively poor thermal performance. Ring-opening dianhydrides with acrylate-containing nucleophiles yielded diacrylate ester-dicarboxylic acids that enabled photo-active polyimide (PI) precursors, termed polysalts, upon neutralization with an aromatic diamine in solution. In situ FTIR spectroscopy coupled with a solution and photo-rheological measurements revealed a previously unknown time-dependent instability of 4,4'-oxydianiline (ODA) polysalts due to an aza-Michael addition. Replacement of the electron-donating ether-containing diamine with an electron withdrawing sulfone-containing monomer, e.g., 4,4'-diaminodiphenyl sulfone (DDS), prohibited the aza-Michael addition of the aromatic amine to the activated acrylate double bond. Novel DDS polysalt photocurable solutions are similarly analyzed and validated long-term stability, which enabled reproducible printing of polyimide organogel intermediates. Subsequent VP AM afforded 3-dimensional (3D) structures of intricate complexity and excellent surface finish, as demonstrated with scanning electron microscopy. In addition, the novel PMDA-HEA/DDS solution enabled the production of the first beam latticed architecture comprised of all-aromatic polyimide. The versatility of a polysalt platform for multi-material printing is further demonstrated by printing parts with alternating polysalt compositions.
(© 2023 Wiley-VCH GmbH.)
Databáze: MEDLINE
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