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Mechanical Properties and Processing Techniques of Bulk Metal–Organic Framework Glasses

Li, Shichun; Limbach, René; Longley, Louis; Shirzadi, Amir A.; Walmsley, John C.; Johnstone, Duncan N.; Midgley, Paul A.; Wondraczek, Lothar and Bennett, Thomas D. (2019). Mechanical Properties and Processing Techniques of Bulk Metal–Organic Framework Glasses. Journal of the American Chemical Society, 141(2) pp. 1027–1034.

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Melt quenched metal–organic framework (MOF) glasses define a new category of glass, distinct from metallic, organic, and inorganic glasses, owing to the dominant role of metal–ligand coordination bonding. The mechanical properties of glasses in general are important given their application in protective coatings and display technologies, though little is known about MOF glasses in this respect. The experimental elucidation of key properties such as their scratch resistance has been limited by the lack of processing methodologies capable of producing bulk glass samples. Here, nanoindentation was used to investigate the Young’s modulus and hardness of four melt-quenched glasses formed from zeolitic imidazolate frameworks (ZIF): agZIF-4, agZIF-62, agZIF-76, and agZIF-76-mbIm. The creep resistance of the melt-quenched glasses was studied via strain-rate jump (SRJ) tests and through constant load and hold (CLH) indentation creep experiments. Values for the strain-rate sensitivity were found to be close to those for other glassy polymers and Se-rich GeSe chalcogenide glasses. Vacuum hot-pressing of agZIF-62 resulted in an inhomogeneous bulk sample containing the glass and amorphous non-melt-quenched aZIF-62. Remelting and annealing, however, resulted in the fabrication of a transparent, bubble-free bulk specimen, which allowed the first scratch testing experiments to be performed on an MOF glass.

Item Type: Journal Item
Copyright Holders: 2018 American Chemical Society
ISSN: 1520-5126
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 58576
Depositing User: Amir Shirzadi
Date Deposited: 14 Jan 2019 09:31
Last Modified: 25 Dec 2019 04:22
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