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Article

Co-Processing of [Fe(NH2trz)3](2ns)2 and UHMWPE into Materials Combining Spin Crossover and High Mechanical Strength

Department of Materials, ETH Zürich, Vladmir-Prelog-Weg 5, 8093 Zürich, Switzerland
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Author to whom correspondence should be addressed.
Received: 11 August 2020 / Revised: 4 December 2020 / Accepted: 23 December 2020 / Published: 7 January 2021
(This article belongs to the Special Issue Feature Papers 2020 Editors' Collection)
The coordination polymer [Fe(NH2trz)3](2ns)2 (NH2trz = 4-amino-1,2,4-triazole and 2ns = counterion 2-naphthalene sulfonate) exhibits the rare phenomenon of spin crossover in an attractive temperature range, i.e., somewhat above room temperature. Spin crossover in [Fe(NH2trz)3](2ns)2 is manifested by thermochromism, which is accompanied by a magnetic transition from diamagnetism to paramagnetism. However, [Fe(NH2trz)3](2ns)2 is brittle and difficult to process, which limits its use. In this study, we show that [Fe(NH2trz)3](2ns)2 can be co-processed with ultrahigh molecular weight polyethylene (UHMWPE), which possesses outstanding mechanical properties, particularly when tensile-drawn. Therefore, [Fe(NH2trz)3](2ns)2–UHMWPE blends were gel-processed by extrusion, employing a relatively poor solvent, which has recently been shown to offer advantages compared to good solvents. Uniform and flexible films, ribbons and fibers with [Fe(NH2trz)3](2ns)2 fractions as high as 33.3% m/m were obtained that could be readily drawn. Spin crossover in the coordination polymer is retained in these materials, as evident from their thermochromism. The tensile strength and Young’s modulus of the blends exceed those of typical commodity polymers. Thus, the films, ribbons and fibers constitute a special class of multifunctional materials that combine the flexibility and excellent mechanical properties of drawn UHMWPE with the spin crossover behavior of [Fe(NH2trz)3](2ns)2. View Full-Text
Keywords: coordination polymers; spin crossover; thermochromism; polyethylene; blends; uniaxial solid-state drawing coordination polymers; spin crossover; thermochromism; polyethylene; blends; uniaxial solid-state drawing
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MDPI and ACS Style

Baumgartner, M.; Schaller, R.; Smith, P.; Weymuth, I.; Caseri, W. Co-Processing of [Fe(NH2trz)3](2ns)2 and UHMWPE into Materials Combining Spin Crossover and High Mechanical Strength. Sci 2021, 3, 7. https://doi.org/10.3390/sci3010007

AMA Style

Baumgartner M, Schaller R, Smith P, Weymuth I, Caseri W. Co-Processing of [Fe(NH2trz)3](2ns)2 and UHMWPE into Materials Combining Spin Crossover and High Mechanical Strength. Sci. 2021; 3(1):7. https://doi.org/10.3390/sci3010007

Chicago/Turabian Style

Baumgartner, Manuel, Raphael Schaller, Paul Smith, Irene Weymuth, and Walter Caseri. 2021. "Co-Processing of [Fe(NH2trz)3](2ns)2 and UHMWPE into Materials Combining Spin Crossover and High Mechanical Strength" Sci 3, no. 1: 7. https://doi.org/10.3390/sci3010007

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