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Form, function and functionality of two dimeric toluene‐2,4‐diisocyanate polymorphs

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2,4‐Dioxo‐1,3‐diazetidine‐1,3‐bis(methyl‐m‐phenylene) diisocyanate (dimerized toluene‐2,4‐diisocyanate, TDI) is one of the most widely used aromatic diisocyanates in the polymer industry, and it crystallizes in at least two polymorphic forms (form A and form B) depending on reaction conditions. The crystal structures of the two forms were determined from high‐resolution laboratory X‐ray powder diffraction data using simulated annealing and Rietveld refinement. In spite of a marked structural similarity between them, significant discrepancies in the physical properties of the two forms prompted analysis of their partitioned energy terms in an effort to better our understanding of the driving force behind such differences in behaviour.
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Document Type: Research Article

Affiliations: Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany

Publication date: 2012-04-01

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