In the current study, we investigated poly-2-oxazolidones containing one of four different diglycidyl ethers carrying different bulky bisphenol centers. With increasing steric hindrance of the bisphenol-based diepoxide from bisphenol F to bisphenol A, Z and TMC, the glass transition temperature (T g ) increased markedly from 156 to 211 ∘ C, whereas the plateau modulus of the polymer, i.e. the chain flexibility as determined from rheological characterization, remained almost unchanged. This study demonstrates the general feasibility of the chemical design of poly-2-oxazolidones as an amorphous high-performance thermoplastic.

The incorporation of photochromic dyes into porous metal–organic frameworks (MOFs) is an attractive way to transfer the photochromic properties of the dye to a solid crystalline material.

We investigate all-inorganic perovskite CsPb x Sn1–x Br3 thin films to determine the variations in the band gap and electronic structure associated with the Pb/Sn ratio. We observe that the band gap can be tuned between 1.86 eV (x = 0) and 2.37 eV (x = 1). Intriguingly, this change is nonlinear in x, with a bowing parameter of 0.9 eV; furthermore, a slight band gap narrowing is found for low Pb content (minimum x ∼ 0.3). The wide tunability of the band gap makes CsPb x Sn1–x Br3 a promising material, e.g., for a wide-gap subcell in tandem applications or for color-tunable light-emitting diodes. Employing photoelectron spectroscopy, we show that the valence band varies with the Pb/Sn ratio, while the conduction band is barely affected.

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