Thermochromic Printable And Multicolor Polymeric Composite Based on Hybrid Organic-Inorganic Perovskite.Hybrid organic-inorganic perovskites (PVKs) are among the most promising materials for optoelectronic applications thanks to their outstanding photophysical properties and easy synthesis.  Herein, a new PVK-based thermochromic composite is demonstrated.  X-ray diffraction, Fourier-transform infrared spectroscopy, Differential Scanning Calometry, rheological and optical measurements carried out during heating/cooling cycles reveal that thermochromism in our material is based on a reversible process of PVK disassembly/assembly mediated by intercalating polymeric chains, through the formation and breaking of hydrogen bonds between polymer and perovskite.  Therefore, differently from other thermochromic perovskites, that generally work with the adsorption/desorption of volatile molecules, our system is able to perform several heating/cooling cycles regardless of environmental conditions.The color and transition temperature (from 70 to 120°C) can be tuned depending on the type of perovskite.Moreover, this thermochromic material is printable and can be deposited by cheap techniques, paving the way for a new class of smart coatings with an unprecedented range of colors. 
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