Detlef (Fraunhofer Institute for Applied Polymer Research, Berlin, Germany) Lotzsch & Arno (Fraunhofer Institute for Applied Polymer Research, Berlin, Germany) Seeboth 
Thermochromic and Thermotropic Materials [PDF ebook] 

Chromogenic materials change their optical properties in response to an external stimulus. Due to their potential applications as light valve (e.g., in sun protecting glazing) or as temperature sensor, thermotropic, and thermochromic materials have come more and more into the focus of research and development. Commercialization of such high-tech pr