Chromogenic polymers are those polymers which have the ability to change their colour or other optical properties in response to a particular stimulus, including heat (thermochromic or thermotropic), pressure (piezochromic) or light (photochromic). This ability can arise through a number of different physical reactions, but essentially as a property it is either inherent or brought about with additives. These fascinating properties mean that interest in Chromogenic polymers has been increasing over several years and these polymers have a number of potential engineering applications, including in the packaging, medical and glazing industries.
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