Abstract
A thermocoloration system consisting of a fluorane leuco dye (FR) and an iodonium salt (DPIOB) was investigated. The color for the FR/DPIOB system posseses a highly colored stability. The rates of the color development reaction show a rapid rise with increase in temperature, and, owing to two kinds of different activation energy (E a) at the range of reaction temperature in the polymeric film, the reaction easily occurs in the high temperature region (>104°C). The thermal susceptibility increases with increase of FR/DPIOB content. A mechanism of thermocoloration via an electron transfer process is proposed. FR is oxidized to the FR +• radical, the iodonium cation is reduced to the diphenyl iodine radical, which then rapidly decomposes to iodobenzene and the phenyl radical. The ring opened cationic ester (FR-Ph) is formed by radical coupling between FR +• and the phenyl radical.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
