Two-step thermochromism in poly(3-docosoxy-4-methylthiophene): Mechanistic similarity to poly(3-docosylthiophene)
Date of Original Version
The two-step thermochromism in poly(3-docosoxy-4-methylthiophene) by using reflection and fluorescence spectroscopies and differential scanning calorimetry (DSC) was investigated. The polymer sample was prepared for DSC by drip-coating a solution of the polymer in tetrahydrofuran (THF) on the aluminum foil and evaporating the solvent. The polymer film was heated with a heat gun and rapidly quenched with liquid nitrogen to form the mesophase. Variable-temperature fluorescence spectra were recorded on Ocean Optics S2000 instrument with a blue LED light source (λ = 470 nm). The fluorescence spectrum (excited at 470 nm) of the mesophase contained a weak, broad emission with a maximum centered at ~650 nm. The emission band of the high temperature phase had peaks at 540 and 565 nm, with much greater intensity than the emission band of the mesophase.
Journal of Polymer Science, Part A: Polymer Chemistry
Chalasani, Dinesh, Joshua K. Potvin, Brett L. Lucht, and William B. Euler. "Two-step thermochromism in poly(3-docosoxy-4-methylthiophene): Mechanistic similarity to poly(3-docosylthiophene)." Journal of Polymer Science, Part A: Polymer Chemistry 48, 19 (2010): 4370-4373. doi:10.1002/pola.24236.