Thermochromism of poly (substituted thiophene) with urethane bond and its application to reversible thermal recording

• Published in: Synthetic metals Vol. 80; no. 1; pp. 67 - 72
• Main Authors: Hirota, Nobuaki, Hisamatsu, Naoki, Maeda, Shigehiro, Tsukahara, Hirokazu, Hyodo, Kenji
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 15-06-1996; Amsterdam Elsevier Science; New York, NY
• Subjects: Applied sciences; Exact sciences and technology; Long alkyl group; Organic polymers; Physicochemistry of polymers; Poly (substituted thiophene); Polymers with particular properties; Preparation, kinetics, thermodynamics, mechanism and catalysts; Reversible thermal recording; Thermochromism; Urethane bond; Urethane bond; Long alkyl group; Reversible thermal recording; Poly (substituted thiophene); Thermochromism; Thiophene derivative polymer; Optical properties; Preparation; Thermal recording; Recording material; Electrical conductor; Experimental study; Organic carbamate; Functional polymer
• ISSN: 0379-6779; 1879-3290
• DOI: 10.1016/0379-6779(96)80204-9

We synthesized a novel poly (substituted thiophene) which has a long alkyl group with a urethane bond at the 3-position of the thiophene ring. The UV-visible absorption and X-ray diffraction methods reveal thermochromic properties of the polymers, which show the possibility of applying them to reversible thermal recording. The color change of the polymer from brownish-red to yellow was fixed by heating and quenching to room temperature (heat-quenching method). The fixed yellow color returned to the initial color of brownish-red after annealing at 100 °C (annealing method).