Unsubstituted polythiophene, chemical

Two Hell UPS spectra of poly(3-hexylthiophene), or P3HT, compared with the DOVS derived from VEH band structure calculations [83], are shown in Figure 5-14. The general chemical structure of poly(3-alkylthiophene) is sketched in Figure 5-4. The two UPS spectra, were recorded at two different temperatures, -h190°C and -60 °C, respectively, and the DOVS was derived from VEH calculations on a planar conformation of P3HT. Compared to unsubstituted polythiophene, the main influence in the UPS spectra due to the presence of the hexyl... 

Unsubstituted polythiophene (PT) is an intractable material because it is neither soluble nor fusible, although films electrochemically prepared under certain conditions may be stretch-deformed. Generally speaking PT prepared by purely chemical routes turns out to be more crystalline than their electrochemical counterparts, as will be discussed in the following. 

In all cases of electrochemicaHy or chemically polymerized unsubstituted polypyrrole, the final polymer is intractable in both the conducting and insulating forms. In contrast, a broad number of substituted polythiophenes have been found to be processible both from solution and in the melt. The most studied of these systems ate the poly(3-alkylthiophenes) (P3AT). 

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