Molecular Order, Conformation in Solid State

Crystallinity, Molecular Order, Conformation in Solid State 

Electrochemically prepared alkylated polythiophenes have been investigated by Gamier and coworkers.90 91 When comparing polythiophene and monosubstituted polyalkylthiophenes, these workers found an increase in crystallinity of the substituted thiophenes in comparison to the unsubstituted poly thiophene. The degree of crystallinity was low (5%), but the crystal structure was assigned to a hexagonal cell 

The him morphology of electrochemically prepared polythiophene has been shown in numerous studies to be almost identical to that commonly observed for polypyrrole (described in Chapter 2). A nodular surface is observed for both unsubstituted and 3-alkyl substituted thiophenes.92 As with PPy, the electrochemical preparation of PTh at higher current densities produced rougher surface morphologies. The similarity in morphologies suggest a similar growth mechanism for electrochemically polymerized PPy and PTh. 

It is apparent that the determinants of the PTh morphology are complex, as with other conducting polymers. However, the effects on mechanical and electrical properties, as well as switching properties, are likely to be significant and worthy of further investigation. 

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Crystallinity, molecular order, conformation in solid state Morphology and Density Properties of polythiophenes Conductivity... 

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