Poly(3-n-pentylthiophene) and poly(3-n-hexylthiophene) were prepared using a potentiostatic method and were characterized by gel permeation chromatography in tetrahydrofuran. In general, the molecular weight of the polymers increased as the applied potential was increased in the range of 1.3-1.7 V (versus saturated calomel electrode). The presence of 2,2'-bithiophene in the polymerization system resulted in a slight decrease in molecular weight but the polymer chains had a higher regularity as evidenced by longer ~-conjugation length. At potentials of > 1.9 V, the molecular weight decreased because of polymer degradation. The results strongly support the electrophilic aromatic substitution mechanism for electrochemical polymerization of thiophene monomers.
Посилання на статтю:
A gel permeation chromatography study of electrochemically synthesized poly (3-alkylthiophene) s / Yen Wei* and Jing Tian // Polymer. – 1992. – Vol 33. – P. 4872-4874.