Alternative Aspects of Polythiophenes
Syntheses of high-molecular-weight (Mw up to 880 k) and high regioregular (head-to-tail >99%) poly(3-hexylthiophene) (P3HT) were first described. Self-standing film could be only obtained using high Mw P3HT. Molecular orientation in the P3HT thin film was generally known as edge-on structure; however, thin film with high Mw P3HT spin-coated on hydrophilic substrate at low temperature was found to show flat-on rich structure. By substituting side chains from hexyl groups to disiloxane moieties (P3SiT), fragile issue of P3HT (elongation at break <15%) could be overcome. This is because high Mw P3SiT gave low Tg (−10 °C), which resulted in high elongation at break (more than 200%). These alternative novel futures of polythiophenes as element-block polymers were described.
KeywordsPolythiophene Self-standing film Siloxane moiety High molecular weight Face-on
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