Synthesis, Properties Of Poly(Thiophene) Block Copolymer And Benzothieno[3,2-b][1] Benzothiophene

Thiophene unit containing sulfur atom is an important five-membered heterocyclicring with aromatic nature, plays a significance role in expanding the field of organicsemiconductor materials. Semiconductors composed of thiophene unit own flexiblestructure, diverse intermolecular forces will turn into the future stars in the field oforganic thin-film transistors. In this thesis, we synthesized C10-BTBT and P3HTtriblock copolymers, study on preparation, properties of optical, electrical and thermal.The main research is as follows:(1) Small molecules: C10-BTBT was synthesized in the base ofο-chlorobenzaldehyde, NaSH.xH2O and decanoyl chloride by elimination reaction,acrylation reaction and reduction reaction. The OTFT devices with bottom-gate andtop-contact structure based on C10-BTBT were prepared by inkjet printing method, theaverage field-effect mobility was up to0.1cm2/V s and the maximum mobility was0.25cm2/V.s, the on/off curruent ratio exceeded104. OTFT devices were placed in airfor different times, The on/off ratio of organic thin-film transistor had no morechanges.(2) Block copolymer: according to the principle of SBS thermoplasticelastomers(TPES), we synthesized a series of P3HT triblock copolymers withdifferent molecules weight through ATRP, azide reaction and click reaction. Thecopolymers were confirmed by HNMR and GPC. We study on preparation, propertiesof optical, electrical, mechanic based copolymers. The results indicated that thesecopolymers behaved as a thermoplastic elastomer with a Young’s modulus of6MPafor an elongation at break of140%. Higher molar mass blocks would lead to betterthermoplastic elastomer.(3) The OTFT devices based on triblock copolymers were prepared by spin coatingand drop casting. We study on the influence of the OTFT performance with thedifferent components of P3HT as well as stretching ratio. The results demonstratedthat the mobility was up to9×10-4cm2/Vs with55%P3HT and the higher molar massP3HT blocks should improve the field-effect mobility. The results also indicated thedevices keep transistor characteristics at an elongation of60%.