Synthesis, Purification, and Characterization of Well-Defined All-Conjugated Diblock Copolymers PF8TBT-b-P3HT

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• 作者：Michael Sommer ; Hartmut Komber ; Sven Huettner ; Rhiannon Mulherin ; Peter Kohn ; Neil C. Greenham ; Wilhelm T. S. Huck
• 刊名：Macromolecules
• 出版年：2012
• 出版时间：May 22, 2012
• 年：2012
• 卷：45
• 期：10
• 页码：4142-4151
• 全文大小：587K
• 年卷期：v.45,no.10(May 22, 2012)
• ISSN：1520-5835

文摘

We present the synthesis, purification, and characterization of all-conjugated block copolymers comprising poly((9,9-dioctylfluorene)-2,7-diyl-alt-[4,7-bis(3-hexylthien-5-yl)-2,1,3-benzothiadiazole]-2鈥?2鈥?diyl) (PF8TBT) and poly(3-hexylthiophene) (P3HT). Suzuki step-growth polycondensation is used for the synthesis of PF8TBT, which is subsequently terminated via the addition of narrow-distributed, monobrominated P3HT-Br. Purification via preparative GPC is carried out to reduce polydispersity and to remove excess P3HT. Wavelength-dependent GPC and careful NMR end group analysis, assisted by model compounds, reveal pure diblock copolymers of PF8TBT-b-P3HT. Insight into structure formation is given by temperature-dependent UV鈥搗is absorption, DSC, and X-ray scattering. These indicate that PF8TBT-b-P3HT does not microphase-separate within the investigated range of composition and molecular weight. The critical role of introducing sufficient dissimilarity between the segments in all-conjugated block copolymers in order to induce phase separation is discussed, with the conclusion that careful tuning of side chains is crucial for achieving self-organization.