Synthesis, Morphology, and Field-Effect Transistor Characteristics of Crystalline Diblock Copolymers Consisted of Poly(3-hexylthiophene) and Syndiotactic Polypropylene

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• 作者：Jing-Yu Lee ; Chih-Jung Lin ; Chen-Tsyr Lo ; Jing-Cherng Tsai ; Wen-Chang Chen
• 刊名：Macromolecules
• 出版年：2013
• 出版时间：April 23, 2013
• 年：2013
• 卷：46
• 期：8
• 页码：3005-3014
• 全文大小：647K
• 年卷期：v.46,no.8(April 23, 2013)
• ISSN：1520-5835

文摘

We report the synthesis, morphology, and the field effect transistor (FET) characteristics of the crystalline diblock copolymers of poly(3-hexylthiophene) and syndiotactic polypropylene (P3HT-b-sPP). Four diblock copolymers with various sPP block lengths, P3HT_16K-b-sPP_3K (P1), P3HT_16K-b-sPP_6K聽(P2), P3HT_16K-b-sPP_9K聽(P3), and P3HT_16K-b-sPP_14K (P4), were prepared by the click coupling of N₃-capped sPP and ethynyl-capped P3HT. The stereoregular crystalline block sPP developed different types of molecular stacking structures and led the P3HT domains to pack lamellar edge-on structure with improved charge transporting characteristics, as evidenced by the grazing incidence wide-angle X-ray scattering (GIWAXS), atomic force microscopy (AFM), and transmission electron microscopy (TEM). The FET hole mobilities of P1鈥揚3 thin films were 4.15 脳 10^鈥?, 4.16 脳 10^鈥?, and 3.95 脳 10^鈥? cm² V^鈥? s^鈥?, respectively, which were up to 1 order of magnitude higher than that of the parent P3HT thin film (1.43 脳 10^鈥? cm² V^鈥? s^鈥?). The crystalline-stereoregular crystalline diblock P3HT-b-sPP demonstrates that using the lattice matching concept could well clarify the molecular stacking structure of conjugated polymer segments in order to further improve the performance of organic electron devices.