含噻吩星狀共聚高分子的合成與鑑定

Synthesis and Characterization of Thiophene-Based Star-Like Copolymers

蘇民坤(Ming-Kun Su)

指導教授 ： 詹益慈

國立臺灣大學/理學院/化學研究所/碩士(2016年)

https://doi.org/10.6342/NTU201610298

摘要

無資料

關鍵字

聚噻吩 ； 星狀共聚高分子 ； 各向異性排列

並列摘要

Poly(3-hexylthiophene) (P3HT) has been widely used in organic photovoltaics because of its ease of synthesis, high hole mobility, and relatively efficient light absorption in the visible-light range. However, due to the high crystallinity of P3HTs, most of them assembled into lamellar structures. Therefore, in order to explore other possible morphologies, our strategy is to synthesize a series of well-defined P3HT-based star-like copolymers containing branched alkylated thiophene monomers.
The star-like homopolymers were composed of polyphenylacetylene or polythienylacetylene as the core and poly(3-alkylthiophene) (P3AT) as the arms. It has been recently documented that Kumada catalyst-transfer polycondensation (KCTP) with a chain-growth mechanism is able to produce well-defined conjugated polymers. Firstly, the P3HTs with controlled molecular weight and low polydispersity were prepared through KCTP method. After transforming the end-functional groups into ethynyl groups, star-like polymers were synthesized by the “arm-first“ concept in the presence of the rhodium(I) catalyst. After successfully obtaining star-like polymers, we observed that the high crystallinity still drove the polymer morphology to lamellar structures, which were similar to the corresponding macromonomers. To disrupt the strong π-π interactions between P3HT chains, we utilized the 3-(2-ethylhexyl)thiophene to generate star-like copolymers. Unexpectedly, the highly 1D-oriented free-standing films of the star-like copolymers were obtained via a simple rotary evaporation process. To solve the puzzle, we not only fine-tuned the copolymer composition, but also examined how the substrate surfaces influence the degree of orientation in the free-standing films. Finally, their physical properties and optical properties were also investigated.

並列關鍵字

polythiophene ； star-like polymer ； orientated free-standing film

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