Master of Science (MS)
This work is focused on the design, synthesis and characterization of block copolymers (BCPs) containing both conjugated and polyelectrolyte blocks. This type of rod-coil BCP is considered to have microphase separation which is different compared to coil-coil BCPs. The conjugated block used for studies is regioregular poly(3-alkylthiophene) (P3AT), which can be synthesized by Grignard metathesis (GRIM) polymerization. The polyelectrolyte block used is polystyrene sulfonate with well-defined structure, which can be synthesized by atom transfer radical polymerization (ATRP). Chapter II is focused on evaluation of synthetic routes for P3EHT-b-PSS, including using bifunctional initiator to synthesize both blocks, and separately synthesizing end-functionalized polymer blocks for Cu-Catalyzed Azide-Alkyne Cycloaddition (CuAAC). The advantages and disadvantages of these synthetic routes were summarized to find the best to synthesize P3EHT-b-PSS. Chapter III is focus on the detailed synthesis of propynyl-terminated P3EHT and azido-terminated PNSS, which are the two blocks used for CuAAC to synthesize P3EHT-b-PNSS. The optimum conditions for synthesizing both blocks were found. This synthetic route can achieve better MW, PDI and end-group control compared to other reported synthetic attempts for similar end-group functionalities. CuAAC was also tried to synthesize P3EHT-b-PNSS by using previously mentioned polymer blocks.
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Liu, Zhaoyuan, "Synthetic Approach towards P3EHT-b-PSS Conjugated and Ionic Block Copolymer" (2016). LSU Master's Theses. 1042.