Synthesis and characterization of electro-active starburst block copolymer precursors.

• Main Authors: Pei-Ze Huang, 黃培澤
• Other Authors: Leeyih Wang
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/10053315594930271449

碩士 === 國立臺灣大學 === 高分子科學與工程學研究所 === 92 === In this study, a novel route for preparing electro-active starburst macromolecular precursors based on core-first method has been developed. First, poly(n-butyl acrylate) stars were synthesized by ATRP (atom transfer radical polymerization) method using four, six or twelve functional alkyl halides as core molecules. Theω-bromo ends of these star polymers were subsequently modified to generate the same number of hydroxyl groups. Finally, the hydroxyl ends of the star polymers were then esterified with 3-thiophene acetic acid to form thiophene-capped starburst poly(n-butyl acrylate). The corresponding structures were identified by 1H-NMR and 13C-NMR. The studies of molecular weight characteristics of these thus-prepared star polymers were performed on 1H-NMR and GPC instruments. The preparation of electroactive starburst poly(n-butyl acrylate-b-3-hexyl thiophene) copolymers was carried out by growing poly(3-hexyl thiophene) chains from the terminated thiophene unit of four-armed stars via oxidative polymerization method. Chemical structure and molecular weight characteristics of these copolymers were studied by IR、NMR, and GPC techniques. The apparent red shift of the absorption peaks of the star copolymers compared with the thiophene-capped PBA stars in the UV-vis spectra reveals the formation of the conjugated chains on the end of each arm.