Synthesis and characterization of -heterofunctional poly(ethylene oxide) macromonomers

Etilen oksidin (EO) anyonik yaşayan polimerizasyonu makromonomer sentezinde kullanıldı. Bu amaçla, metakriloil ve tienil uç grupları bulunan yeni bir a,w-heterofonksiyonel poli(etilen oksit) (PEO) makromonomeri halka-açılımı polimerizasyonu ile yüksek vakumda sentezlendi. Polimerizasyon potasyum tieniletoksit ile başlatıldı ve 40 0C’ de üç gün devam ettirildi. Yaşayan PEO zincir uçları metakriloil klorür (MAC) ile sonlandırıldı. Ayrıca, iki fonksiyonel gruba sahip olan makromonomerin serbest-radikal polimerizasyonu metakriloil, oksidatif polimerizasyonu ise tienil gruplarından gerçekleştirildi. Metakriloil ve tienil gruplarının varlığı, serbest-radikal ve oksidatif polimerizasyon yöntemleri, 1H-NMR analizi ve GPC ölçümleri yardımıyla aydınlatıldı.  Anahtar Kelimeler: Makromonomer, a, w-heterofonksiyonel polimerler, serbest-radikal polimerizasyon, oksidatif polimerizasyon.PEO macromonomers possessing thiophene moiety at one end and methacrylate group at the other end were prepared by a conventional high vacuum line technigue. A general method have been recently developed for synthesis of hetero-functional or hetero-telechelic PEO macromonomers by using a functional alcohol for initiating polymerization of EO followed by terminating with the other functionality. Using the same approach, a novel a,w-heterofunctional poly (ethylene oxide) macromonomer (PEO-makromonomer) possessing methacryloyl and thiophene end groups were prepared by ring-opening polymerization of ethylene oxide initiated by potassium thiophene ethoxide and termination of living ends of PEO with methacryloyl chloride. Polymerization was carried out at 40 0C over 3 nights. The obtained macromonomer has two polymerizable groups: the thiophene ring, with substitution at the 3-position, can be employed in oxidative polymerization while the vinyl group is useful for radical polymerization. The macromonomer, having an electroactive group, was polymerized oxidatively in the presence of FeCl3 as an oxidant. The macromonomer was also used in homopolymerization via vinylic terminus. The reaction involves the free radical polymerization of PEO in the presence AIBN as a thermal initiator. The evidence for successful free radical and oxidative polymerization processes was obtained by GPC measurements Incorparation of methacryloyl and thiophene groups were confirmed by 1H-NMR analysis, free radical and oxidative polymerization processes, respectively. Keywords: Macromonomer, a,w-heterofunctional polymers, free radical polymerization, oxidative polymerization