Synthèse du polymère dérive de carbazole

Abstract

This study focuses on the synthesis and characterization of poly(N-vinylcarbazole) (PVK), a polymer derived from carbazole with promising optoelectronic properties for organic devices. The synthesis was carried out by free radical polymerization in solution using AIBN as the initiator, at 80 °C for 2 hours, with a yield of approximately 73.6%. FTIR analysis confirmed the polymerization of NVK by the disappearance of the characteristic bands of the vinyl double bond (1855 cm⁻¹ and 1920 cm⁻¹), replaced by the appearance of new bands corresponding to aliphatic C–H bonds in PVK, notably at 3058 cm⁻¹ (aromatic C–H), 2997 cm⁻¹ and 2930 cm⁻¹ (aliphatic C–H), as well as 1224 cm⁻¹ (C–N). These results confirm the formation of the polymer. The UV-Visible spectrum of PVK showed absorption bands at 305 nm and 323 nm, indicating an extension of π-conjugation and a significant bathochromic shift compared to the monomer. The optical band gap (Eg) of PVK was estimated to be 3.59 eV, confirming its semiconducting nature.Thermal analysis by DSC revealed a glass transition temperature around 220 °C and thermal stability up to 250 °C. SEM imaging showed a homogeneous and dense morphology, confirming good microstructural organization of the polymer. All these results confirm the successful synthesis and highlight the promising properties of PVK for optoélectronic applications such as OLEDs, photovoltaic cells, or memory devices.