Preparation of high‐molecular‐weight poly(N‐vinylcarbazole) by the photoinduced low‐temperature solution polymerization of N‐vinylcarbazole in 1,1,2,2‐tetrachloroethane

Abstract

ABSTRACT:For the preparation of high-molecularweight (HMW) poly(N-vinylcarbazole) (PVCZ) with a narrow molecular weight distribution, N-vinylcarbazole (VCZ) was solution-polymerized in 1,1,2,2-tetrachloroethane (TCE) at Ϫ20, 0, and 20°C with photoinitiation. The effects of the polymerization temperature and the concentrations of the polymerization solvent and photoinitiator on the polymerization behavior and molecular parameters of PVCZ were investigated. A low polymerization temperature with photoirradiation was successful in obtaining HMW PVCZ with a smaller temperature rise during polymerization than that for thermal free-radical polymerization by azobisisobutyronitrile (AIBN). The photo-solution-polymerization rate of VCZ in TCE was proportional to [AIBN] 0.45 . The molecular weight was higher and the molecular weight distribution was narrower for PVCZ made at lower temperatures. For PVCZ prepared in TCE at Ϫ20°C with a photoinitiator concentration of 0.00003 mol/mol of VCZ, a weight-average molecular weight of 920,000 was obtained, with a polydispersity index of 1.46, and the degree of transparency converged to about 99%.

Preparation of new dinuclear half-titanocene complexes with ortho- and meta-xylene linkages and investigation of styrene polymerization

“…Investigation of the properties of dinuclear metallocenes has been a topic of this lab's research since these metallocenes may offer cooperative effects between two active sites that could provide an effective tool for the discovery of a new class of catalysts for olefin polymerization [10,11]. In fact, the dinuclear metallocene systems display not only the defining characteristics of well-defined mononuclear metallocenes, but also a strong dependence upon the nature of the bridging ligand [12][13][14][15][16][17][18].…”

Effect of Solvent on the Morphology of High Molecular Weight Poly(N-vinyl carbazole) Web Prepared by Electrospinning

“…Poly(N-vinyl carbazole) (PVCz) having photoconductivity is one of the promising materials for good photoconductors, charge-transfer complexes, electroluminescent devices, and photo-refractive materials 18 . Photoconductivity in polymeric materials is usually dependent on both electric field and wavelength.…”