Abstract
Controlled radical polymerization of N-vinylcarbazole (NVK) via microwave-assisted reversible addition-fragmentation chain transfer (RAFT) polymerization is described. As chain transfer agent, 1,3,5-benzyl tri (diethyldithiocarbamate), was used. The chain transfer agent, containing a 1.3.5-trisubstituted benzene ring as core and three dithiocarbamate functionalities attached through an intermediate for fragmenting covalent bonds, led to poly(N-vinylcarbazole) (PVK) with star architecture. Polymerizations were carried out in 1,4-dioxane as solvent, at 70 °C, and studied for different polymerization times and monomer/CTA/initiator ratios. The SEC molecular weight curves exhibit a trimodal distribution, assigned to the linear and star-star coupling polymers, accompanying the real star polymer (as main product).
Highlights
Carbazole-based polymers are materials of considerable scientific and industrial interest due to their attractive features, such as hole-transporting, high charge-carrier mobility, and electroluminescent properties [1,2]
All previous studies on the charge transfer complexes (CTC) of PVK and their photoconducting properties were carried out using a linear polymer obtained by classical techniques
We report the controlled synthesis of three-arm poly(NVK) star by reversible addition-fragmentation chain transfer (RAFT) polymerization using a three-functional dithiocarbamate as chain transfer agent, with a single-mode microwave reactor
Summary
Carbazole-based polymers are materials of considerable scientific and industrial interest due to their attractive features, such as hole-transporting, high charge-carrier mobility, and electroluminescent properties [1,2]. All previous studies on the charge transfer complexes (CTC) of PVK and their photoconducting properties were carried out using a linear polymer obtained by classical techniques. Controlled/“living” radical polymerization (CRP) techniques have attracted significant attention in the past two decades These methods allow moderate to good control over the polymer chain growth processes and synthesis of telechelic polymers and block copolymers became relatively easy using these techniques. Such polymers can be reactivated for a chain extension reaction with the same or different monomers because they possess active end groups. We report the controlled synthesis of three-arm poly(NVK) star by RAFT polymerization using a three-functional dithiocarbamate as chain transfer agent, with a single-mode microwave reactor. We selected the R-group approach using a three-functionalized dithiocarbamate, in which the stabilizing groups are linked to the core via a fragmenting covalent bond
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