Author : Demet Göen Çolak
Publisher :
ISBN 13 :
Total Pages : 156 pages
Book Rating : 4.:/5 (85 download)
Book Synopsis Synthesis and Characterization of Reactive Intermediates Macromolecules by Controlled Polymerization and Coupling Processes by : Demet Göen Çolak
Download or read book Synthesis and Characterization of Reactive Intermediates Macromolecules by Controlled Polymerization and Coupling Processes written by Demet Göen Çolak and published by . This book was released on 2010 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study describes the synthesis and characterization of mid- and end-chain functional telechelics, macromonomers and their use in preparing soluble and processable comb-like conjugated polymers, such as poly(phenylene vinylene)s (PPVs). Well-defined polystyrene (PSt) or poly(-caprolactone) (PCL) based polymers containing mid- or end-chain dibromobenzene moieties were prepared by controlled polymerization methods, such as atom transfer radical polymerization (ATRP) or ring opening polymerization (ROP). The reaction of these polymers with amino- or aldehyde- functionalized monoboronic acids, in Suzuki type couplings, yielded the corresponding desired telechelics. Further functionalization was achieved by condensation reactions of these polymers with appropriate low molecular weight aldehydes or amines to form azomethine linkages. As a result, mid- or end-chain amino-, aldehyde-, pyrrolyl-, naphthyl- or hydroxy-functional telechelics were obtained. These telechelics may serve as useful macromonomers in the preparation of various macromolecular structures displaying distinct characteristics. PPV derivatives bearing well-defined PCL or PSt as lateral susbstituents were synthesized by following a Wittig polycondensation using dialdehyde functional telechelic macromonomers in combination with bis(triphenylphosphonium) salts in the presence of potassium tert- butoxide. The resulting colored PPVs are soluble in common organic solvents at room temperature just as the starting macromonomers. They emit blue and exhibit very high relative and absolute photoluminescence quantum yield. Thus, excellent solubility combined with the optical properties favours the use of these materials in the design of highly efficient light emitting-diodes (LEDs) and in many applications in various areas.