0000000000347190
AUTHOR
Gerd C. Hochberg
Polymersynthesen durch repetitive N-alkylierungen
The repetitive N-alkylation reaction, at first used by Marvel, turned out to be a very versatile method for the synthesis of polycations. Rembaum introduced the name ionenes for this type of polymers. In the first part of the lecture some examples of single-stranded ionenes are described. The second part shows how the repetitive N-alkylation can be used for the synthesis of spiro polymers. In these double-stranded polymers two spiro-conjugated rings of the main chain have a central quaternary nitrogen in common (spiro-ionenes or spiro-azonia polymers)
Synthesis and properties of aromatic ionenes
Cationic polyelectrolytes with aromatic segments can be synthesized by a repetitive alkylation reaction. The structure of the products, their synthesis and their solubility are described. All ionenes are not, or only in small amounts, water soluble. The best solubility can be achieved by mixtures of polar protic and aprotic solvents. Variations of the counterion produces sufficient solubility in THF. All ionenes show a typical polyelectrolyte effect. The thermal stability of aromatic ionenes and the glass transition temperature is dominated by the nature of the counterion. The molecular weight of oligomers can be described by using a combination of a conductive titration method and an ion s…
Electrically conductive TCNQ complexes of aromatic ionenes
New types of complex salts of 7,7',8,8'-tetracyanoquinodimethane with aromatic ionenes and their model compounds were prepared. The electrical conductivity and the activation energy were measured and discussed in relation to their structure. The effects of the nature of the aromatic unit, and the flexibility and rigidity of the polymer backbone were compared with the corresponding model compounds. The effects of frequency and temperature are discussed in terms of the molecular structure of the complex. The electroconductivity at room temperature of the 1 :1 polymer complex salts was found to be between 2 x 10 -4 and 7 x 10 -5 S/cm, while that of the model complex salts was between 1.3 x 10 …