Chemistry

Polyfluorene

Polyfluorene


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Polyfluorenes are polymers with good semiconductor properties. You belong to the Poly (p-phenylenes and are used in organic light-emitting diodes (OLEDs). When a DC voltage of 3-5 volts is applied, they emit polarized light in the blue area.

See also: Organic Light Emitting Diode

Learning units in which the term is dealt with

Polyacetylene - an example of conductive polymers40 min.

ChemistryMacromolecular ChemistryPolymers

The principle of conductive polymers is explained using the example of polyacetylene. Shirakawa, MacDiarmid and Heeger received the Nobel Prize in Chemistry in 2000 for their work on this topic. Since polyacetylene is not very stable in air, other conductive polymers with better properties were sought. Some of them are presented.

Electrically conductive polymers40 min.

ChemistryMacromolecular ChemistryFunctional polymers

After an introduction to the principles of the conductivity of polymers, some examples and their areas of application are presented.


Polyethine

Polyethine (even Polyacetylene, Abbreviations PAC) is a polymer of ethyne. There are three polyethine isomers, the trans-polyethine, the cis-polyethine and the cis-cisoidal polyethine, which however is unstable. Polyethine is an electrical insulator by doping you can achieve a conductivity that equals that of silver, the metal with the best electrical conductivity. Polyethine was the first polymer on which electrical conductivity was observed.

Doped (conductive) polyethine reacts with oxygen in air and thereby loses its conductivity. Because of this air instability, it is of little importance nowadays; it was replaced by semiconductor polymers such as polypyrrole, polyaniline, polyphenylenevinylene, polyfluorene and polythiophene, which were discovered later.