By Lucas Zhang | 27 April 2023 | 0 Comments

Catch up on the latest Polyaryls industry news from UCHEM

Polyphenylenes (PP) are ð-conjugated polymers drawinga considerable interest from the mid-1960s asthermally stable materials.Nowadays, polyphenylenesare again in the focus of attention because of theirunusual electrical and optical properties such as electricalconductivity, optical nonlinearity, luminescence, and therefore the possibility of using in organic lightemitting diodes (OLEDs).Wide band gaps allowingemission of blue light (400-450 nm) are typical forpolyphenylenes. The development of effective long-livedblue emitters remains a significant challenge in the fieldof OLEDs that makes polyphenylenes the polymers ofinterest. PP can be synthesized using differentavenues.The majority of recent works were focusedon linear PP.One of the successful methods tosynthesize linear PP is Ni0-catalyzed homopolymerizationof aromatic dibromides or dichlorides. Thismethod leads to defect-free structures and seems to bepromising for synthesis of polyphenylenes designed foroptoelectronic devices.
The modern demands for OLEDs require a veryrobust synthetic procedure to obtain highly emissive PPwith high yields. Since these PP should be both solublein organic solvents and defect-free to provide highemission, we suggest here a combination of two techniques:(i) cyclocondensation of monoacetyl aromaticcompounds with trimer formation (a central part of astarlike polymer) and (ii) Ni0-catalyzed dehalogenationfor synthesis of branched defect-free polymers. 
UCHEM has been manufacturing the following core structure of PP with cyclocondensation of monoacetyl aromatic compounds.
  Most of the above are available from warehouse under 5kgs. UCHEM could provide service of contract manufacture with the robust process. Please contact with UCHEM if you are interested in the chemicals.

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