Azoalkanes: A novel class of flame retardants

Ronan C. Nicolas, Carl-Eric Wilen, Michael Roth, Rudolf Pfaendner, Roswell E., III King

Research output: Contribution to journalArticleScientificpeer-review

29 Citations (Scopus)


The synthesis of azoalkanes such as azocyclohexane (1) and 4,4′-bis(cyclohexylazocyclohexyl)methane (2) and their use as flame retardants in polymeric substrates is reported. For the first time it is demonstrated that azoalkanes alone can effectively provide flame retardancy and self-extinguishing properties to poly(propylene) films at a very low concentration of 0.25 to 0.5 wt.-%. All the poly(propylene) formulations passed DIN 4102-1/62 standards and the instant azoalkane-containing poly(propylene) blends show no discoloration.

Original languageEnglish
Pages (from-to)976-981
Number of pages6
JournalMacromolecular Rapid Communications
Issue number12
Publication statusPublished - 24 Jun 2006
MoE publication typeA1 Journal article-refereed


  • additives
  • azo compound
  • flame retardance
  • non-halogenated flame retardants
  • poly(propylene) (PP)


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