Fluorinated Polyphosphazenes for Insensitive Pyrotechnics

  • Author: ChemistryViews.org
  • Published: 22 August 2014
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
  • Source / Publisher: Propellants Explosives Pyrotechnics/Wiley-VCH
thumbnail image: Fluorinated Polyphosphazenes for Insensitive Pyrotechnics

Energetic polyphosphazenes constitute a class of high energy low sensitivity materials that are extremely versatile and which are currently considered as fillers for all kinds of munitions to make them insensitive. Insensitive Munitions (IM) typically react less fierce when accidentally exposed to fire, bullet impact or shaped charge jet impact. That is they do not detonate upon the above stimuli, but deflagrate or merely burn as is described in the NATO publication STANAG 4439.


Ernst-Christian Koch and Alessandro E. Contini, Centre for Defence Chemistry, Shrivenham, UK, have identified the non-energetic poly[bis(2,2,2-trifluoroethoxy)phosphazene] (PTFEP) (–N=P(OCH2CF3)2–), as an alternative oxidizer to both polytetrafluoroethylene (PTFE) (aka: Teflon®) and hexafluoropropene-vinylidene fluoride-copolymer (aka: Viton® A) in magnesium based pyrotechnics (MTV flares). These MTV pyrotechnics typically are used in vital infrared countermeasure flares for self-protecion of aerial platforms against infrared guided missiles and are used as high performance igniters for low vulnerability (LOVA) propellants.


Both theoretical calculations and experimental works showed that PTFEP is an ideal replacement of both Teflon® and Viton® A in MTV as it combines both the oxidational power and the binding efficiency. Moreover, PTFEP is a superior oxidizer in that it enhances the combustion plume over standard fluorocarbons through liberation of hydrogen and nitrogen gas. Preliminary testing indicates lower mechanical and thermal sensitivity of corresponding formulations compared to standard MTV payloads making these materials prospective insensitive flare and igniter materials for insensitive pyrotechnics to protect and serve tomorrow’s warfighters.


Article Views: 2975

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more


CONNECT:

ChemistryViews.org on Facebook

ChemistryViews.org on Twitter ChemistryViews.org on YouTube ChemistryViews.org on LinkedIn Sign up for our free newsletter


A product of ChemPubSoc Europe (16 European Chemical Societies)and Wiley-VCH