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Bomb Calorimetric Correlation Study between Chemical Structure and Enthalpy of Formation for a Linear Energetic Polyphosphazene

Bellamy A. J., Contini A. E., Golding P.

Central European Journal of Energetic Materials

2013

Vol. 10, no. 1

3--15

Energetic polyphosphazenes constitute a novel class of insensitive binders which potentially outperform conventional carbon-based systems in terms of their energy-densities and glass transition temperatures. To facilitate the calculation of energetic performance for these materials, we report here on the use of bomb calorimetry to determine the standard enthalpies of combustion (ΔcH°) and formation (ΔfH°) of 2,2,2-trifuoroethan-1-oxy-/2,3-dinitratopropan-1-oxy-polyphosphazene (I) as the proportion of (energetic) 2,3-dinitratopropan-1-oxy substituents (% Energetic Substitution, % ES) is varied between 31% and 78%. Similar data is presented for the parent polymer bis(2,2,2-trifuoroethan-1-oxy)-polyphosphazene (II) (% ES = 0). ΔcH° was found to vary between -2275 kJ·mol-11for the parent polymer II (% ES = 0) and -3415 kJ·mol-1 for I with % ES = 78. The corresponding values for ΔfH° were -3184 kJ·mol-1 and -1566 kJ·mol-1. These data indicate that, as expected, the polymer heats of formation become more favourable – with respect to the energetic performance of the polymer – as the percentage of energetic side chain functionalities (% ES) increases.

Palność wulkanizatorów cis-1,4-polibutadienu

Janowska G., Ślusarski L.

Polimery

2000

T. 45, nr 5

411-415

Przedstawiono wpływ antypirenów, takich jak tritlenek antymonu, chloroparafina, heksabromobenzen, cyjanuran melaminy, wodorotlenek glinu oraz polifosforan amonowo-melaminowy, na palność wulkanizatorów cis-1,4-polibutadienu usieciowanych wodorotlenkiem dikumylu, określaną metodami wskaźnika tlenowego i termowizji oraz jako czas spalania w powietrzu.

The flammability of dicmyl peroxide-crosslinked cis-1,4-polybutadiene vulcanizates was studied in relation of flame retardants like antimony trioxide, chloroparaffins, antimony trioxide-chloroparaffin blends, hexabromobenzene, melamine cyanurate, aluminum hydroxide and poly(ammonium-melamine phosphate) used as additives.