Accession Number:

ADA622818

Title:

Synthesis and Reactivity of Aluminized Fluorinated Acrylic (AIFA) Nanocomposites (Postprint)

Descriptive Note:

Journal article

Corporate Author:

AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE

Report Date:

2012-06-18

Pagination or Media Count:

12.0

Abstract:

Fluorinated materials, such as polytetrafluoroethylene and its co-polymers, have attracted significant interest throughout the energetic materials community due to their strong reactivity with aluminum powders. Herein, we report the synthesis of a novel composite material produced through the in situ polymerization of 1H,1H,2H,2H-perfluorodecyl methacrylate in the presence of aluminum nanoparticles which have been previously functionalized with phosphoric acid 2-hydroxyethyl methacrylate ester to promote chemical integration into the polymer matrix. These materials, which we have termed aluminized fluorinated acrylic AlFA composites, have been prepared with particle contents ranging from 10 to 70 by weight. At particle loadings of 60 wt. or less, the AlFA composites exhibited thermoplastic behavior and were able to be processed by melt extrusion. The AlFA-50 composite demonstrated the highest reactivity most intense flame and shortest time to achieve complete deflagration during air combustion experiments performed on consolidated pellets. Chemical analysis of the char indicated the presence of AlF3, in addition to Al2O3, Al4C3 and residual Al, indicating that reaction with the fluoropolymer matrix does result in fluorination of the aluminum during the deflagration, however, this mechanism competes kinetically with air oxidation and carbide formation at higher particle loadings.

Subject Categories:

  • Physical Chemistry
  • Polymer Chemistry
  • Laminates and Composite Materials
  • Metallurgy and Metallography
  • Plastics
  • Combustion and Ignition

Distribution Statement:

APPROVED FOR PUBLIC RELEASE