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Balancing processing ease with combustion performance in aluminum/PVDF energetic filaments

Published online by Cambridge University Press:  01 September 2020

Matthew C. Knott ,
Ashton W. Craig ,
Rahul Shankar ,
Sarah E. Morgan ,
Scott T. Iacono ,
Joseph E. Mates  and
Jena M. McCollum
Matthew C. Knott
Affiliation:
University of Colorado Colorado Springs, Department of Mechanical and Aerospace Engineering, Colorado Springs, Colorado80918, USA
Ashton W. Craig
Affiliation:
University of Colorado Colorado Springs, Department of Mechanical and Aerospace Engineering, Colorado Springs, Colorado80918, USA
Rahul Shankar
Affiliation:
University of Southern Mississippi, School of Polymer Science and Engineering, Hattiesburg, Mississippi39406, USA
Sarah E. Morgan
Affiliation:
University of Southern Mississippi, School of Polymer Science and Engineering, Hattiesburg, Mississippi39406, USA
Scott T. Iacono
Affiliation:
United States Air Force Academy, Department of Chemistry and Chemistry Research Center Colorado80840, USA
Joseph E. Mates
Affiliation:
Aerospace Systems Directorate, Air Force Research Laboratory, Edwards AFB California93524, USA
Jena M. McCollum*
Affiliation:
University of Colorado Colorado Springs, Department of Mechanical and Aerospace Engineering, Colorado Springs, Colorado80918, USA
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Molecular weight (Mw) effects in poly(vinylidene fluoride) (PVDF) influence both processability and combustion behavior in energetic Al–PVDF filaments. Results show decreased viscosity in unloaded and fuel-lean (i.e., 15 wt% Al) filaments. In highly loaded filaments (i.e., 30 wt% Al), reduced viscosity is minimal due to higher electrostatic interaction between Al particles and low Mw chains as confirmed by Fourier-transform infrared spectroscopy. Thermal and combustion analysis further corroborates this story as exothermic activity decreases in PVDF with smaller Mw chains. Differential scanning calorimetry and Thermogravimetric analysis show reduced reaction enthalpy and lower char yield in low Mw PVDF. Enthalpy reduction trends continued in nonequilibrium burn rate studies, which confirm that burn rate decreases in the presence of low Mw PVDF. Furthermore, powder X-ray patterns of post-burn products suggest that low Mw PVDF decomposition creates a diffusion barrier near the Al particle surface resulting in negligible AlF3 formation in fuel-rich filaments.

Keywords

energetic materialviscoelasticitysurface chemistry
Type
Invited Feature Paper
Information
Journal of Materials Research , First View , pp. 1 - 8
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Copyright
Copyright © Materials Research Society 2020

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Footnotes

b)

Contributing Editor: Sarah Morgan

References

Fleck, T.J., Murray, A.K., Gunduz, I.E., Son, S.F., Chiu, G.T.C., and Rhoads, J.F.: Additive manufacturing of multifunctional reactive materials. Addit. Manuf. 17, 176 (2017).Google Scholar
Bencomo, J.A., McCollum, J.M., and Iacono, S.T.: 3D printing multifunctional fluorinated nanocomposites: Tuning electroactivity, rheology and chemical reactivity. J. Mater. Chem. A 6, 12308 (2018).CrossRefGoogle Scholar
Zhou, X., Torabi, M., Lu, J., Shen, R., and Zhang, K.: Nanostructured energetic composites: Synthesis, ignition/combustion modeling, and applications. ACS Appl. Mater. Interfaces 6, 3058 (2014).CrossRefGoogle ScholarPubMed
Ruz-Nuglo, F.D. and Groven, L.J.: 3-D printing and development of fluoropolymer based reactive inks. Adv. Eng. Mater. 20, 1 (2018).CrossRefGoogle Scholar
Wang, H., Rehwoldt, M., Kline, D.J., Wu, T., Wang, P., and Zachariah, M.R.: Comparison study of the ignition and combustion characteristics of directly-written Al/PVDF, Al/Viton and Al/THV composites. Combust. Flame 201, 181 (2019).CrossRefGoogle Scholar
Li, L., Lin, Q., Tang, M., Duncan, A.J.E., and Ke, C.: Advanced polymer designs for direct-ink-write 3D printing. Chemistry 25, 10768 (2019).CrossRefGoogle ScholarPubMed
McCollum, J., Morey, A.M., and Iacono, S.T.: Morphological and combustion study of interface effects in aluminized poly(vinylidene fluoride) composites. Mater. Des. 134, 64–70 (2017).CrossRefGoogle Scholar
Huang, C., Jian, G., DeLisio, J.B., Wang, H., and Zachariah, M.R.: Electrospray deposition of energetic polymer nanocomposites with high mass particle loadings: A prelude to 3D printing of rocket motors. Adv. Eng. Mater. 17, 95 (2014).CrossRefGoogle Scholar
Xu, Z-X., Zhang, C-X., He, Z-X., and Wang, Q.: Pyrolysis characteristic and kinetics of polyvinylidene fluoride with and without pine sawdust. J. Anal. Appl. Pyrolysis 123, 402 (2017).CrossRefGoogle Scholar
Delisio, J. B., Huang, C., Jian, G., Zachariah, M. R., and Young, G.: Ignition and reaction analysis of high loading nano- Al/fluoropolymer energetic composite films. In American Institute of Aeronautics and Astronautics, National Harbor, Maryland (2014); pp. 1–8. https://doi.org/10.2514/6.2014-0646CrossRefGoogle Scholar
Suaste-Gómez, E., Rodríguez-Roldán, G., Reyes-Cruz, H., and Terán-Jiménez, O.: Developing an ear prosthesis fabricated in polyvinylidene fluoride by a 3D printer with sensory intrinsic properties of pressure and temperature. Sensors 16, 1 (2016).CrossRefGoogle ScholarPubMed
Kim, H., Torres, F., Wu, Y., Villagran, D., Lin, Y., and Tseng, T-L.: Integrated 3D printing and corona poling process of PVDF piezoelectric films for pressure sensor application. Smart Mater. Struct. 26, 085027 (2017).CrossRefGoogle Scholar
Arranz-Andrés, J., Pulido-González, N., Fonseca, C., Pérez, E., and Cerrada, M.L.: Lightweight nanocomposites based on poly(vinylidene fluoride) and Al nanoparticles: Structural, thermal and mechanical characterization and EMI shielding capability. Mater. Chem. Phys. 142, 469 (2013).CrossRefGoogle Scholar
Fu, K., Yao, Y., Dai, J., and Hu, L.: Progress in 3D printing of carbon materials for energy-related applications. Adv. Mater. 29, 1603486 (2017).CrossRefGoogle ScholarPubMed
Okabe, Y., Murakami, H., Osaka, N., Saito, H., and Inoue, T.: Morphology development and exclusion of noncrystalline polymer during crystallization in PVDF/PMMA blends. Polymer 51, 1494 (2010).CrossRefGoogle Scholar
Gebrekrstos, A., Sharma, M., Madras, G., and Bose, S.: New physical insights into shear history dependent polymorphism in poly(vinylidene fluoride). Cryst. Growth Des. 16, 2937 (2016).CrossRefGoogle Scholar
Bormashenko, Y., Pogreb, R., Stanevsky, O., and Bormashenko, E.: Vibrational spectrum of PVDF and its interpretation. Polym. Test. 23, 791 (2004).CrossRefGoogle Scholar
Elashmawi, I.S. and Hakeem, N.A.: Effect of PMMA addition on characterization and morphology of PVDF. Polym. Eng. Sci. 48, 895 (2008).CrossRefGoogle Scholar
Lee, M., Koo, T., Lee, S., Min, B.H., and Kim, J.H.: Morphology and physical properties of nanocomposites based on poly(methyl methacrylate)/poly(vinylidene fluoride) blends and multiwalled carbon nanotubes. Polym. Compos. 36, 1195 (2015).CrossRefGoogle Scholar
Wang, L. and Chen, S.: Crystallization behaviors of poly(vinylidene fluoride) and poly(methyl methacrylate)-block-poly(2-vinyl pyridine) block copolymer blends. J. Therm. Anal. Calorim. 125, 215 (2016).CrossRefGoogle Scholar
Zhou, W., Zuo, J., and Ren, W.: Thermal conductivity and dielectric properties of Al/PVDF composites. Compos. A Appl. Sci. Manuf. 43, 658 (2012).CrossRefGoogle Scholar
Strutton, J.W., Knott, M.C., Bencomo, J.A., Iacono, S.T., Mates, J.E., Alston, J.R., and McCollum, J.M.: Particle size effects in manipulating polymer decomposition to alter burn performance in aluminum/PVDF filaments. Polym. Int. (2020). In Review.Google Scholar
Rosenberg, P.E.: Stability relations of aluminum hydroxy-fluoride hydrate, a ralstonite-like mineral, in the system AlF3–Al2O3–H2O–HF. Can. Mineral. 44, 125 (2006).CrossRefGoogle Scholar
Geller, R.F. and Yavorsky, P.J.: Melting point of alpha-alumina. J. Res. Natl. Bur. Stand. 34, 395 (1945).CrossRefGoogle Scholar
Qiu, C. and Metselaar, R.: Solubility of carbon in liquid Al and stability of Al4C3. J. Alloys Compd. 216, 55 (1994).CrossRefGoogle Scholar