Scott T. Iacono

United States Air Force Academy

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Andrew J. Peloquin

United States Air Force Academy

116

Colin D. McMillen

Clemson University

Gary J. Balaich

United States Air Force Academy

William T. Pennington

Clemson University

Abby R. Jennings

United States Air Force Academy

Joseph M. Mabry

Edwards Air Force Base

Dennis W. Smith

Mississippi State University

Daniel A. Kure

United States Air Force Academy

Cynthia A. Corley

United States Air Force Academy

Stephen M. Budy

United States Air Force Academy

Cooperative Institutions

United States Air Force Academy

Clemson University

Edwards Air Force Base

The University of Texas at Dallas

United States Air Force Research Laboratory

University of Southern Mississippi

Wright-Patterson Air Force Base

Colorado Springs School District 11

The University of Texas at Austin

Los Alamos National Laboratory

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Manipulating polymer decomposition to alter burn performance in aluminium/ poly(vinylidene fluoride) filaments

Polymer International (2020)

Jared W. Strutton Matthew C. Knott José A. Bencomo Scott T. Iacono Joseph E. Mates

Abstract Filaments composed of aluminium powder and poly(vinylidene fluoride) (PVDF) were produced by melt‐processing to investigate the effect of particle size and loading on decomposition behavior and burn performance. Thermal analysis revealed that nanoscale Al samples decompose PVDF in one step through interactions with the Al particle surface. Microscale samples presented with two distinct decomposition steps: (1) accelerated decomposition through interactions with the Al particle surface and (2) pyrolysis. This behavior occurs due to the drastic change in Al specific surface area. The burn test revealed that the filaments experience a maximum flame speed near the stoichiometric concentration for each fuel size. Although there are variations in decomposition and burn behavior between particle sizes, burn product analysis shows that all melt‐processed filaments result exclusively in AlF 3 formation in open‐air burns. This behavior is unique to melt‐processed energetic composites and may provide more insight to binder–particle interactions and the effect on burn properties in energetic composites. © 2020 Society of Chemical Industry

Microscale chemistry

Particle (ecology)

10.1002/pi.6129

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Citations (10)

Fabrication, Characterization, and Energetic Properties of Metallized Fibers

ACS Applied Materials & Interfaces (2013)

Nicholas A. Clayton Keerti Kappagantula Michelle L. Pantoya Sharon C. Kettwich Scott T. Iacono

Polystyrene fibers loaded with an energetic blend of nanoaluminum (n-Al) and perfluoropolyether (PFPE) were successfully fabricated via electrospinning producing nanothermite fabrics. Fibers were generated with loadings up to 17 wt % n-Al/PFPE incorporated into the fiber. Microscopy analysis by SEM and TEM confirm a uniform dispersion of PFPE treated n-Al on the outside and inside of the fibers. Metallized fibers were thermally active upon immediate ignition from a controlled flame source. Thermal analysis by differential scanning calorimetry (DSC) found no change in glass transition temperature when comparing pure polystyrene fibers with fibers loaded up to 17 wt % n-Al/PFPE. Thermal gravimetric analysis (TGA) revealed a shift in decomposition temperatures to lower onsets upon increased loadings of n-Al/PFPE blends, consistent with previous studies. Flame propagation studies confirmed that the metallized fibers are pryolants. These metallized fibers are a recent development in metastable intermolecular composites (MICs) and details of their synthesis, characterization, and thermal properties are presented.

Polystyrene

Thermogravimetric analysis

Electrospinning

Synthetic fiber

10.1021/am404583h

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Citations (38)

Preparation and Thermal Analysis of Blended Nanoaluminum/Fluorinated Polyether-Segmented Urethane Composites

Journal of Composites Science (2019)

Chance M. Baxter Jena McCollum Scott T. Iacono

The thermally induced reaction of aluminum fuel and a fluoropolymer oxidizer such as polytetrafluoroethylene (via C-F activation) has been a well-studied thermite event for slow-burning pyrolants among a multitude of energetic applications. Generally, most metallized thermoplastic fluoropolymers suffer from manufacturing limitations using common melt or solvent processing techniques due to the inherent low surface energy and high crystallinity of fluoropolymers. In this report, we prepared an energetic composite utilizing the versatility of urethane-based polymers and provide a comparative thermal characterization study. Specifically, a thermite formulation comprising of nanometer-sized aluminum (nAl) fuel coated with perfluoropolyether (PFPE) oxidizer was solvent-blended with either a polyethylene glycol (PEG) or PFPE-segmented urethane copolymer. Thermal data were collected with calorimetric and thermogravimetric techniques to determine glass transition temperature and decomposition temperature, which showed modest effects upon various loadings of PFPE-coated nAl in the urethane matrix. While our application focus was for energetics, this study also demonstrates the potential to expand the ability to broadly manufacture structural metallized composites to their consideration as coatings, foams, or fibers.

Thermite

Fluoropolymer

Thermogravimetric analysis

Compounding

10.3390/jcs3010025

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Citations (8)

Synthesis of fluorinated silica nanoparticles containing latent reactive groups for post-synthetic modification and for tunable surface energy

Nanoscale (2016)

Abby R. Jennings Stephen M. Budy Carl J. Thrasher Scott T. Iacono

A new PFCP-based chlorosilane monomer containing a latent reactive fluorine atom was synthesized utilizing a hydrosilylation reaction. This monomer was used to functionalize Stöber silica nanoparticles, or network silicas, and the ability to tailor the properties of the functionalized nanoparticles was investigated by reacting the latent reactive fluorinated alkene with various nucleophiles. In order to model the chemical transformations occuring with the PFCP-functionalized particles, a new PFCP-containing molecular silica was prepared using a hydrosilylation reaction. The molecular silica was designed such that it contained a latent reactive fluorine atom and could also undergo post-synthetic modifications with various nucleophiles. The ability to modify the latent reactive group and tune the properties of the molecular and network silicas was verified by multi-nuclear NMR ((1)H, (13)C, (19)F, and (29)Si), thermal characterizations, and by investigating the hydrophobicity and surface morphology of spin-cast films prepared from the molecular and network silicas.

Hydrosilylation

Chlorosilane

Alkene

Surface Modification

Fluorine

10.1039/c6nr04829c

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Citations (8)

Selective Oxidation of Zirconocyclopentenes via Organoboranes.

ChemInform (2004)

Jeffrey S. T. Gorman Scott T. Iacono Brian L. Pagenkopf

Abstract For Abstract see ChemInform Abstract in Full Text.

10.1002/chin.200423086

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Citations (0)

CCDC 1908154: Experimental Crystal Structure Determination

The Cambridge Structural Database (2020)

Andrew J. Peloquin Scott T. Iacono

10.5517/ccdc.csd.cc221lc3

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CCDC 1937619: Experimental Crystal Structure Determination

The Cambridge Structural Database (2019)

Andrew J. Peloquin Cynthia A. Corley Sonya K. Adas Gary J. Balaich Scott T. Iacono

10.5517/ccdc.csd.cc2317v8

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Citations (0)

CCDC 1564599: Experimental Crystal Structure Determination

The Cambridge Structural Database (2017)

Andrew J. Peloquin Martin B. Smith Gary J. Balaich Scott T. Iacono

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/ccdc.csd.cc1pj2y7

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CCDC 1916090: Experimental Crystal Structure Determination

The Cambridge Structural Database (2019)

Andrew J. Peloquin Sonya K. Adas Scott T. Iacono Gary J. Balaich

10.5517/ccdc.csd.cc229vcm

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CCDC 2058237: Experimental Crystal Structure Determination

The Cambridge Structural Database (2021)

Andrew J. Peloquin Colin D. McMillen Scott T. Iacono William T. Pennington

10.5517/ccdc.csd.cc272rrv

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Citations (0)