Investigation of Polymer Matrix Nano-Aluminum Composites with Pulsed Laser Heating by In-Situ TEM

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Authors
Isik, Tugba
Xu, Xiaohui
Son, Steven F.
Gunduz, I. Emre
Ortalan, Volkan
Subjects
Nanoenergetic composites
In situ TEM
Fluoropolymer
Laser Heating
Advisors
Date of Issue
2019
Date
2019
Publisher
Wiley
Language
en_US
Abstract
Nanocomposites of aluminum and fluoropolymers react rapidly due to highly exothermic aluminum fluorination because of the high specific surface area nanoscale particles. In-situ transmission electron microscopy (TEM) techniques are invaluable for real time monitoring of the reactions in these systems at the nanoscale. Here, we investigated the reactions in nanoscale Al (nAl) and THV (terpolymer of tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride) and nAl-LDPE (low density polyethylene) composites, heated using a pulsed laser in a TEM. Results show that reactions are initiated at about 720 K, when THV starts to decompose, and proceed with the formation and growth of a hollow aluminum fluoride (AlF3) shell. Diffraction patterns revealed that this phase is the rare η-phase AlF3. In contrast, no reactions were observed in the inert nAl-LDPE composites. The experimental and theoretical results reveal that rapid pulsed laser heating and subsequent cooling of a nanoscale sample influences the phases that can form, and can be utilized to investigate other systems.
Type
Article
Description
The article of record as published may be found at https://doi.org/10.1002/prep.201900134
Series/Report No
Department
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
This work was supported by the Young Investigator Program of Department of Defense Office of Naval Research (CBET-1437219)
Funder
This work was supported by the Young Investigator Program of Department of Defense Office of Naval Research (CBET-1437219)
Format
5 p.
Citation
Isik, Tugba, et al. "Investigation of Polymer Matrix Nano‐Aluminum Composites with Pulsed Laser Heating by In‐Situ TEM." Propellants, Explosives, Pyrotechnics 44.12 (2019): 1608-1612
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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