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Investigating the Structural and Mechanical Properties of Boron Nitride Nanotubes and Their Polymer Nanocomposites

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State University of New York at Binghamton Binghamton United States

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This research project has focused on investigating the structural and mechanical properties of boron nitride nanotubes BNNTs in high temperature environments, and the mechanical properties of boron nitride nanotubes BNNTs reinforced polymer nanocomposites. Systematic and quantitative material characterization of BNNTs in high temperature environments demonstrated that BNNTs are capable of surviving up to 900 deg C in air and over 1300 deg C in inert gas and vacuum environments. The mechanical integrity of individual BNNTs is shown to remain intact at up to 900 deg C in air. The strengths of the interfaces formed by individual BNNTs with Polymethyl methacrylate PMMA and epoxy were characterized by using in situ electron microscopy single-nanotube pull-out techniques. BNNTs were found to form strong binding interfaces with polymers, which is in part attributed to the partially ionic nature of B-N bonds. This project also conducted exploratory studies on the reinforcing mechanisms of BNNTs in metal and ceramic nanocomposites. Particularly, substantial fracture toughness improvement for silica was demonstrated even with low concentrations of BNNTs. The research findings demonstrate that BNNTs are structurally and mechanically stable in high temperature environment

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Technical Report,30 Sep 2015,29 Sep 2018



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Approved For Public Release;

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