Molecular Dynamics of Neutral Polymer Bonding Agent (NPBA) as Revealed by Solid-State NMR Spectroscopy
Author(s)
Su, Yongchao; Pang, Aimin; Cai, Rulin; Ma, Xingang; Li, Shenhui; Hu, Wei, 1972-; Zhou, Lei,Ph.D.Massachusetts Institute of Technology.; ... Show more Show less
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Neutral polymer bonding agent (NPBA) is one of the most promising polymeric materials, widely used in nitrate ester plasticized polyether (NEPE) propellant as bonding agent. The structure and dynamics of NPBA under different conditions of temperatures and sample processing are comprehensively investigated by solid state NMR (SSNMR). The results indicate that both the main chain and side chain of NPBA are quite rigid below its glass transition temperature (Tg). In contrast, above the Tg, the main chain remains relatively immobilized, while the side chains become highly flexible, which presumably weakens the interaction between bonding agent and the binder or oxidant fillers and in turn destabilizes the high modulus layer formed around the oxidant fillers. In addition, no obvious variation is found for the microstructure of NPBA upon aging treatment or soaking with acetone. These experimental results provide useful insights for understanding the structural properties of NPBA and its interaction with other constituents of solid composite propellants under different processing and working conditions.
Date issued
2014-01Department
Massachusetts Institute of Technology. Department of Chemistry; Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology)Journal
Molecules
Publisher
MDPI AG
Citation
Hu, Wei, Yongchao Su, Lei Zhou, Aimin Pang, Rulin Cai, Xingang Ma, and Shenhui Li. “Molecular Dynamics of Neutral Polymer Bonding Agent (NPBA) as Revealed by Solid-State NMR Spectroscopy.” Molecules 19, no. 1 (January 22, 2014): 1353–1366.
Version: Final published version
ISSN
1420-3049