Molecules 2014, 19(1), 1353-1366; doi:10.3390/molecules19011353
Article

Molecular Dynamics of Neutral Polymer Bonding Agent (NPBA) as Revealed by Solid-State NMR Spectroscopy

1, 2,†,* email, 2, 1,* email, 1, 1 and 2,* email
Received: 12 October 2013; in revised form: 3 January 2014 / Accepted: 16 January 2014 / Published: 22 January 2014
(This article belongs to the Special Issue NMR of Proteins and Small Biomolecules)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: 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.
Keywords: bonding polymer; NPBA; structure; dynamics; solid-state NMR
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MDPI and ACS Style

Hu, W.; Su, Y.; Zhou, L.; Pang, A.; Cai, R.; Ma, X.; Li, S. Molecular Dynamics of Neutral Polymer Bonding Agent (NPBA) as Revealed by Solid-State NMR Spectroscopy. Molecules 2014, 19, 1353-1366.

AMA Style

Hu W, Su Y, Zhou L, Pang A, Cai R, Ma X, Li S. Molecular Dynamics of Neutral Polymer Bonding Agent (NPBA) as Revealed by Solid-State NMR Spectroscopy. Molecules. 2014; 19(1):1353-1366.

Chicago/Turabian Style

Hu, Wei; Su, Yongchao; Zhou, Lei; Pang, Aimin; Cai, Rulin; Ma, Xingang; Li, Shenhui. 2014. "Molecular Dynamics of Neutral Polymer Bonding Agent (NPBA) as Revealed by Solid-State NMR Spectroscopy." Molecules 19, no. 1: 1353-1366.

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