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Investigating Chain Dynamics in Highly Crosslinked Polymers using Solid-State 1H NMR Spectroscopy

Journal of Polymer Science, Part B: Polymer Physics

Alam, Todd M.; Jones, Brad H.

Solid state 1H NMR line-shape analysis and (double quantum) DQ 1H NMR experiments have been used to investigate the segmental and polymer chain dynamics as a function of temperature for a series of thermosetting epoxy resins produced using different diamine curing agents. In these thermosets, chemical crosslinks introduce topological constraints leading to residual stresses during curing. Materials containing a unique ferrocene-based diamine (FcDA) curing agent were evaluated to address the role of the ferrocene fluxional process on the atomic-level polymer dynamics. At temperatures above the glass transition temperature (Tg), the DQ 1H NMR experiments provided a measure of the relative effective crosslink and entanglement densities for these materials and revealed significant polymer chain dynamic heterogeneity in the FcDA-cured thermosets. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019, 57, 1143–1156.

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