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Title: Investigating Chain Dynamics in Highly Crosslinked Polymers using Solid–State 1H NMR Spectroscopy

Journal Article · · Journal of Polymer Science. Part B, Polymer Physics
DOI: https://doi.org/10.1002/polb.24869 · OSTI ID:1559498
ORCiD logo [1]; ORCiD logo [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
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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. Here, 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.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1559498
Report Number(s):
SAND-2019-8648J; 677894
Journal Information:
Journal of Polymer Science. Part B, Polymer Physics, Vol. 57, Issue 17; ISSN 0887-6266
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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Figures / Tables (20)

FIGURE 1(p. 4)figure FIGURE 1
FIGURE 2(p. 7)figure FIGURE 2
Figure 3(p. 11)figure Figure 3
Table 1(p. 12)table Table 1
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Table 4(p. 25)table Table 4
FIGURE 11(p. 28)figure FIGURE 11
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FIGURE S4(p. 42)figure FIGURE S4
FIGURE S5(p. 43)figure FIGURE S5

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