Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

NMR Methodologies for the Detection and Quantification of Nanostructural Defects in Silicone Networks

Journal Article · · Macromolecules
 [1];  [1];  [1];  [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
+ Show Author Affiliations
Here, we present and discuss a sensitive spectroscopic means of detecting and quantifying network defects within a series of polysiloxane elastomers through a novel application of 19F solution state nuclear magnetic resonance (NMR). Polysiloxanes are the most utilized non-carbon polymeric material today. Their final network structure is complex, hierarchical, and often ill-defined due to modification. Characterization of these materials with respect to starting and age-dependent network structure is obfuscated by the intractable nature of polysiloxane network elastomers. We report a synthetic strategy for selectively tagging chain-end silanols with an organofluorine compound, which may then be conveniently and quantitatively measured as a function of structure and environment by means of 19F NMR. This study represents a new and sensitive means of directly quantifying aspects of network architecture in polysiloxane materials and has the potential to be a powerful new tool for the spectroscopic assessment of structural dynamic response in polysiloxane networks.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1460072
Report Number(s):
LLNL-JRNL--737499; 890349
Journal Information:
Macromolecules, Journal Name: Macromolecules Journal Issue: 5 Vol. 51; ISSN 0024-9297
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

Figures / Tables (12)

Figure 1(p. 9)figure Figure 1
Figure 2(p. 10)figure Figure 2
Figure 3(p. 11)figure Figure 3
Table 1(p. 12)table Table 1
Figure 4(p. 13)figure Figure 4
Scheme 1(p. 15)figure Scheme 1
Figure 5(p. 16)figure Figure 5
Table 2(p. 18)table Table 2
Figure 6(p. 19)figure Figure 6
Figure 7(p. 20)figure Figure 7
SI1(p. 23)figure SI1
SI2(p. 24)figure SI2

Similar Records

Nonideality in Silicone Network Formation via Solvent Swelling and 1H Double-Quantum NMR
Journal Article · Thu Dec 27 23:00:00 EST 2018 · Macromolecules · OSTI ID:1512609
Spectroscopic Signatures of MQ-Resins in Silicone Elastomers
Journal Article · Fri Apr 23 00:00:00 EDT 2021 · Macromolecules · OSTI ID:1785911

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY