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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
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A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
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Deuterated polymers for probing phase separation using infrared microspectroscopy.

Robert A Russell1, Tamim A Darwish, Ljiljana Puskar

  • 1National Deuteration Facility, Australian Nuclear Science & Technology Organisation , Lucas Heights, NSW Australia.

Biomacromolecules
|December 25, 2013
PubMed
Summary
This summary is machine-generated.

Biodeuteration of polymers, like poly(3-hydroxyoctanoate) (PHO), effectively separates infrared (IR) spectra from protonated polymers, enabling clear visualization of phase separation in polymer blends.

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Area of Science:

  • Polymer Science
  • Spectroscopy
  • Materials Science

Background:

  • Infrared (IR) microspectroscopy is valuable for analyzing polymer blends.
  • Overlapping IR spectra hinder differentiation of similar polymers.
  • Phase separation in polymer blends is crucial for material properties.

Purpose of the Study:

  • To assess deuteration as a method to resolve overlapping IR peaks.
  • To enhance phase contrast in polymer blends using IR microspectroscopy.
  • To investigate the phase behavior of poly(3-hydroxybutyrate)/poly(3-hydroxyoctanoate) (PHB/PHO) blends.

Main Methods:

  • Microbial biosynthesis of deuterated poly(3-hydroxyoctanoate) (d-PHO).
  • Infrared (IR) microspectroscopy for spectral analysis.
  • Preparation of protonated poly(3-hydroxybutyrate)/deuterated poly(3-hydroxyoctanoate) (PHB/d-PHO) blends.

Main Results:

  • Deuterated PHO (d-PHO) exhibited distinct C-D stretching vibrations, separated from PHB's C-H signals.
  • Phase separation was observed in 50:50 (% w/w) PHB/d-PHO blends with domains up to 100 μm.
  • Miscibility at smaller scales was indicated, increasing with higher PHB content.

Conclusions:

  • Biodeuteration combined with IR microspectroscopy effectively maps phase behavior in polymer blends.
  • This technique overcomes limitations of overlapping spectra in IR analysis.
  • Deuteration provides a valuable tool for understanding polymer blend morphology.