Solids-NMR Apparatus for Materials Characterization
Abstract
Acquire solids nuclear magnetic resonance (solids-NMR) capability to enable characterization of polymers and other solid state materials of relevance to DoD. Instrumentation Acquired: A solids-NMR accessory was acquired for an existing Bruker AC 250 (1H resonance at 250 MHz) liquids-NMR spectrometer. The acquired equipment included: (a) 35 W buffer amplifier, (b) 120 W radio frequency (RF) amplifier for 1H decoupling, (c) 300 W broadband rf amplifier for non-1H nuclei, and (d) 7 mm sample diameter (0.300 ml sample volume) cross polarization magic angle spinning (CP MAS) probe with pneumatic control unit. The apparatus was installed and tested by specialists from Bruker Instruments, Billerica, MA. Research Supported by Instrumentation: The first solid sample investigated using the newly acquired apparatus was the monomer 1,5,7,11 tetraoxospiro 5,5 undecane, commonly called spiroorthocarbonate(0,0). This is an example of a monomer that polymerize without reduction in volume. Research to be Supported by Instrumentation: Solids-NMR will be used to help determine the structures of organic polymers and inorganic solid state materials of relevance to DoD. The polymers include ladder- and semi ladder shaped highly conjugated polymers and their monomers, and polyurethane coating materials. The inorganic solids include catalytic zeolites and ferrierites. Relevant nuclei are: 27 Al (65 MHz), 13C (63 MHz), 29Si (50 MHz) and 15N (25 MHz).
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 14, 1997
- Accession Number
- ADA339348
Entities
People
- T. C. Sandreczki