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Polymers

NMR detection of thermal damage in carbon fiber reinforced epoxy resins

Composite materials of epoxy resins reinforced by carbon fibers are increasingly being used in the construction of aircraft. In these applications, the material may be thermally damaged and weakened by jet blast and accidental fires. The feasibility of using proton NMR relaxation times T1, T1ρ, and T2 to detect and quantify the thermal damage is investigated. In conventional spectrometers with homogeneous static magnetic fields, T1ρ is readily measured and is found to be …

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Analysis of Polymer Materials by Surface NMR via the NMR MOUSE

Applications are discussed of a novel NMR device, the NMR MOUSE (mobileuniversalsurfaceexplorer), for characterization of polymers. Different properties of elastomers can be related to an effective transverse relaxation parameterT2eff. Effects of multiecho sequences influence the decay curve and can be described in terms ofB0inhomogeneity and spin-lock effects. Furthermore, the signal-to-noise ratio (S/N) can be improved …

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Weathering Investigation of PVC Coatings on Iron Sheets by the NMR MOUSE

A new kind of MOUSE–the NMR mobile universal surface explorer –makes NMR investigations possible on composites with ferromagnetic components, which were previously excluded from such studies, because inhomogeneous magnetic fields are used in the first place. An example application is described, to relaxation measurements of polyvinylchloride (PVC) coatings on iron sheets. It is demonstrated that new …

Weathering Investigation of PVC Coatings on Iron Sheets by the NMR MOUSE Read More »

Weathering Investigation of PVC Coatings on Iron Sheets by the NMR MOUSE

A new kind of MOUSE–the NMR mobile universal surface explorer–makes NMR investigations possible on composites with ferromagnetic components, which were previously excluded from such studies, because inhomogeneous magnetic fields are used in the first place. An example application is described, to relaxation measurements of polyvinylchloride (PVC) coatings on iron sheets. It is demonstrated that new …

Weathering Investigation of PVC Coatings on Iron Sheets by the NMR MOUSE Read More »

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