作者: Simona Lavrič , Drago Kočar , Igor Mihelič , Carl Braybrook
DOI: 10.1016/J.PORGCOAT.2014.12.010
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摘要: Abstract Separation of 57 species from solutions commercial melamines and analysis by high resolution mass spectrometry using electrospray ionisation atmospheric pressure chemical is reported. Structures for melamine-based crosslinked polymers were also confirmed with two orthogonal techniques characterisation polymers: Fourier Transform Infrared Spectrometry (FTIR) Nuclear Magnetic Resonance spectroscopy (NMR), respectively. Accurate measurements melamine–formaldehyde resin structures achieved in the ppm range, an internal calibration standard reserpine. Results within 5 ppm calculated formulae. Relative isotopic abundances [M+H] + ions evaluated different fractions. independent mobile phase used. NMR studies fractions their thermal stability up to 70 °C. Differences spectra explained change conformation it was that this a reversible process reheating samples. Stability at 70 °C MS, since when temperature ion transfer capillary MS set above decomposition occurred.