FINGERPRINTING OF POLYMER SURFACES WITH CF-252 PARTICLE DESORPTION MASS-SPECTROMETRY
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Cf-252 particle desorption mass spectrometry (PDMS) has been applied to a series of industrial polymers. PDMS is a surface technique suited for analysis of polymers since 105 fission fragments impinging on the target are sufficient to obtain a mass spectrum, thus minimizing surface damage and charge-up. Positive and negative ion spectra with masses up to m/z 400 amu were obtained for the following samples: polystyrene, poly (alpha methylstyrene), poly (ethylene terephthalate), poly (methyl methacrylate), and poly (butyl methacrylate). Polymers were studied in the form of solvent recuperated films or as self-standing films. The mass spectra of positive and negative ions showed masses corresponding to different sized monomer fragments. For each polymer, its spectrum can be used as a fingerprint. The mass spectra were compared to those obtained by other mass spectrometric techniques. 1988, American Vacuum Society. All rights reserved.