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Measurement of synthetic polymers: Polystyrene

Polystyrene (PS)1000 and 2400 were measured using the JMS-S3000 SpiralTOF. The [M+H]+ peaks of PS with the basic monomer units of 104u (Fig.1) were observed for each sample. The mass spectrum of PS1000 and an expanded view around m/z 1000 are shown in Fig. 2. The resolving power at m/z 1101 was approximately 50,000 (FWHM). The mass difference between 8, 9 and 10-mers showed a very good match with the theoretical mass number (104.0626) calculated from the elemental composition of the repeating unit (C8H8). The mass spectrum of PS2400 and the expanded view of the isotopic pattern of 23-mer are shown in Fig 3. The observed isotopic pattern of the 23-mer is in very good agreement with the simulated isotopic distribution (R 60,000).

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