Accutof lc plus jms t100lp mass spectrometer

JEOL ECA600, ECZ400 and ECZ600 were used for recording spectra of nuclear magnetic resonance (NMR) spectra. JASCO FT/IR-4700 spectrometer was used for recording IR spectra. JEOL AccuTOF LC-plus JMS-T100LP mass spectrometer was used for obtaining HRMS spectra. JASCO an LC-2000 Plus series were used for high-performance liquid chromatography (HPLC).

The isothermal decomposition of PMMA was analyzed with an Accu-ToF LC-plus JMS-T100 LP mass spectrometer JEOL (Tokyo, Japan) working with a direct-analysis-in-real-time (DART) ion source (Ion Sense, Saugus, MA, USA). The sample was used without any prior preparation. The fragments that resulted from the decomposition process were evaporated in a stream of helium atmosphere heated at constant temperatures of 200, 250, 300, 350, 400, 450, 500 and 550 °C. The heated helium/vapor mixture was then ionized by excited metastable helium atoms before entering the ion source of the time-of-flight mass spectrometer. All the samples were analyzed with DART-ToF-MS using the Accu-TOF mass spectrometer acquired from JEOL (Tokyo, Japan). The experimental conditions were as follows: vacuum level 1.3 × 10⁵ Pa, He used as a heating and ionization gas, ring lens with a voltage of 4 V, peaks voltage of 500 V, and a mass resolution that ranged between 3600 and 4900. The sample (1–2 mg) in powder form was placed in a small piece of sandpaper and introduced between the DART outlet and the MS port inlet, and polyethylene glycol (10⁴ g·mol⁻¹) was used in this work for calibration.