Temperature-programmed pyrolysis hyphenated with metastable atom bombardment ionization mass spectrometry (TPPy/MAB-MS) for the identification of additives in polymers.

摘要: Thermoanalytical techniques are currently used for the analysis of additives contained in polymers that cannot be easily dissolved, extracted, or hydrolyzed. With these techniques, heated to liberate trapped polymer matrix. If is slowly, up its thermal degradation, technique called temperature-programmed pyrolysis (TPPy). For TPPy experiments, mass spectrometry generally as detection method. The ionization sources commonly spectrometry, such CI and EI, can cause fragmentation during process. Fragmentation decreases sensitivity molecular ions increases risks interferences with compounds coming from An energy-tunable technique, metastable atom bombardment (MAB), proposed TPPy/MS experiments. this source, energy depends on gas used. low-energy gases Xe N2, reduced compared CI, whereas medium-energy Ar Kr, similar observed CI. TPPy/MAB-MS was performed an unknown polyurethane-based car paint. characteristic fragments MAB(N2) led identification two light stabilizers: Bis(1,2,2,6,6-pentamethyl-4-piperidinyl)sebacate (BPPS) 2-(2H-benzotriazol-2-yl)-4,6-di-tert-pentylphenol (PTPP). Using MAB(Ar) simulate ion one BPPS were not detected, thus confirming advantage using