Mass spectrometric detection of cyclic oligomers in polyurethanes and polyureas

Thermal degradation of aromatic-aliphatic polyethers. 1. Direct pyrolysis-mass spectrometry

“…We have provided several examples of this fact. 18 In the case of polymer I (Table I), two pre-formed oligomers are detected. Figure la reports the total ion current (TIC) vs. temperature of a crude sample of polymer I.…”

Thermal degradation of aromatic-aliphatic polyethers. 2. Flash pyrolysis-gas chromatography-mass spectrometry

“…' The relative abundances of the El fragments are given in parentheses, using the library search of the Kratos DS 55 software, except for peaks (e). 76) 115 (100), 63 (13), 89 (8), 51 (7), 62 (7), 50 (6) propynylbenzene 10 120 (60) 91 (100), 119 (64), 65 (32), 39 (30), 63 (21), 51 (13) methylbenzaldehyde 11 108 (100) 107 (72), 77 (32), 79 (32), 39 (28), 90 (25), 51 (21) methylphenol 12 122 (36) 94 (100), 66 (11), 39 (8), 77 (8), 95 (7), 65 (6) (18), 104 (15) hydroxybenzaldehyde 20 180 (20) 110 (100), 81 (8), 65 (6), 53 (5), 43 (5), 122 (4) pentoxyphenol' (40) ethylhexenylphenol'…”

“…The most numerous peaks in the GC tracing (Figure 3) are due to ether, olefin, and aromatic compounds. Benzofuran and dibenzofuran are also present, among the (18), 181 (13), 76 (13) 169 (68), 141 (32), 115 hydroxybiphenyl "Peak numbers (25), 168 (13), 171 (11), 142 (11) in Figure 1 and compound numbers in text. 6 Molecular ion in the corresponding El spectrum; the relative intensities are given in parentheses.…”

Direct Mass Spectrometry of Polymers

“…1 Applications of mass spectrometry to polymers oligomers formed in low amounts during the synthesis of some polyurethanes and polyureas. 16 In another case it could be established that two silarylene copolymers contained a mixture of low molecular weight oligomers formed with the high polymer in the synthesis. Five different oligomers were present in each case, distilling over a wide range of temperatures (80-ZSOOC).…”