Study of Thermal Degradation of Fractionated Polystyrenes by Pyrolysis Gas Chromatography

Tsuge, Shin; Okumoto, Tadaoki; Takeuchi, Tsugio

doi:10.1093/chromsci/7.4.250

Cited by 36 publications

(7 citation statements)

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“…Figure shows the observed partial pyrograms in the trimer region for L-1, L-2, L-3, and R-1. The entire pyrograms of R-1 and the model linear P2VPs were almost identical, reflecting basically the same decomposition pathways due to their sufficiently large molecular weight over “a level of stabilization” which is to be around M n ∼ 10 4 . As shown in Figure , only some minor differences are observed around the trimer region which should be attributed to the specific microstructures such as the coupling moiety and initiator residue.…”

Section: Resultsmentioning

confidence: 78%

Ring Structure of Cyclic Poly(2-vinylpyridine) Proved by Pyrolysis−GC/MS

et al. 1999

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Poly(2-vinylpyridine) (P2VP) with cyclic structure was tentatively prepared through the reaction of linear P2VP having two living ends followed by coupling with a bifunctional coupling agent. Thus, prepared crude product was fractionated by preparative size exclusion chromatography in order to enrich the cyclic polymer portion. Then the existence of the ring structure in the fractionated P2VP sample was directly confirmed for the first time by pyrolysis-gas chromatography/mass spectrometry by detecting the characteristic fragments reflecting the coupling moiety of the polymers at which the coupling agent combined the living 2VP units at both functional points.

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Section: Resultsmentioning

confidence: 78%

Ring Structure of Cyclic Poly(2-vinylpyridine) Proved by Pyrolysis−GC/MS

et al. 1999

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“…The pyrolysis of PS using He carrier gas has been widely studied, and detailed discussions have been made on the thermal degradation mechanism. The main pyrolyzates are reported to be the styrene monomer (S), dimer (SS), and trimer (SSS). − Metals in the polystyrene (PS) sample were determined by XRF, and the results are summarized in Table . The trace metal residues, which may be originated from the polymerization catalysts, could cause hydrogenation reaction during pyrolysis of PS in a H 2 atmosphere.…”

Section: Resultsmentioning

confidence: 99%

Hydrogenation Reactions during Pyrolysis-Gas Chromatography/Mass Spectrometry Analysis of Polymer Samples Using Hydrogen Carrier Gas

Watanabe¹,

Watanabe²,

Freeman

et al. 2016

Anal. Chem.

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Pyrolysis-gas chromatography/mass spectrometry of polymer samples is studied focusing on the effect of hydrogen (H2) carrier gas on chromatographic and spectral data. The pyrograms and the related mass spectra of high density polyethylene (HDPE), low density polyethylene, and polystyrene (PS) serve to illustrate the differences between the species formed in H2 and the helium environment. Differences in the pyrograms and the spectra are generally thought to be a result of the hydrogenation reaction of the pyrolyzates. From the peak intensity changes in the pyrograms of HDPE and PS, hydrogenation of unsaturated pyrolyzates is concluded to occur when the pyrolysis is done in H2. Moreover, additional hydrogenation of the pyrolyzates occurs in the electron ionization source of a MS detector when H2 is used as a carrier gas. Finally, the applicability of mass spectral libraries to characterize pyrograms obtained in H2 is illustrated using 24 polymers. The effect of the hydrogenation reaction on the library search results is found to be negligible for most polymer samples with polar and nonpolar monomer units.

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“…This secondary reaction is mainly caused by catalytic and/or collisional interactions of the primary pyrolyzates under stagnant flow of carrier gas in the high temperature zone. Therefore, the pyrolysis chamber should generally be constructed by chemically inert materials, and its dead volume should be reduced to the practical minimum to transfer the resulting pyrolyzates swiftly from the hot zone to the separation column [2,3]. Furthermore, too slow linear velocity of the carrier gas in the pyrolysis chamber which might cause stagnation to induce the undesirable secondary reaction and peak broadening of the resulting pyrolyzates also should be avoided [4,5].…”

Section: Introductionmentioning

confidence: 99%