Polymer reactions—X thermal pyrolysis of poly(isoprene)

Chien, James C. W.; Kiang, Joseph K. Y.

doi:10.1016/0014-3057(79)90146-0

Cited by 63 publications

(28 citation statements)

References 16 publications

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“…Limonene (dimer) was the most abundant compound, with a yield of 108.8 and 120.5 mg/g sample at 380 and 480°C respectively. A similar oil composition has been noted by other authors during their investigations into the pyrolysis of natural rubber and polyisoprene (Chen and Qian, 2002;Chien and Kiang, 1979). The presence of oligomers confirms the FT-IR analysis, which suggested that the non-catalytic pyrolysis oil mainly consisted of aliphatic material.…”

Section: Characterization Of the Volatile Pyrolysis Productssupporting

confidence: 87%

“…The formation of aromatic species is explained by secondary reactions involving cyclisation, dehydrogenation, and aromatization of short chain olefins through the Diels-Alder mechanism (Chen and Qian, 2002;Chien and Kiang, 1979;Groves et al, 1991).…”

Section: Characterization Of the Volatile Pyrolysis Productsmentioning

confidence: 99%

“…Processing of waste rubber by pyrolysis has been intensively investigated in recent years, particularly with regard to scrap tyres (Berrueco et al, 2005;Conesa et al, 2004;Galvagno et al, 2007;Kyari et al, 2005;Li et al, 2005;Oledzka et al, 2006). The pyrolysis of natural rubber has also been investigated (Groves and Lehrle, 1992;Groves et al, 1991;Seidelt et al, 2006) as has the pyrolysis of natural rubbers main constituent, polyisoprene (Chen and Qian, 2002;Chiantore et al, 1995;Chien and Kiang, 1979). However, latex gloves present a special case because of the additives which are present, for example, calcium carbonate or cornstarch is used to powder the gloves.…”

Section: Introductionmentioning

confidence: 99%

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Pyrolysis of latex gloves in the presence of Y-zeolite

2009

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In this study we have investigated the possibility of processing waste rubber gloves using pyrolysis. Y-zeolite catalyst was employed to upgrade the pyrolysis products to give higher yields of valuable aromatic compounds such as toluene and xylenes. The composition of the pyrolysis products was determined using GC-MS, GC-FID, GC-TCD, and FT-IR. It was found that when rubber gloves were pyrolysed in the absence of a catalyst, the pyrolysis oil consisted mainly of limonene and oligomers of polyisoprene. When Y-zeolite was added to the reaction system, the yields of toluene, xylene, methylbenzenes, ethylbenzenes, and naphthalenes increased dramatically. The Y-zeolite also catalysed the decomposition of limonene, which was absent from the catalytic pyrolysis products. The presence of the Yzeolite catalyst also increased the yield of hydrocarbon gases. The tests were carried out at both 380°C and 480°C and it was found that the higher reaction temperature led to increased yields of all the major compounds, both in the presence and absence of the Y-zeolite catalyst.

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Section: Characterization Of the Volatile Pyrolysis Productssupporting

confidence: 87%

Section: Characterization Of the Volatile Pyrolysis Productsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pyrolysis of latex gloves in the presence of Y-zeolite

2009

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“…[1][2][3][4][5] Pyrolysis-gas chromatography (Py-GC), pyrolysis-mass spectrometry (Py-MS), and Py-GC/MS have been used for decades to elucidate the structures of rubbers. [6][7][8][9][10][11][12] Pyrolysis of BR has been studied by many researchers using Py-GC or Py-GC/MS. 1,10,13,14 The major volatile products formed from BR by pyrolysis are butadiene (C4-species), cyclopentene (C5-species), cyclohexene and cyclohexadiene (C6-species), 1,4-cycloheptadiene (C7-species), and 4-vinylcyclohexene (C8-species).…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis paths of polybutadiene depending on pyrolysis temperature

Choi

Han

2006

Macromol. Res.

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Polybutadiene (BR) was pyrolyzed at 540-860 o C and the effect of pyrolysis temperature on variations in the relative abundance of the major pyrolysis products (C4-, C5-, C6-, C7-, and C8-species) was investigated. Formation of the C4-, C5-, C6-, and C7-species competed with that of the C8-species. Relative intensity of the C8-species decreased with increasing pyrolysis temperature, while that of the C5-, C6-, and C7-species increased. Pyrolysis paths were became more complicated with increasing pyrolysis temperature. We suggested the operation of double bond migration and succeeding rearrangements for the formation of the C5-and C7-species and various rearrangements, including a double bond, for the formation of the C6-species at high temperature. The activation energies for the pyrolysis product ratios of (C5+C6+C7)/C4 and C8/C4 were used to explain the competition reactions to form the pyrolysis products.

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“…NBR is generally used for gaskets and o-rings in fuel systems. Pyrolysis-gas chromatography (Py-GC), pyrolysis-mass spectrometry (Py-MS), and Py-GC/MS are very useful technologies for analyzing the structures of rubbers [1][2][3][4]. Zoller and Johnston [5] studied thermal degradation of NBR using photoionization mass spectrometry at low temperatures below 500 8C.…”

Section: Introductionmentioning

confidence: 99%