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Thermal decomposition products of copoly(arylene ether sulfone)s characterized by direct pyrolysis mass spectrometry

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Title: Thermal decomposition products of copoly(arylene ether sulfone)s characterized by direct pyrolysis mass spectrometry
Authors: Samperi, Filippo1 fsamperi@unict.it, Puglisi, Concetto1, Ferreri, Tiziana1, Messina, Rosario1, Cicala, Gianluca2, Recca, Antonino2, Restuccia, Carmelo Luca2, Scamporrino, Andrea2
Source: Polymer Degradation & Stability. Jul2007, Vol. 92 Issue 7, p1304-1315. 12p.
Subjects: Pyrolysis, Chemical reactions, Dibenzofurans, Biphenyl compounds, Hydroquinone
Abstract: Abstract: Pyrolysis products with mass of up to 850Da were detected by direct pyrolysis mass spectrometric (DPMS) analysis of a series of copoly(arylene ether sulfone)s (PES–PPO) synthesized by nucleophilic condensation of either 4,4′-dichlorodiphenylsulfone (CDPS) or 4,4′-bis-(4-chlorophenyl sulfonyl) biphenyl (long chain dichloride, LCDC) with different molar ratios of hydroquinone (HQ) or dihydroxydiphenylsulfone (HDPS). Pyrolysis products retaining the repeating units of the initial copolymers were formed at temperatures ranging from 420°C to 470°C (near the initial decomposition temperature). At temperatures higher than 450°C were observed products containing biphenyl units, formed by the elimination process of SO2 from diphenyl sulfone bridges. Products having biphenyl and dibenzofuran moieties were detected in the mass spectra recorded at temperatures above 550°C. These units were formed by loss of hydrogen atom from diphenyl ether bridges. Although the EI (18eV) mass spectra of the pyrolysis products of the samples investigated were very similar, it was found that the relative intensity of some ions reflects the molar composition of the copolymers analysed. Cyclic and linear oligomers with very low molecular mass, present in the crude copolymers, were also detected by DPMS. Thermogravimetric analysis also showed their excellent thermal stability below 400°C. It indicates that the copolymers yield a char residue of 40–45% at 800°C, which increases with the PPO mole fraction in the samples. [Copyright &y& Elsevier]
Copyright of Polymer Degradation & Stability is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Thermal decomposition products of copoly(arylene ether sulfone)s characterized by direct pyrolysis mass spectrometry
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  Data: <searchLink fieldCode="AR" term="%22Samperi%2C+Filippo%22">Samperi, Filippo</searchLink><relatesTo>1</relatesTo><i> fsamperi@unict.it</i><br /><searchLink fieldCode="AR" term="%22Puglisi%2C+Concetto%22">Puglisi, Concetto</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Ferreri%2C+Tiziana%22">Ferreri, Tiziana</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Messina%2C+Rosario%22">Messina, Rosario</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Cicala%2C+Gianluca%22">Cicala, Gianluca</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Recca%2C+Antonino%22">Recca, Antonino</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Restuccia%2C+Carmelo+Luca%22">Restuccia, Carmelo Luca</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Scamporrino%2C+Andrea%22">Scamporrino, Andrea</searchLink><relatesTo>2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Polymer+Degradation+%26+Stability%22">Polymer Degradation & Stability</searchLink>. Jul2007, Vol. 92 Issue 7, p1304-1315. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Pyrolysis%22">Pyrolysis</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+reactions%22">Chemical reactions</searchLink><br /><searchLink fieldCode="DE" term="%22Dibenzofurans%22">Dibenzofurans</searchLink><br /><searchLink fieldCode="DE" term="%22Biphenyl+compounds%22">Biphenyl compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Hydroquinone%22">Hydroquinone</searchLink>
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  Data: Abstract: Pyrolysis products with mass of up to 850Da were detected by direct pyrolysis mass spectrometric (DPMS) analysis of a series of copoly(arylene ether sulfone)s (PES–PPO) synthesized by nucleophilic condensation of either 4,4′-dichlorodiphenylsulfone (CDPS) or 4,4′-bis-(4-chlorophenyl sulfonyl) biphenyl (long chain dichloride, LCDC) with different molar ratios of hydroquinone (HQ) or dihydroxydiphenylsulfone (HDPS). Pyrolysis products retaining the repeating units of the initial copolymers were formed at temperatures ranging from 420°C to 470°C (near the initial decomposition temperature). At temperatures higher than 450°C were observed products containing biphenyl units, formed by the elimination process of SO2 from diphenyl sulfone bridges. Products having biphenyl and dibenzofuran moieties were detected in the mass spectra recorded at temperatures above 550°C. These units were formed by loss of hydrogen atom from diphenyl ether bridges. Although the EI (18eV) mass spectra of the pyrolysis products of the samples investigated were very similar, it was found that the relative intensity of some ions reflects the molar composition of the copolymers analysed. Cyclic and linear oligomers with very low molecular mass, present in the crude copolymers, were also detected by DPMS. Thermogravimetric analysis also showed their excellent thermal stability below 400°C. It indicates that the copolymers yield a char residue of 40–45% at 800°C, which increases with the PPO mole fraction in the samples. [Copyright &y& Elsevier]
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  Data: <i>Copyright of Polymer Degradation & Stability is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.polymdegradstab.2007.03.015
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      – SubjectFull: Dibenzofurans
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      – SubjectFull: Biphenyl compounds
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              Text: Jul2007
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