Thermal degradation of poly(butylene terephthalate) at the processing temperature
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| Title: | Thermal degradation of poly(butylene terephthalate) at the processing temperature |
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| Authors: | Samperi, Filippo1 fsamperi@dipchi.unict.it, Puglisi, Concetto2, Alicata, Rossana2, Montaudo, Giorgio2 |
| Source: | Polymer Degradation & Stability. Jan2004, Vol. 83 Issue 1, p11. 7p. |
| Subjects: | Polyethylene terephthalate, Oligomers, Butene, Polyesters, Anhydrides, Thermoplastics, Phthalate esters, Polymers |
| Abstract: | In an accompanying paper [Samperi et al., Polym Degrad Stab (in press)] we have reported an investigation on the isothermal degradation of poly(ethylene terephthalate) (PET) and present here a parallel study on poly(butylene terephthalate) (PBT). Although the two aromatic polyesters are structurally quite similar, our results show that the presence of the butylene unit in PBT is apparently able to induce significant changes in the isothermal degradation of PBT compared to PET. A rationalisation of the differences observed is offered. Several isothermal degradation experiments on PBT were conducted in the temperature range of 270–350 °C, in order to simulate the reactions that take place in the actual processing of PBT. The structural characterisation of the reaction products was performed by MALDI Mass Spectrometry and by NMR analysis. The results indicate that the cyclic oligomers of PBT formed at temperatures below 290 °C by ring-chain equilibration mechanism undergo thermal decomposition at higher temperature by a β-hydrogen transfer mechanism, as well as the open PBT chains. The formation of unsaturated oligomers was detected by MALDI and also by 1H and 13C NMR techniques, whereas in contrast to the thermally degraded PET sample terephthalic anhydride-containing oligomers were not observed. Formation of butadiene was suggested by 1H NMR data on PBT samples processed at various temperatures. [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.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 12507616 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Thermal degradation of poly(butylene terephthalate) at the processing temperature – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Samperi%2C+Filippo%22">Samperi, Filippo</searchLink><relatesTo>1</relatesTo><i> fsamperi@dipchi.unict.it</i><br /><searchLink fieldCode="AR" term="%22Puglisi%2C+Concetto%22">Puglisi, Concetto</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Alicata%2C+Rossana%22">Alicata, Rossana</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Montaudo%2C+Giorgio%22">Montaudo, Giorgio</searchLink><relatesTo>2</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Polymer+Degradation+%26+Stability%22">Polymer Degradation & Stability</searchLink>. Jan2004, Vol. 83 Issue 1, p11. 7p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Polyethylene+terephthalate%22">Polyethylene terephthalate</searchLink><br /><searchLink fieldCode="DE" term="%22Oligomers%22">Oligomers</searchLink><br /><searchLink fieldCode="DE" term="%22Butene%22">Butene</searchLink><br /><searchLink fieldCode="DE" term="%22Polyesters%22">Polyesters</searchLink><br /><searchLink fieldCode="DE" term="%22Anhydrides%22">Anhydrides</searchLink><br /><searchLink fieldCode="DE" term="%22Thermoplastics%22">Thermoplastics</searchLink><br /><searchLink fieldCode="DE" term="%22Phthalate+esters%22">Phthalate esters</searchLink><br /><searchLink fieldCode="DE" term="%22Polymers%22">Polymers</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: In an accompanying paper [Samperi et al., Polym Degrad Stab (in press)] we have reported an investigation on the isothermal degradation of poly(ethylene terephthalate) (PET) and present here a parallel study on poly(butylene terephthalate) (PBT). Although the two aromatic polyesters are structurally quite similar, our results show that the presence of the butylene unit in PBT is apparently able to induce significant changes in the isothermal degradation of PBT compared to PET. A rationalisation of the differences observed is offered. Several isothermal degradation experiments on PBT were conducted in the temperature range of 270–350 °C, in order to simulate the reactions that take place in the actual processing of PBT. The structural characterisation of the reaction products was performed by MALDI Mass Spectrometry and by NMR analysis. The results indicate that the cyclic oligomers of PBT formed at temperatures below 290 °C by ring-chain equilibration mechanism undergo thermal decomposition at higher temperature by a β-hydrogen transfer mechanism, as well as the open PBT chains. The formation of unsaturated oligomers was detected by MALDI and also by 1H and 13C NMR techniques, whereas in contrast to the thermally degraded PET sample terephthalic anhydride-containing oligomers were not observed. Formation of butadiene was suggested by 1H NMR data on PBT samples processed at various temperatures. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab 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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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/S0141-3910(03)00167-8 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 7 StartPage: 11 Subjects: – SubjectFull: Polyethylene terephthalate Type: general – SubjectFull: Oligomers Type: general – SubjectFull: Butene Type: general – SubjectFull: Polyesters Type: general – SubjectFull: Anhydrides Type: general – SubjectFull: Thermoplastics Type: general – SubjectFull: Phthalate esters Type: general – SubjectFull: Polymers Type: general Titles: – TitleFull: Thermal degradation of poly(butylene terephthalate) at the processing temperature Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Samperi, Filippo – PersonEntity: Name: NameFull: Puglisi, Concetto – PersonEntity: Name: NameFull: Alicata, Rossana – PersonEntity: Name: NameFull: Montaudo, Giorgio IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 01 Text: Jan2004 Type: published Y: 2004 Identifiers: – Type: issn-print Value: 01413910 Numbering: – Type: volume Value: 83 – Type: issue Value: 1 Titles: – TitleFull: Polymer Degradation & Stability Type: main |
| ResultId | 1 |
