Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 70: Issue 3
The degradation mechanism using TG-MS technique of some aromatic polyethers containing flexible spacers
Authors:
N. Hurduc 'A.I.Cuza' University of Iasi Department of Theoretical and Physical Chemistry Bd Copou 11 A 6600 Iasi Romania Bd Copou 11 A 6600 Iasi Romania

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A. Creanga 'A.I.Cuza' University of Iasi Department of Theoretical and Physical Chemistry Bd Copou 11 A 6600 Iasi Romania Bd Copou 11 A 6600 Iasi Romania

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Gy. Pokol Technical University of Budapest Institute of General and Analytical Chemistry Szent Gellért Tér 4 1111 Budapest Hungary Szent Gellért Tér 4 1111 Budapest Hungary

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Cs. Novák Technical University of Budapest Institute of General and Analytical Chemistry Szent Gellért Tér 4 1111 Budapest Hungary Szent Gellért Tér 4 1111 Budapest Hungary

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D. Scutaru Technical University of Iasi Faculty of Chemical Engineering, Department of Organic Chemistry Bd. Mangeron 71 6600 Iasi Romania Bd. Mangeron 71 6600 Iasi Romania

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S. Alazaroaie Technical University of Iasi Faculty of Chemical Engineering, Department of Macromolecules Bd. Mangeron 71 6600 Iasi Romania Bd. Mangeron 71 6600 Iasi Romania

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Pages:
877–887
Online Publication Date:
03 Nov 2004
Publication Date:
01 Oct 2002
Article Category:
Research Article
DOI:
https://doi.org/10.1023/a:1022268606503
Keywords:
liquid crystals; polyethers; mass spectrometry; thermal stability
Restricted access

Abstract  

The paper presents a thermogravimetric study of some aromatic poly- and copolyethers, using mass spectrometry technique combined with thermogravimetric analysis. The polymers were synthesized by phase transfer catalysis technique, using bis(2-chloroethyl)-ether or 1,6-dichlorohexane as flexible spacers and various bisphenols (4,4'-dihydroxydiphenyl, 4,4'-dihydroxyazobenzene and bisphenol A). The presence of azobenzenic moieties in the chain induces a liquid crystalline behavior, but, due to the high values of the transition temperature, some precautions during the thermal characterisation are necessary. In the case of azobenzenic samples, the degradation reactions begin, as a function of the chemical structure, around 230-250C. A degradation mechanism based on chain transfer reactions was proposed. The chain flexibility influences the thermal degradation mechanism, in the case of rigid polymers the chain transfer reactions being less probable. For the flexible chains, the thermal stability is not essentially influenced by the copolymerisation ratio between the two aromatic bisphenols.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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