Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 59: Issue 3
Thermal Degradation of The Poly(m-phenylene Oxadiazole) Molecules in Sulphuric Acid
Authors:
P. Lavrenko Russian Academy of Sciences Institute of Macromolecular Compounds 199004 St. Petersburg Bolshoy Pr., 31 Russia 199004 St. Petersburg Bolshoy Pr., 31 Russia

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O. Okatova Russian Academy of Sciences Institute of Macromolecular Compounds 199004 St. Petersburg Bolshoy Pr., 31 Russia 199004 St. Petersburg Bolshoy Pr., 31 Russia

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K. Andreeva Russian Academy of Sciences Institute of Macromolecular Compounds 199004 St. Petersburg Bolshoy Pr., 31 Russia 199004 St. Petersburg Bolshoy Pr., 31 Russia

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B. Schulz University of Potsdam Research Center Thin Organic and Biochemical Films Kantstrasse 55 D-14513 Teltow Germany Kantstrasse 55 D-14513 Teltow Germany

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Pages:
741–746
Online Publication Date:
02 Nov 2004
Publication Date:
01 Mar 2000
Article Category:
Research Article
DOI:
https://doi.org/10.1023/a:1010145518968
Restricted access

Abstract  

Translational diffusion of poly-2,5-(1,3-phenylene)-1,3,4-oxadiazole (PMOD) in solution in 96% sulphuric acid was studied, and intrinsic viscosity was measured at different stages of thermal degradation. Polymer solution has previously been subjected to heating at temperature ranging from 75 to 104C and then investigated at 26C. A monotonic decrease in intrinsic viscosity and the molecular mass, M, of degraded products with increasing degradation temperature was detected. The rate constant of the degradation process has been obtained from the change in M of the degradation products with time at a fixed solution temperature, and the activation energy of the process was calculated by using the temperature dependence of the rate constant. The activation energy (E =1028 kJ–1 ) is close to that obtained previously for the hydrolysis of poly-2,5-(1,4-phenylene)-1,3,4-oxadiazole (PPOD) in sulphuric acid (106 kJ–1 ), the rate constant being approximately twice in the value.

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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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