Cyclo dehydration reaction of polyhydrazides. I. Kinetic parameters obtained with nonisothermal thermogravimetry

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Gebben, B. and Mulder, M.H.V. and Smolders, C.A. (1988) Cyclo dehydration reaction of polyhydrazides. I. Kinetic parameters obtained with nonisothermal thermogravimetry. Journal of Polymer Science, Part A: Polymer chemistry, 26 (7). pp. 1743-1755. ISSN 0887-624X

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Abstract:The thermal conversion reaction of poly-(1,3-phenyl-1,4-phenyl)-hydrazide into poly-(1,3-phenyl-1,4-phenyl)-1,3,4-oxadiazole has been studied using thermogravimetry (TG). For the evaluation of the energie of activation and other kinetic parameters of this cyclo dehydration reaction a method developed by Ozawa was used, where polymer samples are heated with different constant heating rates. With this method the energy of activation can be determined accurately as a function of the degree of conversion. In this way a parallel reaction could be observed starting at the end of the nonisothermal conversion process. The polymer was used in two different morphological states, a powder and a film. A slightly higher energy of activation and a considerably higher pre-exponential factor were observed for the film indicating a dependency of the kinetics on the morphological state or on the history of the polymer sample.
Item Type:Article
Copyright:© 1988 Wiley InterScience
Link to this item:http://purl.utwente.nl/publications/70858
Official URL:http://dx.doi.org/10.1002/pola.1988.080260706
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