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Thermal stability of poly (4,4′-methylenedianiline) salts and their bases

Anand, Jayashree and Palaniappan, S and Sathyanarayana, DN (1996) Thermal stability of poly (4,4′-methylenedianiline) salts and their bases. In: Synthetic Metals, 82 (1). pp. 23-26.

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Abstract

Poly(4,4′-methylenedianiline) (PMDA) salts have been synthesized by chemical polymerization of 4,4′-methylenedianiline using five different protonic acids, The salts were converted into their bases by using aqueous ammonium hydroxide. The thermal stabilities of the salts and bases have been determined from thermogravimetric analysis. The PMDA salts undergo a three-step weight loss process. The water molecules escape from the polymer matrix in the first step, followed by the loss of low molecular weight fragments and finally the decomposition of the polymer backbone occurs. The activation energy for the polymer degradation process has been calculated using two different methods. The polymer bases are slightly more stable than their corresponding salts.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: Poly(4,4’-methylenedianiline);Thermal stability;Thermogravimetric analysis;Differential thermal analysis;Activation energy
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 18 Jan 2007
Last Modified: 19 Sep 2010 04:33
URI: http://eprints.iisc.ernet.in/id/eprint/9312

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