Two reaction routes for the preparation of aromatic polyoxadiazoles and polytriazoles: Syntheses and properties

Hensema, E.R. and Boom, J.P. and Mulder, M.H.V. and Smolders, C.A. (1994) Two reaction routes for the preparation of aromatic polyoxadiazoles and polytriazoles: Syntheses and properties. Journal of Polymer Science, Part A: Polymer chemistry, 32 (3). pp. 513-525. ISSN 0887-624X

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Abstract:	Two reaction routes for the preparation of aromatic poly-1,3,4-oxadiazoles and poly-1,2,4-triazoles are studied and their influence on the physical properties, i.e., inherent viscosity, glass transition, degradation temperature, and film integrity of the final products are discussed. Aromatic poly-1,3,4-oxadiazoles are prepared by means of a polycondensation reaction of terephthaloyl chloride and isophthalic dihydrazide yielding a precursor polymer, poly(p, m-phenylene) hydrazide, which is converted into the corresponding poly-1,3,4-oxadiazole by means of a cyclodehydration reaction. Poly-1,3,4-oxadiazoles are also prepared by means of a polycondensation reaction between terephthalic and isophthalic acid and hydrazine yielding poly-1,3,4-oxadiazoles with higher inherent viscosities. Flexible poly-1,3,4-oxadiazole films are obtained only if the inherent viscosities of the polymers used are higher than 2.7 dL/g. The thermal stability is found to increase with increasing content of p-phenylene groups in the polymer backbone. Aromatic poly-1,2,4-triazoles are prepared using polyhydrazides with alternating para- and meta-phenylene groups and poly-1,3,4-oxadiazoles with a random incorporation of para- and meta-phenylene groups in the main chain as precursor polymers. The glass transition temperatures are found to increase with increasing content of p-phenylene groups in the main chain of these polymers. Cold crystallization is observed only for the alternating polymer.
Item Type:	Article
Copyright:	© 1994 Wiley InterScience
Research Group:	Membrane Science and Technology (MST)
Link to this item:	http://purl.utwente.nl/publications/71125
Official URL:	http://dx.doi.org/10.1002/pola.1994.080320313
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