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Study of the thermal stabilities of some polymeric schiff-bases containing sulphur

✍ Scribed by Ahmed A. Kassem; El-Sayed M.E. Mansour; H. Nour El-Din; Ahmed A. El-Toukhy; Sherif H. Kandil

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
437 KB
Volume
28
Category
Article
ISSN
0014-3057

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✦ Synopsis

Al~raet--The relationship of the thermal stabilities of some polymeric Schiff-bases to their chemical structures was studied by using thermogravimetric analysis and differential thermal analysis. Polymeric Schiff-bases were prepared by the condensation of 5,5'-methylene-bis-salicylaldehyde, terephthalaldehyde, di(p-formylphenyl) terephthalate or di(p-acetylphenyl) terephthalate with various diamines containing sulphur, such as thiocarbohydrazide, bis (4-aminophenyl) sulphone, 4,4'-diaminostilbene-2,2'-disulphonic acid and 3,5-diaminobenzene sulphonic acid. Two monomeric prototypes of these polymeric Schiff-bases were prepared in order to compare their thermal stabilities with the corresponding polymers.

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On the Stability of the Schiff Bases of Pyridoxal 5β€²-Phosphate with Polypeptides Containing L-Lysine
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We determined the apparent equilibrium constant of formation, KpH, of the Schijf bases of pyridoxal 5'-phosphate (PLP) and poly-and copolymers containing L-lysine, as a function of pH at 25" and a constant ionic strength of 0 . 1 ~. The KPH values obtained at acidic and neutral pH were larger that t