Syntheses and thermodynamic studies on the protonation behaviour of polymers containing acylpiperazinyl units in the backbone or in the side chain of a vinyl polymer
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E-Artikel
Titel:
Syntheses and thermodynamic studies on the protonation behaviour of polymers containing acylpiperazinyl units in the backbone or in the side chain of a vinyl polymer
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<jats:title>Abstract</jats:title><jats:p>Linear poly(1,4‐piperazinediyl‐1‐oxotrimethylene) (<jats:bold>1</jats:bold>), in which amido and tertiary amino groups regularly alternate along the macromolecular chain, the isomeric poly[1‐(1‐piperazinyl‐carbonyl)ethylene] (<jats:bold>8</jats:bold>) for polyvinylic structure and its <jats:italic>N</jats:italic>‐methylated derivative, poly{1‐[(4‐methyl‐1‐piperazinyl)carbonyl]ethylene} (<jats:bold>3</jats:bold>), were prepared and characterized. Their protonation behaviour was investigated in aqueous solution by potentiometric and calorimetric techniques. In all cases the basicity constants were found to decrease linearly with α (the degree of protonation), whereas the enthalpy changes show a different behaviour toward protonation. The thermodynamic values indicate the important role of hydrophobic interactions.</jats:p>