Two poly(methacrylic acid) derivatives containing amide and carboxyl groups in the side chain of the vinyl structure, namely poly(N-methacryloylglycine) (PMP1) and poly(N-methacryloyl-β-alanine) (PMP2), were studied in aqueous solution at 25 °C by thermodynamic (potentiometry, calorirnetry, and viscometry) and spectroscopic (FT-IR) techniques together with the corresponding monomers. The basicity constants (log K) of both polymers were compared with those of other polymers with a vinyl backbone, and the anomalous behavior of PMP2 was revealed by the n value of the modified Henderson-Hasselbalch equation. The slight exothermic enthalpy changes were pH-dependent and the -ΔH° increased with the degree of protonation α for PMP1 but decreased for PMP2. The extension of hydration of the amide group revealed by FT-IR spectra was the main factor controlling the different protonation behavior of the two polyelec-trolytes. © 1991, American Chemical Society. All rights reserved.

Barbucci, R., Casolaro, M., Magnani, A., Roncolini, C. (1991). Different protonation behaviour of two poly(methacrylic acid) derivatives containing N-acyl-glycine and N-acyl-b-alanine residues: thermodynamic and FT-IR studies. MACROMOLECULES, 24(6), 1249-1257 [10.1021/ma00006a005].

Different protonation behaviour of two poly(methacrylic acid) derivatives containing N-acyl-glycine and N-acyl-b-alanine residues: thermodynamic and FT-IR studies

Casolaro, Mario;Magnani, Agnese;
1991-01-01

Abstract

Two poly(methacrylic acid) derivatives containing amide and carboxyl groups in the side chain of the vinyl structure, namely poly(N-methacryloylglycine) (PMP1) and poly(N-methacryloyl-β-alanine) (PMP2), were studied in aqueous solution at 25 °C by thermodynamic (potentiometry, calorirnetry, and viscometry) and spectroscopic (FT-IR) techniques together with the corresponding monomers. The basicity constants (log K) of both polymers were compared with those of other polymers with a vinyl backbone, and the anomalous behavior of PMP2 was revealed by the n value of the modified Henderson-Hasselbalch equation. The slight exothermic enthalpy changes were pH-dependent and the -ΔH° increased with the degree of protonation α for PMP1 but decreased for PMP2. The extension of hydration of the amide group revealed by FT-IR spectra was the main factor controlling the different protonation behavior of the two polyelec-trolytes. © 1991, American Chemical Society. All rights reserved.
1991
Barbucci, R., Casolaro, M., Magnani, A., Roncolini, C. (1991). Different protonation behaviour of two poly(methacrylic acid) derivatives containing N-acyl-glycine and N-acyl-b-alanine residues: thermodynamic and FT-IR studies. MACROMOLECULES, 24(6), 1249-1257 [10.1021/ma00006a005].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/30520
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