Abstract
Rigorous thermodynamic analysis of polymer complexation is challenging due to the possible kinetically frozen state, complicated chain conformation, and slow chain relaxation. In this work, we study the complexation of poly(acrylic acid) (PAA) with poly(vinylpyrrolidone) (PVPON), poly(2-ethyl-2-oxazoline) (PEOX) and poly(ethylene oxide) (PEO) in acidic water and in organic solvents, including protic solvents (methanol (MeOH), ethanol (EtOH)), and aprotic solvents (N, N-dimethylformamide (DMF), N, N-dimethylacetamide (DMAC), 1-methyl-2-pyrrolidone (NMP), and dimethyl sulfoxide (DMSO)) with isothermal titration calorimetry (ITC). In DMF, complexation of PAA and PVPON has moderate heat releasing and the effect of kinetically frozen structure is negligible, and the ITC data meet the basic standard to be used for analyzing and estimating thermodynamic parameters, and enthalpy, entropy and Gibbs free energy are calculated to be −1.5 kJ/mol, 45 J/(mol⋅K), and −15 kJ/mol respectively. Furthermore, the effects of temperature, chain length contrast, and concentration on the complexation of PAA with PVPON in DMF are studied. The work provides a theoretical method how to evaluate the ITC dada of hydrogen-bonding polymer complexation for thermodynamic analysis and strengthens the understanding of polymer complex.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
