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Properties of aqueous salt solutions of poly(vinylpyrrolidone). II. Polymer dimensions and thermodynamic quantities
Author(s) -
Güner Ali,
Ataman Mualla
Publication year - 1997
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199709)44:1<30::aid-pi802>3.0.co;2-6
Subject(s) - aqueous solution , enthalpy , dilution , chemistry , steric effects , salt (chemistry) , polymer , thermodynamics , potassium , viscosity , polymer chemistry , organic chemistry , physics
The unperturbed dimensions and thermodynamic parameters of poly(vinylpyrrolidone) (PVP) have been studied in aqueous salt solutions, e.g. phosphates, mono‐ and dihydrogen phosphates, carbonates, sulphates of sodium and potassium. Values of K 0 ( = [η] Θ M ‐1/2 , where [η] Θ is intrinsic viscosity at the theta temperature and M is molecular weight) with M w = 78 000 g mol ‐1 were found to range from 4·63×10 ‐4 to 5·56×10 ‐4 dl g ‐1 , and root‐mean‐square end‐to‐end distances, 〈 r 2 〉 0 1/2 , ranging from 1·61×10 ‐6 to 1·68×10 ‐6 cm were evaluated. Values of the characteristic ratio, C n , the steric parameter, σ, and the enthalpy and the entropy of dilution parameters, χ H and χ S , have also been calculated, and the interaction parameter was found to be χ‐0·5<‐0·001 for aqueous salt solutions of PVP. ©1997 SCI