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Properties of poly(vinyl alcohol)‐ graft ‐polyacrylamide copolymers depending on the graft length. 1. Redistribution of hydrogen bonds and its influence on the copolymer behavior in aqueous solution
Author(s) -
Zheltonozhskaya Tatyana,
Demchenko Olga,
Rakovich Irina,
Guenet JeanMichel,
Syromyatnikov Vladimir
Publication year - 2003
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200351316
Subject(s) - copolymer , vinyl alcohol , polyacrylamide , polymer chemistry , aqueous solution , hydrogen bond , polymer , macromolecule , intramolecular force , materials science , intrinsic viscosity , hydrodynamic radius , chemical engineering , chemistry , molecule , organic chemistry , composite material , biochemistry , engineering
A series of poly(vinyl alcohol)‐ graft ‐polyacrylamide copolymers (PVA‐ g ‐PAA) with a constant number N but various molecular weights (lengths) of graft chains, which are intramolecular polymer‐polymer complexes (intraPC), were investigated. The changes in the system of intramolecular hydrogen bonds and state of macromolecules in a solution are considered. The effect of partial detachment of PAA grafts from the main chain caused by the increase in molecular weight of grafts to a more than some critical value ( M̄ vPAAcrit ≈4.3·10 5 at N =9) has been revealed. When the length of grafts increases, the thermodynamic quality of water with respect to copolymers improves. The values of z‐average radius of inertia, characteristic viscosity and the number of macromolecules in associate go through a minimum at M̄ vPAA =4.3·10 5 and then sharply grow with increasing length of grafts.