E. Meaurio et al., STUDY OF THE SOLVENT ROLE ON COMPLEXATION IN SYSTEMS POLY(MONO N-ALKYL ITACONATE) TERTIARY POLYAMIDE, Polymer, 39(2), 1998, pp. 379-385
This paper reports a study of the solvent role on complexation in syst
ems composed by a polyacid and a polybase. Complexation has been found
in water, n-alcohols, ethers and acetone, depending on the chosen pol
ymer pair and temperature. The temperature at which the transition fro
m a biphasic system to homogeneous solution occurs, has been employed
as a measure of the relative stability of the complex. In general, com
plexes with bulky side groups are less stable than those with small on
es. The influence of solvophobic and hydrophobic interactions has been
discussed. The stability of complexes in ethers shows a marked depend
ence on the aliphatic character of the polymeric system, showing a com
plexing character similar to that of n-alcohols for the polymer system
s with lower aliphatic character. Acetone is the most complexing solve
nt, probably due to its lower competing ability. Finally, it has been
found that the relative stability of complexes with poly(ethyloxazolin
e) (compared with those with poly(N,N-dimethylacrylamide)) increases w
ith the size of the side group of the poly(mono n-alkyl itaconate). (C
) 1997 Elsevier Science Ltd.