1974 Volume 1974 Issue 1 Pages 178-184
It has been found that the polymer aggregates (emulsion particles) were formed in the region of the particular degree of neutralization when ethylenediamine was added to aqueous polyacrylic acid solution. Then its mechanism was studied by the use of turbidity, viscosity and conductivity measurements. The results obtained were as follows. 1) The viscosity of polyacrylic acid-ethylenediamine was much lower than that of poly(acrylic acid)-n-butylamine and curves of the viscosity vs. degree of neutralization showed the maximum and mium values.2) lt was proved by measuring the conductivity of system that ethylenediamine was adsorbed by polyacrylic acid. 3) ln a copolymer bf acrylic acid and ethylacrylate, the turbid region decreased with increasing mole ratio of ethylacrylate, and emulsion particles were not formed more than 10 mol%. 4) With amines other than ethylenediamine, polyL-valent amines such as diethylenetriamine and triethy1enetetramine which had the ethylene segments only formed the emulsion particles inaqueous polyacrylic acid solution.
From these results, it was concluded that emulsion particles were formed due to the hydrophobic property of polyacrylicacid caused by the following mechanism: Ethylenediamine molecules were combined with the neighboring earboxyl groups by an ionic reaetion and then the ethylene segment of ethylenediamine molecules arranged appropriately along the main chainofpoly(acrylie acid).
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