1070-4272/03/7602-0303 $25.00 C 2003 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry, Vol. 76, No. 2, 2003, pp. 303!306. Translated from Zhurnal Prikladnoi Khimii, Vol. 76, No. 2, 2003,
Original Russian Text Copyright + 2003 by Sanatin, Levecheva, Savina, Boitsova, Volkova, Gorbunova.
AND POLYMERIC MATERIALS
Modification of Synthetic Latexes with Colloidal Silver
E. V. Sanatin, N. F. Levecheva, Yu. A. Savina,
T. B. Boitsova, E. I. Volkova, and V. V. Gorbunova
St. Petersburg State Technological Institute, St. Petersburg, Russia
Herzen State Educational University, St. Petersburg, Russia
Recived June 9, 2001; in final form, November, 2002
Abstract-Butadiene-styrene and acrylate latexes were studied as matrices for preparing colloidal silver.
Colloidal-chemical and strength properties of the modified latexes and Primal E1950 latex films were studied.
The heat resistance of these materials was determined.
Development of processes for producing new ma-
terials for electronics and medicine (e.g., antiseptic
applicators containing finely divided particles) is of
great scientific and practical importance [1!3]. The
published data on formation of colloidal metals in
a latex matrix are scarce [4, 5].
Since metal-containing elastomeric nanocomposites
cannot be prepared by direct mixing of a macromo-
lecular binder with finely divided metals, preparation
of these materials by a procedure involving generation
of colloidal metal in aqueous solution and coagulation
of latex rubber is a topical problem.
In this work we studied colloidal-chemical and
physicomechanical properties of latexes and latex films
modified with colloidal silver. This study was orga-
nized as follows: first we chose a procedure for pre-
paring finely divided metal in an aqueous solution,
then we performed this reaction in rubber latex, and
finally we determined colloidal-chemical, physico-
chemical, and thermal parameters of the composites.
Colloidal silver in a latex matrix was prepared by
a photochemical procedure that allows control of the
metal reduction in a matrix of any rigidity by varying
the irradiation time [6, 7].
The photolytes were prepared using AgNO
To choose the latex matrix, we analyzed the prop-
erties, first of all the colloidal-chemical behavior,
of various polymer dispersions. Special attention was
paid to the distribution of polymer particles in the dis-
We studied latexes of acrylate [Primal E1950
(Room & Haas), Acronal 271 (BASF), DMMA (Voro-
nezhsintezkauchuk)], butadiene-styrene [SB-278, SB-
139G, SB-852 (RHODIA), BS-75 (Voronezhsintez-
kauchuk)], and styrene-acrylate [GB-016, DL-430,
DS-910 (RHODIA)] polymers. All latexes were pre-
pared using anionic emulsifiers, presumably RSO
Na, where R = C
Since the system can be destabilized at high AgNO
concentrations , the amount of AgNO
into the latexes ranged from 0.17 to 1.7 wt %.
To prepare colloids in an aqueous medium, latex
(8 wt %) was mixed with an electrolyte (2 wt %)
with a definite AgNO
concentration. A latex film was
obtained from the resulting solution by the surface
renewal method . All the components of the system
were concentrated during drying and formation of the
The surface tension of the latex modified with the
electrolyte was determined with a Du-Nouy tensiom-
eter; the acidity of the dispersions, with a pH-154
pH meter; their viscosity, on a V3-4 orifice ;
the tensile strength of the films, on an RMI-5 tensile-
testing machine .
Dry modified films were irradiated with 254- and
365-nm light of UFO-254 and DRT-375 mercury
lamps. Formation of colloidal silver was deter-
mined spectrophotometrically (SF-46) from the rise
in the characteristic plasmon absorption in the range
Parameters of thermal oxidative degradation of
the polymers (temperature range of thermolysis, ac-