ISSN 1070-4272, Russian Journal of Applied Chemistry, 2006, Vol. 79, No. 11, pp. 1879!1883. C Pleiades Publishing, Inc., 2006.
Original Russian Text C S.S. Nikulin, O.N. Chernykh, 2006, published in Zhurnal Prikladnoi Khimii, 2006, Vol. 79, No. 11, pp. 1900 !1905.
AND POLYMERIC MATERIALS
Modification of Styrene-Containing Polymer with Pinane.
Possible Applications of the Product
S. S. Nikulin and O. N. Chernykh
Voronezh State Forestry Engineering Academy, Voronezh, Russia
Received March 24, 2006
Abstract-The influence of high-temperature treatment on the properties of a styrene-containing polymer
prepared from by-products of polybutadiene production was studied. The use of the products in production
of emulsion rubbers and for protecting treatment of wood materials was examined.
Polymers prepared by emulsion (co)polymerization
occupy a prominent place in world industry [13 4].
Emulsion polymerization does not require hazardous,
inflammable, and explosive organic solvents and
yields polymers with good physicomechanical proper-
ties. Studies are continued to improve the process for
production of polymers by emulsion (co)polymeriza-
tion and to extend the assortment of these polymers.
Polymers can be prepared in a high yield by (co)-
polymerization of wastes and by-products of petro-
chemical industry with styrene in a solution or in
the bulk in the presence of both ionic and radical ini-
tiators [5, 6]. Hence, preparation of artificial aqueous
dispersions of these polymers is promising. This
procedure is based on fine mechanical dispersion of
a polymer in an aqueous phase containing surfactants
as stabilizers. Then the solvent is distilled off and
the resulting dispersion is introduced into a latex. The
possibility of such modification was demonstrated
in [7, 8].
The substantial disadvantage of the process devel-
oped in our previous study [7, 8] is the use of a 503
70% hydrocarbon solution of the low-molecular
weight polymer for preparing dispersions. In this case,
an additional step, distillation of the hydrocarbon
solvent from the aqueous polymer dispersion, is re-
quired. Since the polymers prepared from petrochemi-
cal wastes are solid under the ordinary conditions,
a hydrocarbon solvent is required to prepare the
aqueous polymer dispersion. Hydrocarbon solvents
such as toluene, xylene, Nefras (commercial solvent
based on butylbenzene), etc. are used to dissolve these
polymers. This additional step complicates the process
and decreases its efficiency. In addition, the problem
of recovery and processing of these solvents arises. To
eliminate the use of a hydrocarbon solvent or to de-
crease its content in an aqueous polymer dispersion,
the molecular weight of the polymers should be de-
creased and solid polymers should be converted into
an oil. For this purpose, the polymers prepared from
wastes and by-products of petrochemical industry are
subjected to thermal oxidative treatment.
It this study we examined the influence of thermal
oxidative treatment in the presence of pinane hydro-
peroxide on the properties of a low-molecular-weight
styrene-containing polymer prepared from polybutadi-
ene production wastes. We also studied the possibility
of using the product as an additive to emulsion rubber
and for protecting treatment of wood materials.
First we determined the molecular weight of
styrene-containing low-molecular weight polymer
(SLMWP) treated at 100+ 2oC in the presence of
pinane hydroperoxide (PH). The thermal oxidative
treatment was performed by the following procedure.
A reactor equipped with a stirrer was charged with
100 g of a toluene solution of SLMWP containing
70375 wt % of bound styrene. PH in amount of 0, 1.0,
2.0, and 3.0 wt % of the initial SLMWP was added to
the solution with continuous stirring. The reaction
mixture was heated to 100+ 2oC. The total time of
the process was 30 h. Samples of the reaction mixture
were taken at regular intervals, their molecular weight
was measured viscometrically, and the acid
number was determined analytically. After treatment
completion, the solvent and other low-boiling frac-
tions were distilled off from the product.