ISSN 1070-4272, Russian Journal of Applied Chemistry, 2007, Vol. 80, No. 2, pp. 305!310. C Pleiades Publishing, Ltd., 2007.
Original Russian Text C S.S. Nikulin, O.N. Filimonova, N.S. Nikulina, 2007, published in Zhurnal Prikladnoi Khimii, 2007, Vol. 80, No. 2, pp. 306 !311.
AND POLYMERIC MATERIALS
Modification with Maleic Acid of the Copolymer
from By-Products of Polybutadiene Production and Use
of the Modified Copolymer for Protective Treatment
of Wood Fiberboards
S. S. Nikulin, O. N. Filimonova, and N. S. Nikulina
Voronezh State Academy of Forestry Engineering, Voronezh, Russia
Received May 6, 2006
Abstract-Modification with maleic acid of a styrene-containing polymeric material prepared from by-
products of polybutadiene production was studied.
Many wastes from petrochemical enterprises, in-
cluding synthetic rubber plants, contain numerous
It is known that butadiene dimers and trimers, on
the one hand, are by-products in some petrochemical
processes involving butadiene and, on the other hand,
can be valuable raw materials for various organic and
petrochemical syntheses and for production of poly-
meric materials [1, 2]. A process for production of
styrene-containing low-molecular-weight polymeric
materials from these by-products has been commer-
cially implemented [3, 4]. However, the polymeric
materials thus obtained contain no functional groups,
which restricts their possible applications.
The problems of chemical modification of synthet-
ic polymers, rubber stocks, and vulcanizates are given
much attention today from both scientific and practi-
cal viewpoints. Introducing functional groups into
the copolymers and finding new fields of their ap-
plications are important problems.
In this study, we examined the possibility of using
for impregnation of wood materials a low-molecular-
weight copolymer prepared from unsaturated com-
pounds of recycled toluene distillation bottoms (TDB)
from polybutadiene production, modified with maleic
acid (MA). The interest in maleic acid as a modifying
agent is based on the fact that maleic acid is a by-
product in the production of phthalic and maleic an-
hydrides. Therefore, this process not only allows
modification of polymeric materials prepared from
by-products of polybutadiene production, with new
properties imparted to the resulting compounds, but
also provides utilization of production waste.
Maleic (cis-butenedioic) acid can be dehydrated
to obtain maleic anhydride. Maleic acid and its esters
readily isomerize into fumaric acid and its derivatives
under the action of heat, light, and catalysts. Maleic
acid is widely used for preparing various surfactants.
Certain amount of MA is used in food industry for
preparing tartaric acid .
We examined how the MA content of the reaction
mixture, temperature, and process duration affect
the properties of the styrene-containing polymeric
material based on unsaturated TDB (bound styrene
content 753 80 wt %).
The modification was performed as follows. A re-
actor was charged with 100 g of 70% toluene solution
of a low-molecular-weight styrene-containing poly-
meric material based on unsaturated TDB, and MA
was added in various ratios to the starting polymer.
The best modification conditions were determined by
using the method of experiment design. We examined
the effects of such factors as MA content, temperature,
and process duration using the 4 0 4 Latin square plan
. For each factor, we took four levels of variation:
factor A (MA dosage), 0, 3.0, 6.0, and 9.0 wt %;
factor B (process temperature), 120, 150, 180, and
210oC; and factor C (process duration), 8, 16, 24, and
32 h. The reaction progress was monitored by analyt-
ical methods from the variation of the mean molecular