ISSN 1070-4272, Russian Journal of Applied Chemistry, 2007, Vol. 80, No. 2, pp. 295!299. + Pleiades Publishing, Ltd., 2007.
Original Russian Text + V.P. Lesnyak, D.I. Shiman, L.V. Gaponik, F.N. Kaputskii, A.I. Lamotkin, Zh.V. Bondarenko, 2007, published in Zhurnal
Prikladnoi Khimii, 2007, Vol. 80, No. 2, pp. 296!300.
AND POLYMERIC MATERIALS
Copolymers of the C
of Liquid Pyrolysis Products with Maleic Anhydride
and Their Esterification Products as Additives to Paper Pulp
V. P. Lesnyak, D. I. Shiman, L. V. Gaponik, F. N. Kaputskii,
A. I. Lamotkin, and Zh. V. Bondarenko
Institute of Physicochemical Problems, Belarussian State University, Minsk, Belarus
Belarussian State Technological University, Minsk, Belarus
Received October 23, 2006
Abstract-The influence exerted by copolymers of the C
fraction of liquid pyrolysis products of petroleum
raw materials with maleic anhydride and by their esterification products, added to paper pulp, on the main
paper properties was examined.
Sizing of paper pulp is one of important steps in
production of sized kinds of paper; it allows control
over the hydrophobic properties of the product. Present-
ly sizing is performed in an acidic medium by adding
a sizing emulsion (or dispersion) and a coagulant so-
lution to the paper pulp, after which the paper sheet is
formed on the frame of the paper-making machine .
The most commonly used sizing materials are rosin
and products of its modification. However, active
efforts are made today to develop synthetic sizing
materials that would not only allow the characteris-
tics of sized paper to be varied in a wider range, but
also impart to the paper some specific properties that
cannot be imparted by rosin sizing. In particular, poly-
meric adhesives enhance the mechanical strength of
paper  and the resistance of its surface to picking,
inhibit its aging , enhance its acid and alkali re-
sistance , and improve its printing properties .
Furthermore, polymeric adhesives do not absorb UV
radiation in the range 3503370 nm and thus do not
decrease the efficiency of optical brighteners .
The copolymer of maleic anhydride (MA) with
styrene (Styromal) and products of its esterification
have been fairly well studied and tested as synthetic
additives in paper production. Along with styrene3
MA copolymers, polymers containing units of acrylic
acid, its esters, or acrylonitrile are also used for pre-
paring synthetic adhesives. Copolymers of styrene
with MA are classed with nonreactive anionic synthet-
ic sizing materials, despite that they exhibit no siz-
ing effect when taken alone and can be used only in
a mixture with a rosin adhesive . Therefore, it
would be more adequate to consider such products
as modifying additives.
As an analog of Styromal, we tested as an additive
to paper pulp the copolymer of MA with C
carbon fraction of liquid pyrolysis products (CPM)
whose main polymerizable components are styrene, its
derivatives, and dicyclopentadiene.
The goal of this study was to examine the effect
of additions of CPMs and their ester derivatives on
the hydrophobic, strength, and special properties of
It is known that nonreactive synthetic sizing ma-
terials and, in particular, polymeric adhesives, do not
form strong chemical bonds with cellulose fibers .
The effect of paper sizing is based on the mechanism
of fixation of coagulated particles on the fiber sur-
face via adsorption-electrostatic interactions, similar
to the mechanism of sizing with rosin products .
Therefore, we compared the properties of paper with
CPM additions to those of the unsized paper and
paper sized with ZhM rosin adhesive (adhesive paste
from modified oleoresin rosin) in acidic medium
(pH 4.8 35.2). Because direct interaction of copoly-