ISSN 1070-4272, Russian Journal of Applied Chemistry, 2014, Vol. 87, No. 2, pp. 224−229. © Pleiades Publishing, Ltd., 2014.
Original Russian Text © L.L. Semenycheva, E.V. Geras’kina, O.A. Kazantsev, A.P. Sivokhin, A.A. Moikin, 2014, published in Zhurnal Prikladnoi Khimii, 2014,
Vol. 87, No. 2, pp. 244−249.
AND POLYMERIC MATERIALS
Inﬂ uence of the Molecular Weight on the Properties of Alkyl
Methacrylate–Vinyl Butyl Ether Copolymers as Thickening
Additives to Petroleum Oils
L. L. Semenycheva
, E. V. Geras’kina
, O. A. Kazantsev
, A. P. Sivokhin
, and A. A. Moikin
Lobachevsky Nizhni Novgorod State University, pr. Gagarina 23, Nizhni Novgorod, 603950 Russia
Alekseev Nizhni Novgorod State Technical University, ul. Minina 24, Nizhni Novgorod, 603950 Russia
Received January 20, 2014
Abstract—Copolymers of alkyl methacrylates with vinyl butyl ether were prepared by gradual addition of the
active monomer to the inactive monomer. The resistance of these copolymers to mechanical degradation and their
thickening power in petroleum oils were studied in comparison with those of the polyalkyl methacrylates used
in industry. The inﬂ uence of the molecular weight of the copolymers on the above characteristics was examined.
The alkyl methacrylate–vinyl butyl ether copolymers exhibit enhanced resistance to mechanical degradation in
a petroleum oil solution.
Polymeric additives are widely used as thickeners
for mineral (petroleum) and synthetic oils [1, 2]. One
of the main characteristics of such additives is their
resistance to heating and mechanical loads. Polyalkyl
methacrylates (PMAs) are widely used as oil thicken-
ers. Vinyl n-butyl ether homopolymers of various mo-
lecular weights (MWs) are also used as thickening addi-
tives (Vinipol VB-2, Vinipol VB-3) along with polyalkyl
methacrylates . However, being effective as thicken-
ers, the above polymers exhibit low resistance to thermal
and mechanical degradation [2, 3]. To enhance the resis-
tance of polyalkyl methacrylate thickening additives to
heat and mechanical action, it is suggested to introduce
into the polymer chain units of acrylonitrile , styrene
[3–5], α-oleﬁ ns С
[6, 7], maleic anhydride , di-
cyclopentadiene , indene , tetradecene , о-al-
lylphenol , maleimide, N-vinylpyrrolidone, N-vinyl-
imidazole , and other comonomers. In [14–16], we
suggested using various copolymers of alkyl methacry-
lates with vinyl n-butyl (VBE) or vinyl isobutyl ether as
thickening additives to mineral and synthetic oils.
This work is aimed to study additives based on
alkyl methacrylate (AMA)–VBE copolymers
and to reveal the inﬂ uence of their molecular weight
on the thickening power and resistance to mechanical
degradation in a mineral base (I-20A industrial oil).
Commercial thickening additives PMA V-1 and PMA
V-2 (contain PMA with alkyl groups, mainly C
PMA D additive increasing the viscosity and decreasing
the congelation point (contains PMA with С
groups), and PMA samples of various compositions and
molecular weights, synthesized in a laboratory, were
taken for comparison.
In our study we used commercial samples of VBE
alkyl methacrylates, lauryl acrylate (LA)
and lauryl methacrylate (LMA) from Aldrich, and decyl
methacrylate (DMA) synthesized as described in .
Copolymers of C
AMAs with VBE (CMAs) were
synthesized using azobis(isobutyronitrile) (AIBN)
as radical polymerization initiator and following the
previously suggested procedure [14–16] allowing
preparation of polymers with close content of weakly
active VBE and highly active AMA and with predominant
alternation of the comonomer units.