1070-4272/04/7710-1693 C 2004 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry, Vol. 77, No. 10, 2004, pp. 1693!1698. Translated from Zhurnal Prikladnoi Khimii, Vol. 77, No. 10, 2004,
Original Russian Text Copyright + 2004 by Lirova, Lyutikova, Degtyareva, Larionov, Degtyarev, Berkuta.
AND POLYMERIC MATERIALS
Properties of a Film Material Based on Polyvinyl Chloride
as Influenced by the Plasticizer
B. I. Lirova, E. A. Lyutikova, A. N. Degtyareva, V. A. Larionov,
S. I. Degtyarev, and B. A. Berkuta
Gor’kii Ural State University, Yekaterinburg, Russia
Stroiplastpolimer Joint-Stock Company, Yekaterinburg, Russia
Received July 23, 2004
Abstract-The behavior of a film material based on polyvinyl chloride in air and aqueous media, as influenced
by individual plasticizers and their binary mixtures, was studied by gravimetry, thermogravimetry, and IR
spectroscopy. The effect of these factors on the frost resistance and other physicochemical properties of
the films was studied.
Polymer films based on polyvinyl chloride (PVC)
with a one-side adhesive layer are used for water-
proofing and corrosion protection of oil, gas, and ma-
terial pipelines [1, 2]. These films necessarily contain
plasticizers and other low-molecular-weight additives,
which can pass into air or wet soil during operation.
The decrease in the plasticizer content can deteriorate
the physicochemical properties and frost resistance of
the polymer material [3, 4] and increase its cracking;
as a result, the films can lose continuity and, hence,
protecting properties. Water sorption is an important
characteristic of a polymeric material operating in
a moist environment. Small water sorption reduces
the sensitivity of the polymer material to freezing-de-
frosting cycles typical of the Russian climate and fa-
vors preservation of its protecting properties.
One of procedures for preparing a polymeric mate-
rial with required properties is its plasticization with
a plasticizer mixture [3, 5]. The aim of this study
was to improve the frost resistance of a PVC film for
production of tapes with an adhesive layer by using
mixtures of plasticizers of varied nature and to exam-
ine their behavior in air and aqueous media. We stud-
ied PVC films plasticized with individual plasticizers
[di(2-ethylhexyl)-o-phthalate (DOP), dibutoxyethyl
adipate (DBEA), dibutyl sebacate (DBS)] and their
mixtures. Di(2-ethylhexyl)-o-phthalate is the common
PVC plasticizer, whereas DBEA and DBS containing
no aromatic groups, were used to improve the frost
resistance of the films [3, 6].
We studied plasticized PVC films with 100 : 45
PVC3plasticizer weight ratios, used in production
of tapes with an adhesive layer. These formulations
were prepared from industrial components: S-70 brand
suspension PVC and DOP, DBEA, and DBS plasti-
cizers. All the formulations contained talc as a filler
and BAC-S-20 as a stabilizer.
The films were prepared by rolling on a laboratory
masticating mill at 140oC for 10 min. The film thick-
ness was about 0.3 mm. The samples were studied
approximately three months after their preparation.
In this study, we determined the composition of
compounds released from the film into air and aque-
ous media under various operation conditions.
The weight loss by the samples in air at normal
atmospheric pressure was studied by gravimetry un-
der the isothermal conditions at 90oC. The thermal
analysis was performed in air on an MOM Q-1500
derivatograph (Hungary) in the 253300oC temperature
range at a heating rate of 10 deg min
, with Al
as a reference.
The qualitative composition of the compounds re-
leased from the films into air and the kinetics of their
liberation at 90oC under a dynamic vacuum (residual
pressure ~30 Pa) were studied by IR spectroscopy in
a heated vacuum cell . In this procedure, a sample
was placed on the bottom of the temperature-controlled