Russian Journal of Applied Chemistry, 2011, Vol. 84, No. 7, pp. 1271−1275.
Pleiades Publishing, Ltd., 2011.
Original Russian Text © A.B. Glazyrin, M.I. Abdullin, B.U. Salikhov, 2011, published in Zhurnal Prikladnoi Khimii, 2011, Vol. 84, No. 7, pp. 1201−1205.
AND POLYMERIC MATERIALS
Effect of 1,2-Polybutadienes on Properties of Plasticized
A. B. Glazyrin, M. I. Abdullin, and B. U. Salikhov
Bashkir State University, Ufa, Bashkortostan, Russia
Received January 21, 2011
Abstract—The effect of 1,2-polybutadienes of various molecular weights and structures on the rheological
and physicomechanical properties and on the heat resistance of plasticized polyvinyl chloride was studied. The
possibility of using 1,2-polybutadienes as modifying components of polyvinyl chloride compounds, improving
their processability and enhancing their heat resistance, was examined.
One of the ways to prepare polymeric compounds
and materials with a deﬁ nite set of valuable properties is
introduction of special modifying additives. In produc-
tion of polyvinyl chloride (PVC) materials and items,
a large set of modifying additives of various functional
destinations are used. They are introduced into the poly-
meric formulation in deﬁ nite amounts depending on the
material destination and requirements to its properties
[1–3]. Among modiﬁ ers improving the processing condi-
tions and service characteristics of PVC compounds are
such commercial products as butadiene–nitrile rubber,
low-molecular-weight polyethylene, chlorinated and
chlorosulfonated polyethylene, and polyacrylates [4–11].
It is promising to use in PVC compounds
thermoelastoplastics, i.e., polymers that combine
high elasticity with the capability for transition
into the viscous-flow state at elevated temperatures
similarly to thermoplastic polymers. Among such
polymers is syndiotactic 1,2-polybutadiene prepared by
stereospeciﬁ c polymerization of butadiene in solution.
This thermoelastoplastic is characterized by a good set
of physicomechanical properties and high dielectric
characteristics, and its melts have relatively low viscosity
[12, 13]. Combination of these properties determines the
possibility of using syndiotactic 1,2-polybutadiene for
modiﬁ cation of polymeric compounds prepared from
both thermoplastics and elastomers.
In this study we examined the effect of 1,2-poly-
butadienes on the rheological and physicomechanical
properties and on the heat resistance of plasticized PVC
and assessed the possibility of using 1,2-polybutadienes
for modiﬁ cation of PVC compounds.
We used 1,2-polybutadienes differing in the molecular
weight and structure of macromolecules: high-molecular-
weight syndiotactic 1,2-polybutadiene (SPB) of molecular
= 52.6 × 10
= 2.22, containing 85%
1,2-polymerization units in the chain, with the degree
of syndiotacticity of 53%, melting point Т
glass transition point Т
= –18°С, and the degree of
crystallinity of 18%; and low-molecular-weight atactic
1,2-polybutadiene (APB) of molecular weight М
8.35 × 10
, with the degree of polydispersity of 1.98 and
70.5% content of 1,2-units in the macromolecule, which
was a viscous resin-like product with the drop point of
1,2-Polybutadienes were introduced in an amount
of 0.5–6.0 wt parts per 100 wt parts of PVC into the
following formulation (wt parts): PVC S7059 100,
stabilizer (tribasic lead sulfate, TBLS) 2, and plasticizer