Russian Journal of Applied Chemistry, 2012, Vol. 85, No. 7, pp. 1113−1117.
Pleiades Publishing, Ltd., 2012.
Original Russian Text © A.B. Glazyrin, M.I. Abdullin, A.V. Sidorov, 2012, published in Zhurnal Prikladnoi Khimii, 2012, Vol. 85, No. 7, pp. 1145−1150.
AND POLYMERIC MATERIALS
Thermal Degradation of Halogen Derivatives of Syndiotactic
A. B. Glazyrin, M. I. Abdullin, and A. V. Sidorov
Bashkir State University, Ufa, Bashkortostan, Russias
Received May 12, 2012
Abstract—Thermal degradation of halogen derivatives of syndiotactic 1,2-polybutadiene, differing in the kind of
the halogen, its content in the polymeric product, and its position in the monomeric unit, was studied by thermal
gravimetric analysis. Comparative evaluation of the heat resistance of the halogenated polymers under consider-
ation was made.
Halogenated polymers find wide use in various
branches of engineering owing to good complex of ser-
vice properties and combination of mechanical strength
and high dielectric characteristics with the resistance to
chemical reagents, oil, benzine, and ﬂ ame and with high
adhesion to metals [1–3].
An important characteristic of halogenated polymers
is their heat resistance determining the stability of poly-
meric materials and items in reprocessing and service at
The majority of halogenated polymers are character-
ized by relatively low heat resistance, which restricts their
application and requires using a complex of stabilizing
additives in formulations based on them [1, 3–5]. This fact
makes it necessary to look for new halogenated polymers
exhibiting good physicomechanical properties and high
heat resistance and to develop efﬁ cient methods for their
Among new halogenated polymers are halogen de-
rivatives of syndiotactic 1,2-polybutadiene (1,2-PB),
prepared by chemical modiﬁ cation of the polydiene and
containing chlorine or bromine atoms in the macromol-
ecules [6–9]. These polymeric products exhibit good
adhesion properties and are suggested as components of
adhesive formulations for production of adhesive PVC
tapes for various purposes [9–12], and also as modiﬁ ers
for PVC compounds, aimed to improve their rheological
properties in processing [6, 8]. At the same time, thermal
degradation of halogenated 1,2-polybutadienes remains
This study deals with thermal degradation of halogen
derivatives of syndiotactic 1,2-PB, differing in the kind
of the halogen, its content in the polymeric product, and
position of the halogen atom in the monomeric unit.
To prepare halogenated polymers, we used syndiotac-
tic 1,2-PB with the following characteristics: molecular
= 52.6 × 10
, polydispersity index 2.22,
content of 1,2-polymerization units 85% (the remaining
units are 1,4), degree of syndiotacticity 53%, crystallin-
ity 18%. The initial syndiotactic 1,2-PB was puriﬁ ed by
reprecipitation in the chloroform–ethanol system and
Chlorine derivatives of syndiotactic 1,2-PB were
prepared by bubbling of gaseous chlorine through a so-
lution of the polymer in chloroform at 10–20°С [6–8].
Bromination of 1,2-PB was performed by adding liquid