ISSN 1070-4272, Russian Journal of Applied Chemistry, 2014, Vol. 87, No. 12, pp. 1901−1907. © Pleiades Publishing, Ltd., 2014.
Original Russian Text © E.S. Kuksenko, M.L. Kerber, L.S. Shibryaeva, S.N. Filatov, B.M. Prudskov, I.Yu. Gorbunova, 2014, published in Zhurnal Prikladnoi
Khimii, 2014, Vol. 87, No. 12, pp. 1828−1835.
AND POLYMERIC MATERIALS
Effect of Oxidation and Modiﬁ ers on Polypropylene
E. S. Kuksenko
, M. L. Kerber
, L. S. Shibryaeva
, S. N. Filatov
B. M. Prudskov
, and I. Yu. Gorbunova
Mendeleev University of Chemical Technology, Miusovskaya pl. 9, Moscow, 125047 Russia
Emanuel’ Institute of Biochemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 119334 Russia
Received December 18, 2014
Abstract—The effect of ester modiﬁ ers [di-n-alkyl esters derived from o-phthalic acid and C
tions; poly(propylene glycol adipate) dibutyl ester] on the polypropylene oxidation and crystallization was studied.
The modiﬁ ers inﬂ uence the size of the crystallization nuclei and the polypropylene crystallization rate. Various
models were used for mathematical description of the process, of which the Avrami model appeared to be the most
adequate. The ester modiﬁ ers strongly inﬂ uence the resistance of polypropylene to thermal oxidation: introduction
of poly(propylene glycol adipate) dibutyl ester, thermodynamically incompatible with polypropylene, leads to a
considerable increase in the induction period of oxidation.
Polypropylene (PP) is a large-tonnage polymer
produced by numerous companies throughout the world.
Many grades with diverse combinations of properties are
produced, but constantly expanding applications of this
readily available polymer in many branches of economy
pose new requirements upon this material.
The most important pathways for modiﬁ cation of
PP properties are its copolymerization with various
monomers (α-oleﬁ ns, norbornene, methylpentene, etc.),
blending with other polymers (polyethylene, rubbers,
thermoelastoplastics), and introduction of various kinds
of nanoparticles. Introduction of plasticizers differing
in the compatibility with PP is also widely used for
modiﬁ cation. The use of plasticizers allows enhancement
of the resistance of the material to frost and repeated
bending and improvement of its transparence.
It is known that relatively low oxidation resistance is
one of PP drawbacks. In , using IR spectroscopy, we
studied the behavior of isotactic PP containing oligoester
plasticizers under the conditions of oxidation at 130°С.
The introduced additives, along with the enhancement of
the oxidation resistance, inﬂ uence the course of polymer
crystallization processes, thus altering its degree of
crystallinity and supramolecular structure.
This study was aimed at enhancing the resistance
of polypropylene to thermal oxidative degradation. For
this purpose, we examined the inﬂ uence of oligomeric
modiﬁ ers on the resistance of polypropylene to thermal
oxidative degradation and on changes in its structure in
the course of oxidation.
The investigation object was polypropylene of grade
01003, produced under trade name Kaplen. The starting
polymer is designated as PPn. As modiﬁ ers we used
poly(propylene glycol adipate) dibutyl ester (PPA-4)
and di-n-alkyl o-phthalates derived from C–C
The DAP concentration was varied from 3 to 10
wt %, and the PPA-4 concentration was 1 wt %. To
prevent the thermal oxidative degradation, we introduced