Russian Journal of Applied Chemistry, 2013, Vol. 86, No. 1, pp. 87−91.
Pleiades Publishing, Ltd., 2013.
Original Russian Text © P.V. Kornienko, K.V. Shirshin, Yu.P. Gorelov, 2013, published in Zhurnal Prikladnoi Khimii, 2013, Vol. 86, No. 1, pp. 96−100.
AND POLYMERIC MATERIALS
Preparation and Properties of Foamed Materials Based
on Acrylonitrile–Methacrylic Acid Copolymers
P. V. Kornienko, K. V. Shirshin, and Yu. P. Gorelov
Kargin Research Institute of Polymer Chemistry and Technology with Pilot Plant, Dzerzhinsk,
Nizhni Novgorod oblast, Russia
Received March 30, 2012
Abstract—The physicomechanical properties of foamed polymethacrylimides formed by heat treatment of
acrylonitrile–methacrylic acid copolymers were studied in relation to the kind of the foaming agent and to the
concentrations of the foaming agent and acrylamide.
Owing to such unique properties as high strength and
heat resistance, foamed polymethacrylimides (PMIs)
are used in fabrication of body parts of planes, coaches,
cars, and boats, and also of helicopter blades and engine
deﬂ ectors [1, 2]. These foamed polymers are formed by
imidization involving acid and nitrile moieties of the
corresponding copolymers  in the presence of blow-
Such polymers are not commercially produced in
Russia. In other countries, the only intermediates used
for preparing PMIs are copolymers of methacrylonitrile
(MAN) and methacrylic acid (MAA) [4, 5]. However,
from the economical viewpoint, it seems appropriate to
replace MAN by acrylonitrile (AN), which is a readily
available large-tonnage commercial monomer.
The goal of this study was to prepare PMI from AN and
MAA in the presence of various modifying components
and to examine the effect of these components on the
physicomechanical characteristics of the foamed plastics.
Prior to use, AN, MAA, tert-butyl alcohol (TBA),
methylformamide (MF), and dimethylformamide (DMF)
were puriﬁ ed by distillation. Acrylamide (АА; Aldrich)
and the initiator, di(4-tert-butylcyclohexyl) peroxydicar-
bonate (Perkadox 16; AkzoNobel), were used without
additional puriﬁ cation.
The foamed material was prepared in two steps. In
rst step, AN–MAA copolymers were prepared by
polymerization in the bulk in silicate glass molds in the
presence of 0.2 wt % Perkadox-16 at 30°С. After 20 h,
R = H, CH