Russian Journal of Applied Chemistry, 2009, Vol. 82, No. 2, pp. 323−327.
Pleiades Publishing, Ltd., 2009.
Original Russian Text
M.S. Salakhov, V.S. Umaeva, A.I. Alikhanova, 2009, published in Zhurnal Prikladnoi Khimii, 2009, Vol. 82, No. 2, pp. 329−333.
AND POLYMERIC MATERIALS
Synthesis of Stereospeciﬁ c Hinged Ladder Polyimides
by Diels–Alder Reaction
M. S. Salakhov, V. S. Umaeva, and A. I. Alikhanova
Institute of Polymer Materials, National Academy of Sciences of Azerbaidjan, Sumgaiyt, Azerbaidjan
Received December 12, 2007
Abstract—A one-stage synthesis of hinge-ladder polyimides by Diels−Alder poly-condensation of polychlorinated
cyclic bisimidodienes with bismaleimides containing aromatic and aliphatic groups was studied.
We know many methods of polyimide synthesis
 however they are based mainly on the two-stage
procedures  when the second stage is performed by
the thermal way providing difﬁ culties at determination
of a dependence of a structure of amide fragments on
polyimide properties. Besides the hinged polyimides
obtained by the known methods do not possesses 100%
imidization due to an incomplete conversion of the chain
links of polyimide acids [1–3].
Polymerization by Diels–Alder (DA) reaction is one
of promising trends in the preparation of polyimides of
varios structures that promotes wide modiﬁ cation of the
chemical composition and properties of the polyimides
since both dienes of a cyclic structure and dienes with
open chain can be applied to the reaction. In this case
a bis-imide of unsaturated cyclic dicarboxylic acid,
bis-maleimide, should be used as dienoﬁ l component.
The synthesis of a polyimide (A) via DA polycondensa-
tion of bis-cyclopentadiene with N,N'-(hexamethylene)bis-
maleimide is reported in  (Scheme 1), and bis-fulvene
with bis-maleimide in DMF at 60–70°С according
to Scheme 2 resulted in polyimide (B) preparation as
described in .
DA polymerization is important at designing oriented
ladder molecules. However available studies in this
ﬁ eld do not make clear the idea of a spatial structure