ISSN 1070-4272, Russian Journal of Applied Chemistry, 2015, Vol. 88, No. 11, pp. 1788−1792. © Pleiades Publishing, Ltd., 2015.
Original Russian Text © E.Yu. Rosova, N.G. Belnikevich, Z.F. Zoolshoev, N.N. Saprykin, G.K. Elyashevich, 2015, published in Zhurnal Prikladnoi Khimii, 2015,
Vol. 88, No. 11, pp. 1573−1578.
AND POLYMERIC MATERIALS
New Polyaniline/Chitosan Composite Systems:
Synthesis, Structure, and Functional Properties
E. Yu. Rosova, N. G. Belnikevich, Z. F. Zoolshoev, N. N. Saprykina and G. K. Elyashevich
Institute of Macromolecular Compounds, Russian Academy of Sciences, Bol’shoi pr. 31, St. Petersburg, 199004 Russia
Received November 12, 2015
Abstract—Electroconductive and mechanically strength composite systems based on polyaniline and chitosan
on the polyethylene porous substrate were obtained. A method to synthesize the conductive form of polyaniline
in the solution of chitosan was developed. Molecular characteristics of chitosan in the solutions of acetic and
hydrochloric acids and in their mixtures have been investigated. Optimal composition of solvent for the synthesis
of polyaniline in a chitosan solution was determined. Electrical conductivity and mechanical characteristics of
polyaniline/chitosan composite systems on porous polyethylene ﬁ lm were measured.
Recently a great attention has been attracted by
analytical devices, so called biosensors, making it
possible to quantitatively determine the presence of
speciﬁ c structures and molecules in biological liquids
under study. A problem of obtaining water-insoluble
ﬁ lm selective materials which are used as bio-sensitive
elements of sensor analyzers is urgent in the process of
manufacturing these devices.
Chitosan is rather widely used in biosensors
production owing to its nontoxicity, biocompability,
biodegradability, high sorptive capacity, selectivity, and
also ability to ﬁ lm formation [1, 2]. Moreover, chitosan
can be used as a matrix polymer for the introduction of
polymer and non-polymer bio-sensitive components.
Electroconductive polymers, particularly polyaniline
(PANI), are promising as biosensors components due
to ability to function as electric current transducers
and to sorb various biological objects without losing
electroactivity. However these polymers have a limited
biocompability and low ability to ﬁ lm or ﬁ ber formation.
In this regard, the possibility to use chitosan as a matrix
polymer for polyaniline synthesis is a rather interesting
and actual problem as it would allow obtaining chitosan-
PANI composite system combining electroconductivity
Polyaniline in active electroconductive form can
be synthesized only in acidic media within pH = 1–2.
Chitosan ﬁ bers and ﬁ lms are usually obtained in weak
acid aqueous solvents, with acetic acid solutions most
frequently used [3–5]. In literature there have been
the reports concerning the investigations of chitosan
solutions in strong acids (particularly in hydrochloric
acid), however the opinions of the authors regarding
the inﬂ uence of solvent on chitosan macromolecular
characteristics in these solutions signiﬁ cantly differ [6–8].
At present, there are no published data on preparation
and properties of chitosan ﬁ lms cast from HCl solutions.
The aim of this work was to develop a method for
polyaniline synthesis in chitosan solution and to obtain
electroconductive ﬁ lm composites containing chitosan/
PANI system as an active element formed on mechanically
strength elastic polyethylene substrate.
Chitosan purchased from Aldrich Chemical Com-
pany, Inc. (USA) with М
= 2.5 × 10
and the degree of
deacetylation 0.75–0.85 was used.
Solvents for chitosan were prepared from glacial
acetic acid (chemically pure) an HCl volumetric ﬁ xanals.