1070-4272/04/7704-0688 C 2004 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry, Vol. 77, No. 4, 2004, pp. 688!690. Translated from Zhurnal Prikladnoi Khimii, Vol. 77, No. 4, 2004,
Original Russian Text Copyright + 2004 by Klimets, Grinyuk, Krul’.
Rheological and Adhesion Properties
of Aqueous Solutions of Corn Dextrin
T. G. Klimets, E. V. Grinyuk, and L. P. Krul’
Research Institute of Physicochemical Problems, Belarussian State University, Minsk, Belarus
Received October 17, 2003; in final form, January 2004
Abstract-Rheological and adhesion properties of aqueous solutions of corn dextrin at widely varied con-
centrations, obtained at different mixing temperatures, were studied.
Aqueous solutions of natural polysaccharides
(ASPs), especially starch and its derivatives, such as,
e.g., dextrin, are widely used as adhesives . Dextrin
adhesives find extensive application for gluing paper
and paper labels .
Despite the wide use of aqueous solutions of dex-
trin as adhesives, there are virtually no published data
on their rheological and adhesion properties, which
specifically determine the main process characteristics
of adhesives. Preparation of dextrin glues consists in
heating a dextrin3water mixture or in dissolving dex-
trin in hot water . These operations resemble the
pasting stage in preparation of starch paste , How-
ever, there are no published data on how pasting af-
fects the rheological and adhesion characteristics of
The aim of this study was to examine the rheolog-
ical and adhesion properties of solutions of corn dex-
trin (CD) of different concentrations, prepared in hot
and, for comparison, in room-temperature water.
We studied aqueous solutions of acidic corn dex-
trin, GOST (State Standard) 6034374. The solutions
were prepared at room temperature or at 65 + 5oC
under continuous stirring for 30 min. The concentra-
tion of the solutions was varied from 15 to 70%.
The viscosity of the resulting solutions was mea-
sured on a Rheotest 2 rotary viscometer with a coax-
ial-cylinder working unit at 20 + 0.1oC.
The adhesive properties of ASPs in the glass3ad-
hesive3paper system were studied in an RMU-0.05.-1
tensile-testing machine with the stress measurement
range (0310) + 0.02 kgf and the rates of motion of
the guide rod of the machine from 0 to 100 mm min
To keep the glass surface at a constant temperature,
we placed it in a metallic flow-through cell whose
dimensions were adjusted to those of the glass shell,
a fragment of a bottle.
As substrate served samples of KYMULTRA
COPY writing paper, A4, 80 g m
3500, which were
cut into 150 0 10 mm strips. A 100-mm long adhe-
sive layer was manually applied to each strip. The
samples were glued to the surface of the bottle frag-
ment kept at 20 + 0.5oC. The free end of the strip
was fixed in the stationary clamp of the tensile mach-
Figure 1 presents the log-log flow curves for aque-
ous solutions of dextrin with different concentrations,
prepared by mixing at room temperature. Figure 1a
shows that all the aqueous solutions of CD, studied
by us, are non-Newtonian liquids. The pseudoplastici-
ty is the most pronounced in the case of 50370% so-
lutions (Fig. 1a, curves 43 6).
Figure 1b shows the flow curves for the same
solutions prepared by mixing at 65 + 5oC. It is seen
that pseudoplasticity is characteristic of only 50370%
CD solutions, and 15330% solutions are virtually
Newtonian liquids (Fig. 1b, curves 436 and 133, re-
Comparison of the results shows that, at low shear
), the CD solutions obtained at
65 + 5oC are less viscous than those obtained at room
temperature, while at high shear rates (48.631312 s
this difference is partly eliminated. Also, heating
yields less pseudoplastic solutions.