Russian Journal of Applied Chemistry, 2010, Vol. 83, No. 7, pp. 1309−1313.
Pleiades Publishing, Ltd., 2010.
Original Russian Text
N.V. Losev, I.M. Lipatova, 2010, published in Zhurnal Prikladnoi Khimii, 2010, Vol. 83, No. 7, pp. 1203−1207.
AND POLYMERIC MATERIALS
Prediction of the Dispersity of Starch Hydrogels
Prepared under Hydroacoustic Treatment
N. V. Losev and I. M. Lipatova
Institute of Solution Chemistry, Russian Academy of Sciences, Ivanovo, Russia
Received June 9, 2009
Abstract—The effect of shear stresses on the dispersion process in starch hydrogels under their treatment in
a rotary-pulse apparatus was examined.
Starch is used in various branches of industry for
preparing gelatinous auxiliary materials (thickeners,
adhesives, binders, dressing agents). Preparation of
gelatinous materials from starch involves thermal
breakdown of its primary structure formed by swollen
starch grains. These processes can be intensiﬁ ed by
hydroacoustic (HA) treatment performed in a rotary-
pulse apparatus (RPA), which allows the treatment time
and total power consumption to be considerably reduced
and the use of chemical or enzymatic cleaving agents to
The alternative mechanical procedure for cleavage
of starch hydrogels with RPA has already proved to be
efﬁ cient in industry, in particular, in textile industry in
production of starch sizing and thickening agents [1, 2].
In the mechanical procedure for preparing gelatinous
starch materials, the degree of degradation of their
structure should be optimal for a particular destination.
Wide use of technologies using hydroacoustic treatment
of sized starch is impeded by insufﬁ ciency of theoretical
basis and lack of reference experimental data for
predicting the results and improving the controllability
of the processes.
The energy aspects of the operation of hydroacoustic
apparatuses are considered in numerous papers.
Mathematical expressions correlating the energy
characteristics of the apparatuses with their design
parameters have been deduced. However, these papers
do not consider speciﬁ c functions of the apparatuses
and properties of speciﬁ c ﬂ uid media that can be treated
in these apparatuses [3, 4]. In energy calculations,
which should precede designing of such apparatuses,
it is necessary to take into account the properties and
structural features of the speciﬁ c medium being treated
and to have experimental data on the resistance of
particles to be broken down to mechanical actions.
The goal of this study was to obtain and analyze
experimental data with the aim to elucidate how the
characteristics of the initial starch hydrogels and
parameters of hydroacoustic treatment used for their
cleavage affect the particle size of the colloidal-dispersed
phase of the treated material.
Experiments were performed with popcorn starch,
GOST (State Strandard) 7697–82. Starch hydrogels
were prepared by cooking of a starch suspension on
a water bath at 90°С for 15 min.
Starch hydrogels were processed in a laboratory
rotary-pulse apparatus in the recycling mode. The
temperature-controlled working chamber of the
apparatus is formed by a rotor and a stator whose
cylindrical rings have rectangular channels. The rotor
rotation is accompanied by rapid alternation of the
alignment and misalignment of the rotor and stator