Russian Journal of Applied Chemistry, 2013, Vol. 86, No. 4, pp. 599−602.
Pleiades Publishing, Ltd., 2013.
Original Russian Text © V.M. Popov, S.S. Nikulin, A.V. Latynin, M.A. Shendrikov, 2013, published in Zhurnal Prikladnoi Khimii, 2013, Vol. 86, No. 4, pp. 643−646.
Mechanism by Which Electric Field Affects
the Strength of Glue Joints
V. M. Popov
, S. S. Nikulin
, A. V. Latynin
, and M. A. Shendrikov
Voronezh State Forestry Academy, Voronezh, Russia
Voronezh State Technological Academy, Voronezh, Russia
Received December 12, 2012
Abstract—Reason for the increase in the strength of glue joints under the action of an electric ﬁ eld on glue
components was studied.
In recent years, glues based on synthetic
macromolecular compounds have been gaining
increasing importance in many ﬁ elds of technology
[1, 2]. It is known that  that one of the main glue
quality criteria is the strength of a joint based on an
adhesive. To create higher strength glue joints, new
brands of adhesives are being developed and gluing
techniques are being improved. However, the presently
used technological procedures have become poorly
efﬁ cient and fail to satisfy modern requirements to
glued structures, especially to those operating under
high mechanical loads.
With consideration for results of studies concerned
with modiﬁ cation of polymeric materials by treating
a melted polymer with physical ﬁ elds , it would be
expected that the strength of glue joints subjected to a
treatment with, in particular, an electric ﬁ eld should also
The goal of our study was to examine the inﬂ uence
exerted by an electric ﬁ eld on the structure of the
polymeric component of a glue, which determines the
cohesion strength of glue layers in joints.
To treat the melted polymeric component of a
glue with an electric ﬁ eld, we used an installation 
comprising a high-voltage rectiﬁ er, capacitor bank,
resistance box, and working cell with a ﬂ uoroplastic
cuvette. The installation can create in the working cell
an electric ﬁ eld with strengths of up to 2000 V cm–1.
The cell has a built-in heater creating a prescribed
temperature of the polymer melt in the cuvette. The
treatment duration did not exceed 20 min. Then the
treated polymeric component was mixed with a curing
agent. The electrically treated glue formulation was
applied to the surface of samples for strength tests. The
samples were joined and kept under a pressure of 0.2
MPa in a drying box at a prescribed temperature until
complete curing of the adhesive layer. We used standard
plates of St.20 steel  and oak wood . The samples
were tested on an IR-50-3 machine for the ultimate
shear strength for steel samples and ultimate split
strength for wood along ﬁ bers. Tests were performed for
two-component glues of KFZh [GOST (State Standard)
14231–88] and Kleiberit Supraterm 436 (aqueous
polyurethane dispersion) brands in gluing of wood and
K-153 [TU (Technical Speciﬁ cation) 6-05-1584–86]
and VK-9 (TU 1-595-14-842–2004) brands for steel.
It follows from the data in the table that, for all of
the glues under study, raising the electric ﬁ eld strength
improves the strength of a glued joint. The strength
grows particularly strongly for joints based on Kleiberit
Supraterm 436 polyurethane glue.