ISSN 1070-4272, Russian Journal of Applied Chemistry, 2006, Vol. 79, No. 9, pp. 1559!1560. + Pleiades Publishing, Inc., 2006.
Original Russian Text + N.I. Polezhaeva, I.V. Polezhaeva, V.A. Levdanskii, V.A. Fedorov, 2006, published in Zhurnal Prikladnoi Khimii, 2006, Vol. 79,
No. 9, pp. 1575!1576.
Thermal Oxidative Degradation of a Composition Based
on a Polyester Resin and Tetramethylammonium Chloride
N. I. Polezhaeva, I. V. Polezhaeva, V. A. Levdanskii, and V. A. Fedorov
Sibirean State Technological University GOU VPO, Krasnoyarsk, Russia
Received March 10, 2006
Abstract-Thermal oxidative degradation of a composition based on a polyester resin modified with rosin and
tetramethylammonium chloride and its use as a flux for low-temperature solder pastes were studied.
This work continues the studies  on the de-
velopment of formulation of corrosion-inactive, low-
temperature solder pastes based on polyester resin
modified with rosin and quaternary ammonium salts.
Tetramethylammonium chloride (TMAC) was
taken as a flux. 2 g of TMAC was added to 15 g of
polyester resin modified with rosin and synthesized as
described in . The components were thoroughly
The characteristics of thermal oxidative degrada-
tion of both the composition and flux were determined
by dynamic thermogravimetry . To determine more
Fig. 1. Derivatogram of the (a) composition based on polyester resin and tetramethylammonium chloride and (b) tetramethylam-
monium chloride. (,m/m) Relative weight loss and (T) temperature.
precisely the temperature of the decomposition onset,
along with TG curve, we recorded the DTG and DTA
curves for both the substance studied and an inert
reference (Figs. 1a and 1b). Measurements were per-
formed with an MOM Q-1000 derivatograph (Hun-
gary) in the programmed heating mode. A 0.03-g
sample was heated in a platinum crucible in air, at a
heating rate of 10 deg min
. The sensitivities were as
follows: balance, 50 mg; DTA galvanometer, 1/3; and
DTG galvanometer, 1/10.
We found that the polyester resin + TMAC com-
position decomposes in air within the 703 650oC