AND POLYMERIC MATERIALS
Russian Journal of Applied Chemistry, 2013, Vol. 86, No. 11, pp. 1773−1778.
Pleiades Publishing, Ltd., 2013.
Original English Text © E.V. Fomina, S.A. Zavrazhnov, V.A. Fomin, 2013, published in Zhurnal Prikladnoi Khimii, 2013, Vol. 86, No. 11, pp. 1825−1830.
Synthesis of Modiﬁ ed Polylatic Acid
and Its Use as a Base Thermoplastic
for Biodegradable Hot-Melt Adhesives
E. V. Fomina, S. A. Zavrazhnov, and V. A. Fomin
Academician Kargin Research Institute of Polymers, Dzerzhinsk, Nizhni Novgorod oblast, Russia
Received October 17, 2013
Abstract—New polylactic acid derivatives were synthesized and their thermal stability was studied. The new
products were tested as a biodegradable polymeric base for fabrication of hot-melt adhesives.
A particular researchers’ attention is presently
attracted by process for synthesis of polymeric products
based on derivatives of vegetable raw materials. This
is due, on the one hand, to the search for an alternative
to petrochemical source of raw materials and, on the
other, to the ability of these polymers to biodegrade into
harmless products and thereby to diminish the noxious
load on the environment [1–4].
An exceedingly topical problem is that associated
with development of biodegradable adhesives for
articles fabricated from biodegradable polymers widely
used in manufacture of packaging materials for food
products, fabrication of microelectronic elements, e.g.,
assembly of components for video cameras, cell hones,
and medicinal and other electric devices [5–7]. Use
of biodegradable hot-melt adhesives will ensure full
biodestruction of these articles in their utilization at
solid domestic garbage dumps or unauthorized disposal
ﬁ elds [8, 9].
In addition, use of biodegradable hot-melt adhesives
instead of bioundegradable adhesives containing
organic solvents markedly facilitates and accelerates the
gluing process because of not requiring any drying stage
accompanied by contamination of the environment by
the released solvents.
Of particular interest as raw materials for production
of hot-melt adhesives capable of biodegradation are var-
ious derivatives of lactic acid, which ﬁ nd wide use for
production of biodegradable household articles [2, 7].
The present study is concerned with problems
encountered in synthesis of new modiﬁ ed derivatives of
polylactic acid (PLA) and with their thermal stability
and adhesive properties in relation to the composition of
the polyester obtained.
The following starting substances were used in the
study: freshly distilled diethylene glycol [GOST (State
Standard) 10136–77], 1,4-butanediol [TU(Technical
Speciﬁ cation) 64-5-105–86], L(+) lactic acid from
Aldrich (aqueous solution containing 85% main
substance, CAS N 79-33-4), chloroform (TU 2631-066-
44493179–01 with revs. 1, 2), methanol (GOST 2222–
95), methylene chloride (TU 2412-426-05763441–
2004), triethylamine (GOST 9966–88), and distilled
water (GOST 6709–72).
The structure of the synthesized compounds was an-
alyzed by IR and NMR spectroscopies. IR spectra were
recorded with a Shimadzu IRAfﬁ nity IR Fourier spec-
trometer in the range 4000–400 cm
. NMR measure-
ments were made with a Bruker DPX-200spectrometer