ISSN 1070-4272, Russian Journal of Applied Chemistry, 2017, Vol. 90, No. 1, pp. 106−112. © Pleiades Publishing, Ltd., 2017.
Original Russian Text © V.A. Syusyukina, Ye. Shapovalova, N.M. Korotchenko, I.A. Kurzina,
2017, published in Zhurnal Prikladnoi Khimii, 2017, Vol. 90, No. 1,
Structural-Phase State and Surface Properties
of Composite Materials Based on Polylactide
V. A. Syusyukina*, Ye. Shapovalova, N. M. Korotchenko, and I. A. Kurzina
National Research Tomsk State University, pr. Lenina 36, Tomsk, 634050 Russia
Received November 28, 2016
Abstract—The phase composition and unit cell parameters were determined for composites based on polylactide
and hydroxyapatite with the polylactide/hydroxyapatite weight ratios of 90/10, 80/20, 70/30, and 60/40. As the
polylactide content of the composites is increased, they become less hydrophilic, and the surface energy σ
increases from 29.13 to 74.35 mJ m
. The sample with the component weight ratio of 70/30 is characterized
by the maximal roughness, and the Ca
ions from simulated body ﬂ uid are actively adsorbed onto its
surface, as proved by SEM examination of the composites.
Biocompatible composite materials of wide
spectrum are used as implants in modern medicine. The
development of various medical biocomposites based
on hydroxyapatite (HA)  and lactic acid polymers
and oligomers  is a promising line of research at the
junction of chemistry and biomedicine .
Composite materials allow useful properties of the
components to be successfully combined to reach the
required set of properties. The matrix in the material
is a biocompatible polymer exhibiting high strength.
Polylactide (PL) is the most promising in this respect. It
undergoes biodegradation in a living body to form lactic
acid, is biocompatible, and can positively inﬂ uence the
composite bioresorption rate. The composite material
should contain hydroxyapatite as inorganic component
ensuring afﬁ nity for the bone tissue. The choice of
hydroxyapatite is governed by the fact that its chemical
composition is similar to that of the mineral constituent
of bones [4, 5]. A number of approaches to preparing
composite materials based on PL and HA are described in
the literature. Tormala et al.  considered the possibility
of preparing a composite biomaterial based on HA and
poly-L-lactide in the form of laminates. Their procedures
involved simultaneous synthesis of the components.
Verheyen et al.  were able to prepare a biocompatible
material by mixing HA with a PL solution before
polymerization and obtained a highly porous sample.
Shikinami and Okuno  described in detail a procedure
for preparing a composite biomaterial by pressing a PL/
HA mixture based on uncalcined and unsintered HA.
The results obtained by Ignjatovic et al. [9, 10] are
interesting for practice. They synthesized blocks of PL/
HA composite biomaterial with highly crystalline HA
component in two steps. The porosity of the composite,
molecular mass, and amorphous/crystalline ratios in the
composite can be appreciably changed by hot pressing
at the melting point of the polymer. Furukawa et al. [11,
12] also suggested an approach to preparing ultra-high-
strength PL/HA composite. However, the characteristics
of the materials obtained using different methods widely
vary. The inﬂ uence of the composition on the properties
of the composites is insufﬁ ciently understood. A
procedure based on mixing the components in the solid
state or in solution, followed by pressing, was suggested
previously. This procedure is cost- and time-saving; it
allows preparation of composite materials exhibiting the
required set of properties, porosity, and bioresorption.