Russian Journal of Applied Chemistry, 2013, Vol. 86, No. 8, pp. 1262−1267.
Pleiades Publishing, Ltd., 2013.
Original Russian Text © Yu.I. Matusevich L.P. Krul’, 2013, published in Zhurnal Prikladnoi Khimii, 2013, Vol. 86, No. 8, pp. 1288−1293.
AND POLYMERIC MATERIALS
A Photosensitive Material Based
on Methyl Methacrylate–Acrylic Acid Copolymer
Yu. I. Matusevich and L. P. Krul’
Research Institute of Physicochemical Problems, Minsk, Belarus
Received May 16, 2013
Abstract—The possibility of recording holographic images in a photosensitive material based on methyl methacry-
late–acrylic acid copolymer, which is more heat-resistant than poly(methyl methacrylate) used as a base for optical
recording media, was examined. Introduction of acrylic acid units into poly(methyl methacrylate) macromolecule
does not prevent recording and reconstruction of holographic images, but, at the same time, affects the dynamics
of variation of the diffraction efﬁ ciency of diffraction lattices recorded in this polymer.
Composite polymeric materials based on poly(methyl
methacrylate) (PMMA) with additions of anthraquinone
dyes, in particular, of 9,10-phenanthrenequinone (PAQ),
are widely used in systems for optical information
recording in the form of holographic images [1–5].
The possibility of using PMMA as an optical recording
medium is due to combination of high optical transparency
of this polymer and sufﬁ ciently high glass transition point
, exceeding 100°С, which ensures relative stability of
the recorded information. However, in some processes
such as preparation of PMMA–silicate glass joints the
recording medium can be subjected to prolonged action
of high pressure and temperatures exceeding Т
can lead to distortion of the recorded holographic image
. As a result, the use of the PMMA–PAQ system as
an optical recording medium operating in contact with
silicate glass at elevated temperatures is complicated
. Furthermore, the adhesion of PMMA to glass is
insufﬁ ciently high, which also negatively affects the
possibility of combining PMMA with other optical
Therefore, modiﬁ cation of PMMA with the aim to
improve its thermal and adhesion properties, with the
optical characteristics preserved, is a topical problem.
One of the ways of its solution can be copolymerization
of methyl methacrylate (MMA) with polar monomers
whose homopolymerization yields polymers that are
more heat-resistant than PMMA. It was shown previously
[8–10] that copolymerization of MMA with acrylic acid
(AA) yields a copolymer whose adhesion to glass and heat
resistance are higher than those of MMA homopolymer.
In this study we examine the possibility of optical
information recording in a medium based on MMA
copolymer containing 40 mol % AA units. This
composition is optimal from the viewpoint of thermal
and adhesion properties of the ﬁ lms obtained.
Poly(methyl methacrylate) and MMA–AA copolymer
were synthesized by the procedure described in [9, 11].
As a photosensitive system for recording holographic
images, we used 90-μm-thick ﬁ lms prepared from so-
lutions in dichloroethane (PMMA ﬁ lms) or acetic acid
(ﬁ lms of MMA–AA copolymer) with PAQ additions. The
PAQ content of the ﬁ lms was 6 mol % per monomeric
unit of the polymer or copolymer (taking into account
its composition). The diffraction lattices were recorded