THE DESTRCTION OF THE COMPOSITIONS BASED ON CHITOSAN COPOLYMERS WITH ACRYLIC MONOMERS BY MICROMYCETES - Biochemistry and Biotechnology: Research and Development - page 141

The comparison of the obtained results with the MMD change data (fig. 1, 2) shows that
namely within the first six weeks an abrupt decrease of the molecular mass of PMA chains as
components of block and grafted copolymers of chitosan-methylacrylate. The molecular mass
of the grafted chains decreases three times from 1,3*106 to 4,0*105 and remains almost
without change further. In case with the block copolymers there is also a correlation between
the change in the physical-mechanical properties and MM. Both the parameters change
steadily throughout the whole experiment.
In such a way both in case with the block copolymers and the grafted ones a considerable
change in MMD of the synthetical compound of the (co)polymer on the sixth week of the
experiment is connected with the consumption of PMA by the fungi.
On the basis of the obtained results the following conclusions can be drawn:

The synthetical polymers modified by the natural ones are involved in the fungi
metabolism and are prior to biodestruction;

The MM of a synthetical polymer strongly affects the biodegradation of the material.
There is an optimal rate of the MM of a synthetic polymer (4,0*10 5 - 6,0 *10 5 ) which
makes possible to create a totally biodegradatable material.

The given results testify to a probability of the creation of hybrid (natural-synthetic)
chitosan polymers with methylacrylate with high physical-mechanical qualities and adjustable
biodegradation period.

R EFERENCES

[1] Blades, A., Belyaev, P., Sokolov, MV. Disposal and recycling of polymeric materials:

Textbook. Tambov: Izd Tambov State. Tekhn. Press, 2005. 80 ( In Russian).

[2] Patent US 2010/0076099 A1, Int.Cl. C08J 9/00 C08K 3/34. Biodegradable polymeric

nanocomposite compositions particularly for packaging./ A.K. Morhanty, Y. Parulekar,
M. Chidambarakumar, N. Kositruangchai, B.R. Harte - Pub.date: 25.03.2010.

[3] Patent US 7,750,065 B2, Int. Cl. C08K 5/04 C09K 21/14 C09D 5/16 C08G 77/04.

Flame-retargrdant biodegradable material and manufacturing method of the same,
flame-retargrdant biodegradable polymeric composition, and molded product and
disposable method of the same./ K. Yao - Pub.date: 6.07.2010.

[4] Patent US 2007/0129467 A1, Int.Cl. D21H 19/54. Bio based biodegradable polymer

compositions and use of the same./ F. Scheer - Pub.date: 7.01.2007.

[5] Patent US 2010/0120943 A1, Int. Cl. C08K 9/04 C08L 51/02 C08K 5/053. Strach-

polyster biodegradable craft copolymers nd a method of preparation thereof./ R.
Narayan, S. Balakrishnan, Y. Nabar, J.-M. Raquez, Ph. Dubois - Pub.date: 13.05.2010.

[6]

Patent US 6, 660,211 B2, Int. Cl. B29C 35/10 B29C 47/00 B28C 71/04. Metods of
making biodegradable film having enhanced ductility and breathability./ V.A.
Topolkaraev, D.A.Soerens - Pub. date: 9.12.2003;

[7] Patent US 2004/0242722 A1, Int. Cl. A61F 2/00 C08K 3/00. Biodegradable polymer

system./ J. Rose, S. Hardwick - Pub. date: 2.12.2004.