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.com
Volume 7
Journal of Material Sciences & Engineering
Biopolymers Summit 2018
June 04-06, 2018
June 04-06, 2018 Osaka, Japan
7
th
World Congress on
Biopolymers and Polymer Chemistry
Effect of biodegradation on physical properties of PLA-based blends
Ivan Chodak
1
, Silvie Pekařová
2
, Ján Bočkaj
3
, Marek Koutný
2
, Pavel Kucharczyk
3
, Vladimír Sedlařík
3
, Ivica Janigová
1
, Michaela Sedničková
1
and Daniela
Jochec-Mošková
1
1
Polymer Institute SAS, Slovakia
2
Tomas Bata University, Czech Republic
3
Slovak University of Technology in Bratislava, Slovakia
B
iodegradable plastics undergo substantial changes due to degradation by enzymes produced by various bacteria. From
application point of view, modification of physical properties is important, occurring even when the testing specimens
are apparently unchanged. Degradation in compost of Polylactic Acid (PLA), PLA with a plasticizer Triacetin (TAC) and a
mixture of PLA/Polyhydroxybutyrate (PHB)/TAC proceeded at temperature 58
o
C up to 16 days. Then, the biodegradation
degree was determined by measuring the content of evolved carbon. The degradation rate was found to vary a little for the
three samples. While the biodegradation tests were performed to almost complete biodegradation of the materials to carbon
dioxide and water. Physical properties could be measured only for the first eight days and in some cases up to 16 days when it is
possible to separate the material from the compost. At longer periods the materials have been disintegrated to small fragments
and separation of the sample from compost was impossible. Numbers of testing methods were applied. Molecular weight and
molecular weight distribution was determined by GPC, supported by measuring the viscosity by rheology. Structures of the
materials were estimated from changes in Tg and crystallinity. Mechanical properties of samples and the data were compared
with information obtained from dynamic mechanical analysis. The conclusions have been made regarding the effect of TAC
and PHB presence on the biodegradation of PLA and related changes concerning the structure/mechanical relations.
Acknowledgement:
The support from projects VEGA 1/0570/17, APVV 15-0741 is appreciated.
Biography
Ivan Chodak he is currently Full Professor of Macromolecular Science, Slovak Technical University Education. His research focus on Multiphase systems with
a modified polymeric matrix, synthesis and properties. Crosslinking of polymers, especially polyolefins and rubbers. Nano composites with polymeric matrices,
special experience with matrices of biodegradable plastics and rubbers. Modification of biodegradable plastics, physical, chemical, blending. Electro conductive
polymeric composites. A member of Editorial Board of Plasty a kaucuk (Plastics and Rubber), Czech republic, member of Editorial board of Bentham Open
Macromolecular Journal. More than 130 papers in peer reviewed international scientific journals (mainly CC),8 chapters in monographies, about 100 lectures in
scientific conferences (including about 30 invited key and plenary lectures), 12 slovak patents, 3 European patents. Around 900 citations, Hirsch index 14.
upolchiv@savba.skIvan Chodak et al., J Material Sci Eng 2018, Volume 7
DOI: 10.4172/2169-0022-C7-110