“Development of biodegradable microfibres based by polyhydroxybutyrate-co-valerate and evaluation of their properties”

Author, institution: Kira Krikštanavičienė, Kaunas University of Technology

Science area, field: Technological Sciences, Materials Engineering

The Doctoral Dissertation is available at the library of Kaunas University of Technology (K. Donelaičio St. 20, Kaunas).

Scientific Supervisor:

Prof. Dr. Sigitas STANYS (Kaunas University of Technology, Technological Sciences, Material Engineering – 08T).

Dissertation Defence Board of Materials Engineering Science Field:

Prof. Dr. Salvinija PETRULYTĖ (Kaunas University of Technology, Technological Sciences, Materials Engineering – 08T) – chairperson;

Assoc. Prof. Dr. Julija BALTUŠNIKAITĖ (Kaunas University of Technology, Technological Sciences, Materials Engineering – 08T);

Dr. Rimantas LEVINSKAS (Lithuanian Energy Institute, Technological Sciences, Materials Engineering – 08T);

Dr. Viktoras GRIGALIŪNAS (Kaunas University of Technology, Technological Sciences, Materials Engineering – 08T);

Dr. Vitalija RUBEŽIEN Ė (Textile Institute of Center for Physical Science and Technology, Technological Sciences, Materials Engineering – 08T).

Annotation:

Development and research of new biocompatible materials are relevant biomedical and biotechnological problems. The products from chemically synthesized polymers, such as poly (lactic acid) (PLA) or poly (glycolic acid) (PGA) are considered to be quickly degradable biomaterials dominating in the market of medical biodegradable products. Those material properties often do not meet the requirements for medical products. It was investigated and found, that nowadays there are not yet formed biodegradable multifilament yarns formed by extrusion on polyhydroxybutyrate-co-valerate (PHBV) copolymer basis.
The aim of the work was to develop and explore biodegradable microfiber structures (multifilament yarns) of PHBV copolymer and determine technological parameter influence on their mechanical and physical properties are the main goals of the work. In this work was determined the influence of extrusion technological parameters on the mechanical and physical properties of multifilament yarns. It was analysed the PLA and isotactis polypropylene (iPP) polymer admixing influence on mechanical properties of PHBV biodegradable multifilament yarns, formed by extrusion. It was determined that it is possible to form biodegradable two-component multifilament yarns by extruder on PHBV copolymer basis. It is presented in the work formed biodegradable multifilament yarns wetting kinetics by different fluids. The destruction mechanism of the formed multifilament yarns imitating the environment of the living organism and determine the influence of this process on yarn mechanical properties was also studied.