Search academic texts

Information × Registration Number 0226U002002, (0124U000789) , R & D reports Title Synthesis and modification of new biodegradable polymers and thermoplastic (nano)composites based on them for multipurpose function popup.stage_title Дослідження закономірностей модифікування полілактидів синтезованими полігідроксіалканоатами та іншими біодеградабельними полімерами, мінеральними наповнювачами й іншими додатками. Дослідження закономірностей одержання біодеградабельних (нано)композитів. Встановлення фізико-хімічних і технологічних особливостей процесів екструзії, лиття під тиском, 3Д друку технології залежно від природи полімерної матриці, наповнювача, модифікатора. Head Skorokhoda Volodymyr Yo., Доктор технічних наук Registration Date 04-02-2026 Organization Lviv Polytechnic National University popup.description1 Development of physical-chemical and technological fundamentals of the technologies for obtaining, modifying and processing new biodegradable polymers and mixtures based on natural and synthesized modified polymer matrices suitable for application as multi-purpose materials with adjustable biodegradability and high working properties. popup.description2 The regularities of polylactide modification using microbially synthesised polyhydroxyalkanoates, other biodegradable polymers, and mineral fillers were investigated. The rheological properties of polylactide (PLA) and polyhydroxybutyrate (PHB) melts in the temperature range of 170–210 °C were studied. The melts exhibited pseudoplastic flow behaviour, manifested by a decrease in viscosity with increasing shear rate. It was shown that unstabilized PHB displays unstable melt flow at 180 °C, which limits the allowable temperature–time processing conditions. The rheological behaviour of PLA/PHB blends was examined, and it was established that the minimum values of the viscosity-reduction rate constant are observed for blends containing 5 wt.% PHB, indicating enhanced rheological stability and the presence of a synergistic effect. The sorption properties of composites based on PLA/PHB blends filled with hydroxyapatite (HA) were investigated. Increasing the HA content from 10 to 50 wt.% resulted in a rise in water absorption from 2% to 19%, enabling controlled tuning of hydrophilicity and operational properties. Film materials were obtained based on a PLA/PHB blend modified with polycaprolactone (PCL). The tensile strength of films prepared by solution casting from chloroform was 38 MPa, while the elongation at break reached 46%, which is attributed to the plasticizing effect of PCL. Thermogravimetric analysis revealed the multistage nature of thermal degradation of the biodegradable thermoplastic. X-ray diffraction (XRD) analysis showed that the obtained PLA/PHB blends possess a semi-crystalline structure with a degree of crystallinity of 30–50%. The formation behaviour of porous composites based on PHB and HA produced by compression moulding was investigated. The optimal processing conditions were established as a temperature range of 165–180 °C and a pressure of 40 MPa. Product Description popup.authors Melnyk Yuriy Levytskyi Volodymyr Ye. Galyna Dudok Nataliya Semenyuk Oleksandr Ivanukh Ihor Semeniuk Yurij Stetsyshyn popup.nrat_date 2026-02-04 Close