Thesis supervisor: Kolos Molnár
Location of studies (in Hungarian): Polimertechnika Tanszék 1111 Budapest, Műegyetem rkp. 3. T. ép. 316. Abbreviation of location of studies: PT
Description of the research topic:
a.) Antecedents: The solution’s properties (molecular weight, branching, concentration etc.) play a crucial role in polymer processing. Most of the polymer solutions and melt shows a structure dependent viscosity (e.g. shear-thinning, thixotropy) and shows viscoelastic properties. These structural-rheological characteristics can be utilized in electrospinning to achieve better-controlled fiber morphology and increased throughput as demonstrated by our former studies.
b.) Aim of research: The aim of the research is to explore the relationships between the structure, the rheological characteristics and the fiber morphology and based on that, to develop advanced electrospinning techniques and related applications.
c.) Tasks, main items, necessary time:
• Literature review in the field of rheology, viscoelasticity, and related test methods (creep tests, dynamic mechanical analysis, master curves, etc.). The effect of processing parameters on electrospinning, the role of electrospun fibers in composites (approx. 9 month).
• Testing the rheological characteristics of polymer solutions, nanofiber sample preparation. The effect of molecular structure and weight on the rheological characteristics. (approx. 15 month)
• Finding the relationships between throughput, morphology with the rheological characteristics and molecular weight. Using these results in needleless electrospinning techniques, generation of nanofiber reinforced composite test samples (approx. 12 month).
• Application of the nanofibers in composites and self-reinforced composites. The effect of the structure dependent flow characteristics on the structure and performance of the composites generated. Results systematization, thesis submission (approx. 12 month).
d.) Required equipment: The necessary equipment is available at the laboratory of the Department; besides some molds and test setups are to be developed and built as a part of the research.
e.) Expected scientific results: Better quality and more affordable nanofibers; nanofibers from novel materials, tougher and eco-friendly thermoplastic composite structures. A deeper understanding of the connections between the molecular structure, the processing, the short- and long-term behavior of linear polymeric materials.
f.) References:
• Peer P., Zelenkova. J.; Filip P., Lovecka L.: An Estimate of the Onset of Beadless Character of Electrospun Nanofibers Using Rheological Characterization. Polymers 13, 265/1-265/11 (2021).
• He H., Gao M., Török D., Molnár K.: Self-feeding electrospinning method based on the Weissenberg effect. Polymer, 190, 122247/1-122247/9 (2020).
Required language skills: ENGLISH Number of students who can be accepted: 1
Deadline for application: 2022-03-30
2024. IV. 17. ODT ülés Az ODT következő ülésére 2024. június 14-én, pénteken 10.00 órakor kerül sor a Semmelweis Egyetem Szenátusi termében (Bp. Üllői út 26. I. emelet).
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