Thesis topic proposal
József Gábor Kovács
Recycling of high molecular weight thermoplastic materials


Institute: Budapest University of Technology and Economics
mechanical engineering
Géza Pattantyús-Ábrahám Doctoral School of Mechanical Engineering

Thesis supervisor: József Gábor Kovács
Location of studies (in Hungarian): 1111 Budapest, Műegyetem rkp. 3. T build. 309.
Abbreviation of location of studies: PT

Description of the research topic:

a.) Antecedents: Many projects are focusing onto the development of lightweight solutions for injection molded composite parts. The most promising technology is Thermoplastic-Resin Transfer Molding (T-RTM). To fulfill the EU requirements regarding end-of-life product management, efficient and reliable routes must be developed for mechanical recycling of this in-situ produced thermoplastic fiber-reinforced hybrid composites.
b.) Aim of research: The aim of the research is to develop methods to recycle of these polymers, composites and hybrid composites from the T-RTM process.
c.) Tasks, main items, necessary time:
• Literature review in the field of T-RTM and its materials. The main focus of the literature review is to define the most modern research results in the area of thermoplastics recycling. (approx. 12 month)
• In the first stage, we will focus on the rheological investigation of recyclates. We will test various types of additives that can improve the moldability of recycled PA-6. The final target is to define the best approaches for the mechanical recycling of reactive PA-6 based hybrid composites. We will investigate the influence of different process parameters on the recyclates performance during in-situ injection molding, overmolding and 3D printing. (approx. 20 month)
• We will develop methods to homogenize recyclates with additives and to define fiber length based on in-house developed optical measurement systems and novel numerical analyses. (approx. 16 month)
d.) Required equipment: The necessary equipment is available at the laboratory of the Department; besides some test devices are to be developed and built as a part of the research.
e.) Expected scientific results: The final target of the research is to define the best approaches for the mechanical recycling of reactive PA-6 based hybrid composites.
f.) References:
• Boros R., Kannan P. R., Kovács J. G.: Thermoplastic Overmolding onto Injection-Molded and In Situ Polymerization-Based Polyamides. Materials, 11, (2018)
• Tábi T., Égerházi A. Z., Tamás P., Czigány T., Kovács J. G.: Investigation of injection moulded poly(lactic acid) reinforced with long basalt fibres. Composites Part A (Applied Science and Manufacturing), 64, 99-106 (2014).
• Tábi T., Tamás P., Kovács J. G.: Chopped basalt fibres: A new perspective in reinforcing poly(lactic acid) to produce injection moulded engineering composites from renewable and natural resources. Express Polymer Letters, 7, 107-119 (2013)

Required language skills: english
Number of students who can be accepted: 1

Deadline for application: 2020-04-06

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