Róbert Várdai

Disintegration Behavior in Industrial Conditions of Poly(lactic acid)/Poly(hydroxybutyrate- co -valerate) Blends

Vito Gigante, Corrado Sciancalepore, Róbert Várdai, Duccio Gallichi-Nottiani et autres

-valerate) (PHBV) blends by exploring the full compositional spectrum (neat polymers and three intermediate ratios), bridging the gap between degradation behavior, the underlying thermal and mechanical properties, and crystallinity. Extrusion and injection molding techniques were used as processing techniques, and they were …

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Macro‐ and Micromechanical Deformations and Failure of Recycled PET /Flax Polyester Biocomposites

Bianca Dal Pont, Laura Aliotta, Vito Gigante, Massimo Giffoni et autres

ABSTRACT Environmental sustainability has become a global priority aimed at reducing waste generation and dependence on fossil resources. This study reports on the development of sustainable biocomposites by combining flax woven fabrics (2, 4, and 6 plies) with UPRs synthesized from recycled …

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Factors determining the Enzymatic degradation of PLA/PHBV blends

Nóra Hegyesi, Róbert Várdai, Corrado Sciancalepore, Daniel Milanese et autres

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The effect of organocatalytic acetylation on water sensitivity and mechanical performance in starch Acetate/Polylactide composites

Muriel Józó, Róbert Várdai, János Móczó, Francisco Vilaplana et autres

Abstract The integration of starch with polylactide often leads to suboptimal compatibility and compromises in mechanical properties, especially when processed using conventional melt processing methods. Although the property profile of the polyester can be effectively tailored by the incorporation of starch, the …

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Optimization of Gelatin-Based Scaffolds for Soft Tissue Regeneration: In Vitro and In Vivo Performance

Zita Szűcs-Takács, Viktoria Evelin Varga, Viktória Harcsa, Balázs Gábor Pinke et autres

In this study, promising compositions of cross-linked gelatin-based scaffolds were tested in vitro and in vivo. Our aim was to utilize a solid matrix that is suitable for medical applications, and to be regulated as a medical device as a soft tissue …

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Fiber reinforced structural material from the waste of a multilayer food packaging film: Interactions, structure, properties

Imre Romsics, Róbert Várdai, Emese Pregi, Gábor Faludi et autres

• fibers with different sizing resulted in considerably differing properties. • fibers sized for commodity polymers are encapsulated into the polyethylene phase. • interfacial interactions determine structure, deformation processes and properties. • fiber sized for PA adheres strongly to the matrix and …

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Machine learning-driven property predictions of polypropylene composites using IR spectroscopy

Szilvia Klébert, Róbert Várdai, Anita Rácz

There is a growing need for environmentally friendly alternatives to the determination of the mechanical properties, thermal stability and other functional characteristics of polymer composites, which led to the use of machine learning modeling combined with fast, non-destructive measurements like Fourier-transform infrared …

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Engineering material from flexible food packaging waste: Property profile and feasibility

Róbert Várdai, Imre Romsics, Emese Pregi, Gábor Faludi et autres

Abstract The goal of this project was to recycle the waste forming in the production of a flexible, multilayer food packaging film. The film consists of five layers, two polyamides containing three different polymers, a polyethylene and two adhesive layers of maleated …

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Water-Insoluble, Thermostable, Crosslinked Gelatin Matrix for Soft Tissue Implant Development

Viktoria Evelin Varga, László Smeller, Róbert Várdai, Bence Kocsis et autres

In this present study, the material science background of crosslinked gelatin (GEL) was investigated. The aim was to assess the optimal reaction parameters for the production of a water-insoluble crosslinked gelatin matrix suitable for heat sterilization. Matrices were subjected to enzymatic degradation …

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Factors and processes determining the impact resistance of PP impact copolymers with multi-phase structure

Milán Ferdinánd, Michael Jerabek, Róbert Várdai, Emese Pregi et autres

The impact resistance of four polypropylene impact copolymers (ICPs) with multi-phase structures and widely differing characteristics was related to their structure.Blends were prepared from one of them and a high-density polyethylene (HDPE) to improve impact strength further.The structure of the materials was …

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Comprehensive Machine Learning Modeling on the IR Spectra of Polypropylene Composites

Szilvia Klébert, Róbert Várdai, Anita Rácz

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Interactions, Structure and Properties of PLA/lignin/PBAT Hybrid Blends

Emese Pregi, Imre Romsics, Róbert Várdai, Béla Pukánszky

Poly(butylene adipate-co-terephthalate) (PBAT) was added to poly(lactic acid) (PLA)/lignin blends to decrease the considerable stiffness and brittleness of the blends. Two- and three-component blends were prepared in a wide composition range through homogenization in an internal mixer followed by compression molding. Interactions …

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