Application of Physical Methods for the Detection of a Thermally Degraded Recycled Material in Plastic Parts Made of Polypropylene Copolymer

Bĕhálek, Luboš; Dobránsky, Jozef; Pollák, Martin; Borůvka, Martin; Brdlik, P. M.

doi:10.3390/ma14030552

Cited by 3 publications

(3 citation statements)

References 34 publications

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“…It is a well-known fact that polymer chain breaking due to polymer degradation results in reduced molecular weight and increased flowability with temperature [20]. MFI is a simple test that can potentially offer detailed information about the degradation a polymer material has undergone [5,20]. Figure 9 shows the evolution of the MFI values after different reprocessing cycles.…”

Section: Melt Flow Indexmentioning

confidence: 99%

Recyclability Analysis of Starch Thermoplastic/Almond Shell Biocomposite

2021

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This article is focused on studying the effect of the reprocessing cycles on the mechanical, thermal, and aesthetic properties of a biocomposite. This process is based on starch thermoplastic polymer (TPS) filled with 20 wt% almond shell powder (ASP) and epoxidized linseed oil (ELO) as a compatibilizing additive. To do so, the biocomposite was prepared in a twin-screw extruder, molded by injection, and characterized in terms of its mechanical, thermal, and visual properties (according to CieLab) and the melt flow index (MFI). The analyses carried out were tensile, flexural, Charpy impact tests, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA). The effects of the reprocessing were also studied for the biodegradable unfilled TPS polymer. The results showed that TPS and TPS/ASP biocomposite suffer changes progressively on the properties studied after each reprocessing cycle. Furthermore, it was observed that the addition of ASP intensified these effects regarding TPS. However, in spite of the progressive degradation in both cases, it is technically feasible to reprocess the material at least three times without needing to incorporate virgin material.

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Section: Melt Flow Indexmentioning

confidence: 99%

Recyclability Analysis of Starch Thermoplastic/Almond Shell Biocomposite

2021

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“…The applicability of physical methods to detect thermally degraded recycled material in polypropylene plastic parts was investigated by Běhálek et al [4]. Standard methods of evaluating the mechanical properties of the material under static tensile and bending stress, as well as under dynamic impact stress using the Charpy method, were used for the experimental measurements.…”

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confidence: 99%

Special Issue: Processing, Structure, Dynamics and Mechanical Properties of Polymeric Materials

Sikora

2022

Materials

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The current Special Issue entitled “Processing, structure, dynamics and mechanical properties of polymeric materials” brings together scientists working at universities, research institutes, laboratories and various industries to discuss cutting-edge research on processing new polymeric materials using standard and innovative machines and to understand the structure and properties of these materials [...]

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“…The study by Behalek [36] et al was a pilot for the preparation of this article. The authors Valicek et al [37] and Ondruska et.…”

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confidence: 99%

Implementation of a Recycled Polypropylene Homopolymer Material for Use in Additive Manufacturing

et al. 2021

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The main objective of the presented scientific article is to define the mechanical properties of polypropylene homopolymer with a prescribed percentage ratio of recycled granulate. The chosen material is intended for injection molding and especially for the production of products made by additive technologies. Experimental verification of the mechanical properties was realized by testing samples produced with various concentrations of the recycled material. Experimental samples underwent tests to obtain the mechanical properties of the produced new material. These tests included rheological tests, tensile and flexural tests as well as and Charpy impact toughness tests. These mechanical tests were conducted according to ISO standards valid for the individual testing method. Testing methods were carried out using prescribed numbers of testing samples. The presented scientific article is also focused on changes in microstructures of testing materials in relation to the percentage ratio of recycled granulate. Recycled granulate of thermoplastic was not necessity for additional modifications.

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Application of Physical Methods for the Detection of a Thermally Degraded Recycled Material in Plastic Parts Made of Polypropylene Copolymer

Cited by 3 publications

References 34 publications

Recyclability Analysis of Starch Thermoplastic/Almond Shell Biocomposite

Recyclability Analysis of Starch Thermoplastic/Almond Shell Biocomposite

Special Issue: Processing, Structure, Dynamics and Mechanical Properties of Polymeric Materials

Implementation of a Recycled Polypropylene Homopolymer Material for Use in Additive Manufacturing

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