scholarly journals Investigation of Morphology of Recycled PET by Modulated DSC

2017 ◽  
Vol 885 ◽  
pp. 263-268
Author(s):  
Bela Molnar ◽  
Ferenc Ronkay
Keyword(s):  
Heat Flow ◽  
Morphological Properties ◽  
Modulated Dsc ◽  
Scanning Calorimetry ◽  
Total Heat Flow ◽  
Recycled Pet ◽  
Modulated Differential Scanning Calorimetry ◽  
Poly Ethylene Terephthalate ◽  
Injection Molded ◽  
Poly Ethylene

During research injection molded samples were made from recycled poly (ethylene terephthalate) (PET). Morphological properties of samples were investigated by modulated differential scanning calorimetry (MDSC). Total heat flow was separated in two parts, reversing and non-reversing heat flow during measurements. Relationships were found between crystallization and melting processes: the initial crystallinity equals to the non-reversing melting, and the post-crystallization processes equals to reversing melting.

Polymeric foams from recycled thermoplastic poly(ethylene terephthalate)

2020 ◽  
pp. 0021955X2094856
Author(s):  
Mylene S Cadete ◽  
Tiago EP Gomes ◽  
Pedro J Carvalho ◽  
Victor F Neto
Keyword(s):  
Pore Size ◽  
Ethylene Terephthalate ◽  
Mechanical Analysis ◽  
Foam Formation ◽  
Scanning Calorimetry ◽  
Recycled Pet ◽  
Heterogeneous Distribution ◽  
Poly Ethylene Terephthalate ◽  
Challenges And Opportunities ◽  
Poly Ethylene

With the increase use of plastics, there is currently a concern with the waste of materials, resulting in a series of challenges and opportunities for the waste management sector. In the present work, poly(ethylene terephthalate) (PET) foam was produced from recycled PET (RPET) from used water bottles. The recycled material was manually prepared and foamed in batches with the assistance of nitrogen gas as the physical blowing agent. RPET was characterized using Differential Scanning Calorimetry (DSC), Dynamic Mechanical Analysis (DMA), Fourier Transform Infrared Spectroscopy (FTIR) and Thermogravimetric Analysis (TGA). The influence of the pressure on the foam formation was studied and the results obtained showed that this variable influences the final product characteristics. To evaluate the behavior of the foams, their morphology, response to deformation when subject to compression and their thermal conductivities were studied. The morphology analysis showed that operating at higher-pressure results in bigger pore size but also in an increased pore size heterogeneous distribution, and foams that exhibit a higher thermal conductivity.

Morphological and thermal characterization of an immiscible catalyzed polymer blends (PC/PET)

2021 ◽  
pp. 096739112110252
Author(s):  
O Meziane ◽  
AR Bensedira ◽  
M Guessoum
Keyword(s):  
Thermal Characterization ◽  
Morphological Properties ◽  
Scanning Calorimetry ◽  
Reactive Compatibilization ◽  
Force Microscopy ◽  
Melt Compounding ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Two Phases

The aim is to study the reactive compatibilization of two immiscible thermoplastic polyesters, namely polycarbonate (PC) and poly (ethylene terephthalate) (PET), by transesterification reactions through melt compounding. For this, a catalyst, which is hydrated samarium acetylacetonate (Sm(acac)3), is incorporated with concentrations of 0.10, 0.15 and 0.20 phr into the 70PC/30PET mixture. The characterization of the PC/PET blends by differential scanning calorimetry (DSC) revealed that, the transesterification reactions in the absence of catalyst are undetectable or practically impossible; however, by increasing the catalyst concentration, significant variations are noticed on the thermal properties. These modifications, due to the interfacial reactions between the two phases of the system, were also evidenced by variations in morphological properties observed after the study of atomic force microscopy (AFM).

The Study of Recycled Poly(Ethylene Terephthalate) Nanofibres from Pet Bottle

2016 ◽  
Vol 848 ◽  
pp. 3-6 ◽  
Author(s):  
Pornchaloem Naksuwan ◽  
Michal Komárek ◽  
Jana Salačová ◽  
Jiří Militký
Keyword(s):  
Ethylene Terephthalate ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
Scanning Calorimetry ◽  
Thermo Gravimetric ◽  
Recycled Pet ◽  
Melt Electrospinning ◽  
Poly Ethylene Terephthalate ◽  
Electrospinning Method ◽  
Poly Ethylene

Bottles made from poly (ethylene terephthalate) (PET) can be recycled and reused the material to reduce the amount of waste going into landfills. In this study, electrospun fibres from recycled PET were produced by a melt-electrospinning method. The effect of the melting temperature, applied voltage and distance between die and collector on the morphology of the electrospun fibres was investigated. Thermal properties of recycled PET were characterized by a differential scanning calorimetry (DSC) and a thermo gravimetric analysis (TGA). It was observed that recycled PET granules were melted at a temperature of 260, 290 and 310 °C, the melt polymer was electrospun at a high voltage of 38 kV and electrospinning was carried out at a distance of 12 cm. The Recycled PET electrospun had diameters ranging from 45 to 65 µm.

Effect of MMT concentrations as reinforcement on the properties of recycled PET/HDPE nanocomposites

2013 ◽  
Vol 33 (7) ◽  
pp. 615-623 ◽  
Author(s):  
Rizuan Mohd Rosnan ◽  
Agus Arsad
Keyword(s):  
Mechanical Test ◽  
Tensile Modulus ◽  
Recycled Pet ◽  
Single Screw Extruder ◽  
Poly Ethylene Terephthalate ◽  
Injection Molded ◽  
Poly Ethylene ◽  
Two Phases ◽  
The Impact ◽  
Compatibilizing Agent

Abstract The objective of this research is to investigate the effect of incorporating montmorillonite (MMT) on the mechanical, morphological, rheological, and thermal properties of recycled poly(ethylene terephthalate) (rPET) and high-density polyethylene (HDPE) nanocomposites. The MMT contents in 90:10 rPET/HDPE and 70:30 rPET/HDPE ranged from 1 to 5 wt.%. rPET/HDPE nanocomposites were prepared by using a single screw extruder, and injection molded to prepare mechanical test specimens. The samples underwent rheological tests by using a capillary rheometer, and the morphology of the nanocomposites was investigated by scanning electron microscopy (SEM). The thermal stability of the nanocomposites was tested using thermogravimetric analysis (TGA). The results showed that MMT acts as compatibilizing agent and improves phase dispersion and interfacial adhesion in the nanocomposites. The maximum tensile strength was found at 3 and 1 wt.% of MMT for the 90:10 and 70:30 rPET/HDPE blends. However, the tensile modulus decreased significantly with the incorporation of MMT. The impact strength for both the 90:10 and 70:30 blends reached a maximum at 3 wt.% and started to decrease beyond 3 wt.%. The incorporation of MMT increased the shear viscosity of the 90:10 and 70:30 blends, which reached a maximum value at 3 and 1 wt.%. SEM micrographs showed a good interaction of MMT that improved the adhesion between the two phases of blends and led to an increase in the mechanical properties of rPET/HDPE nanocomposites.

scholarly journals Enhanced Impact Strength of Recycled PET/Glass Fiber Composites

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1471
Author(s):  
Marco Monti ◽  
Maria Teresa Scrivani ◽  
Irene Kociolek ◽  
Åge G. Larsen ◽  
Kjell Olafsen ◽  
...  
Keyword(s):  
Impact Strength ◽  
High Performance ◽  
Recycled Pet ◽  
Ethylene Copolymers ◽  
Glass Fiber Composites ◽  
Reinforced Composite ◽  
Poly Ethylene Terephthalate ◽  
Injection Molded ◽  
Poly Ethylene ◽  
The Impact

In this paper, we report a study on the effects of different ethylene copolymers in improving the impact strength of a fiber-reinforced composite based on a recycled poly(ethylene terephthalate) (rPET) from post-consumer bottles. Different ethylene copolymers have been selected in order to evaluate the effects of the polar co-monomer chemical structure and content. The composite mixtures were prepared via melt extrusion, and the samples were manufactured by injection molding. Impact strength was evaluated using Izod tests, and a morphological study (FESEM) was performed. As a result, a composite with substantially improved impact properties was designed. This study demonstrates that a post-consumer PET from the municipal waste collection of plastic bottles can be successfully used as a matrix of high-performance, injection-molded composites, suitable for use in the automotive sector, among others, with no compromise in terms of mechanical requirements or thermal stability.

scholarly journals Comparative Study of Structural Changes of Polylactide and Poly(ethylene terephthalate) in the Presence of Trichoderma viride

2021 ◽  
Vol 22 (7) ◽  
pp. 3491
Author(s):  
Grażyna B. Dąbrowska ◽  
Zuzanna Garstecka ◽  
Ewa Olewnik-Kruszkowska ◽  
Grażyna Szczepańska ◽  
Maciej Ostrowski ◽  
...  
Keyword(s):  
Structural Changes ◽  
Ethylene Terephthalate ◽  
Molecular Mechanisms ◽  
Blot Hybridization ◽  
Trichoderma Viride ◽  
Cost Effective ◽  
Plastic Pollution ◽  
Scanning Calorimetry ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

Plastic pollution is one of the crucial global challenges nowadays, and biodegradation is a promising approach to manage plastic waste in an environment-friendly and cost-effective way. In this study we identified the strain of fungus Trichoderma viride GZ1, which was characterized by particularly high pectinolytic activity. Using differential scanning calorimetry, Fourier-transform infrared spectroscopy techniques, and viscosity measurements we showed that three-month incubation of polylactide and polyethylene terephthalate in the presence of the fungus lead to significant changes of the surface of polylactide. Further, to gain insight into molecular mechanisms underneath the biodegradation process, western blot hybridization was used to show that in the presence of poly(ethylene terephthalate) (PET) in laboratory conditions the fungus produced hydrophobin proteins. The mycelium adhered to the plastic surface, which was confirmed by scanning electron microscopy, possibly due to the presence of hydrophobins. Further, using atomic force microscopy we demonstrated for the first time the formation of hydrophobin film on the surface of aliphatic polylactide (PLA) and PET by T. viride GZ1. This is the first stage of research that will be continued under environmental conditions, potentially leading to a practical application.

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