scholarly journals Recycled PET ((Poly) Ethylene-erephthalate) used as straps for rebar binding

2016 ◽  
Vol 14 (3) ◽  
pp. 319-329
Author(s):  
Miodrag Grbic ◽  
Milan Glisic ◽  
Radojko Obradovic
Keyword(s):  
Experimental Method ◽  
Ethylene Terephthalate ◽  
Concrete Construction ◽  
Recycled Pet ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Annealed Wire ◽  
Eligibility Assessment ◽  
Recycled Material ◽  
Environment Preservation

Recycling has an important role in modern production and in environment preservation. Introduction of recycled PET ((Poly) Ethylene-terephthalate) as straps for reinforcement bars in concrete construction elements can help these important issues. By using an experimental method it is shown that PET straps made with minimal investment, on site and with manual production can replace "annealed" wire as element for connection of reinforcement bars. An overview of some regulation and procedures is presented and used for eligibility assessment of the proposed straps made of recycled material. Also an overview of commonly used connections is given so it can be compared with the proposed ones.

scholarly journals Novel Oligo-Ester-Ether-Diol Prepared by Waste Poly(ethylene terephthalate) Glycolysis and Its Use in Preparing Thermally Stable and Flame Retardant Polyurethane Foam

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 236 ◽  
Author(s):  
Cuong N. Hoang ◽  
Chi T. Pham ◽  
Thu M. Dang ◽  
DongQuy Hoang ◽  
Pyoung-Chan Lee ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Polyurethane Foam ◽  
Flame Retardancy ◽  
Ethylene Terephthalate ◽  
Recycled Pet ◽  
Pet Bottles ◽  
Poly Ethylene Terephthalate ◽  
Ul 94 ◽  
Poly Ethylene ◽  
Fire Properties

Rigid polyurethane foam (PUF) was successfully prepared from a novel oligo-ester-ether-diol obtained from the glycolysis of waste poly(ethylene terephthalate) (PET) bottles via reaction with diethylene glycol (DEG) in the presence of ZnSO4 7H2O. The LC-MS analysis of the oligodiol enabled us to identify 67 chemical homologous structures that were composed of zero to four terephthalate (T) ester units and two to twelve monoethylene glycol (M) ether units. The flame retardant, morphological, compression, and thermal properties of rigid PUFs with and without triphenyl phosphate (TPP) were determined. The Tg values showed that TPP played a role of not only being a flame retardant, but also a plasticizer. PUF with a rather low TPP loading had an excellent flame retardancy and high thermal stability. A loading of 10 wt % TPP not only achieved a UL-94 V-0 rating, but also obtained an LOI value of 21%. Meanwhile, the PUF without a flame retardant did not achieve a UL-94 HB rating; the sample completely burned to the holder clamp and yielded a low LOI value (17%). The fire properties measured with the cone calorimeter were also discussed, and the results further proved that the flame retardancy of the PUF with the addition of TPP was improved significantly. The polymeric material meets the demands of density and compression strength for commercial PUF, as well as the needs of environmental development. The current study may help overcome the drawback of intrinsic high flammability and enlarge the fire safety applications of materials with a high percentage of recycled PET.

Improving the properties of recycled PET/PEN blends by using different chain extenders

2016 ◽  
Vol 36 (6) ◽  
pp. 615-624 ◽  
Author(s):  
Simge Can ◽  
N. Gamze Karsli ◽  
Sertan Yesil ◽  
Ayse Aytac
Keyword(s):  
Ethylene Terephthalate ◽  
Chain Extender ◽  
Degree Of Crystallinity ◽  
Recycled Pet ◽  
H Nmr ◽  
Loading Level ◽  
Poly Ethylene Terephthalate ◽  
Chain Extenders ◽  
Izod Impact ◽  
Poly Ethylene

Abstract The main aim of this study was to improve the mechanical properties of the recycled poly(ethylene terephthalate)/poly(ethylene 2,6-naphthalate) (r-PET/PEN) blends by enhancing the miscibility between PET and PEN with the usage of chain extenders. This idea was novel for the recycled PET-based r-PET/PEN blends, as investigation of the effects of the chain extender usage on the properties of r-PET/PEN blends has not been studied in the literature, according to our knowledge. 1,4-Phenylene-bis-oxazoline (PBO), 1,4-phenylene-di-isocyanate (PDI), and triphenyl phosphite (TPP) were selected as chain extenders. The maximum tensile strength value was observed for the 1.0PDI sample. Moreover, PDI-based blends exhibited better Izod impact strength when compared with all other samples. The miscibility and degree of crystallinity values of all blends were discussed by means of thermal analysis. 1H-nuclear magnetic resonance (1H-NMR) analysis was carried out to determine transesterification reaction levels. According to 1H-NMR results, the increase in the level of transesterification was around 40% with the usage of PDI. The optimum loading level for selected chain extenders was determined as 1 wt.%, and PDI-based blends exhibited better properties when compared with those of the blends based on PBO and TPP at this loading level.

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.

Assessing changes on poly(ethylene terephthalate) properties after recycling: Mechanical recycling in laboratory versus postconsumer recycled material

2014 ◽  
Vol 147 (3) ◽  
pp. 884-894 ◽  
Author(s):  
María del Mar Castro López ◽  
Ana Isabel Ares Pernas ◽  
Mª José Abad López ◽  
Aurora Lasagabaster Latorre ◽  
J.M. López Vilariño ◽  
...  
Keyword(s):  
Ethylene Terephthalate ◽  
Mechanical Recycling ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Recycled Material

scholarly journals Study of flame retardancy, thermal and physical properties of rigid polyurethane foam based on recycled poly(ethylene terephthalate) using non-halogen flame retardant

2021 ◽  
Vol 5 (2) ◽  
pp. first
Author(s):  
Hà Tuyết Minh Nguyễn ◽  
DongQuy Hoang ◽  
Thị Chi Phạm
Keyword(s):  
Flame Retardant ◽  
Ethylene Terephthalate ◽  
Polyurethane Foams ◽  
Polymer Materials ◽  
Rigid Polyurethane Foam ◽  
Recycled Pet ◽  
Foam Structure ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Thermal Stability Of

Bis(2-hydroxyethyl) terephthalate (BHET) obtained from waste poly(ethylene terephthalate) bottles was used to synthesize polyurethane foams (B-PUF) and the fireproof B-PUF in the presence of nonhalogen flame retardant, namely, aluminum hydrogen phosphonate (AHP). Loading of 25 php AHP was needed for B-PUF/AHP to achieve UL-94 V-0 rating. The thermal stability of B-PUF was improved with the addition of AHP through the thermogravimetric analysis (TGA) results. In addition, other properties such as density and foam structure were also investigated. The outcomes of this study also confirmed that the B-PUF prepared from recycled PET not only were composed of a high percentage of waste poly(ethylene terephthalate), which could help reduce the amount of recycled polymer materials and improved waste management but also met the high demands for the fire safety of polymer applications.

scholarly journals Mechanical Properties of Composite Materials from Waste Poly(ethylene terephthalate) Reinforced with Glass Fibers and Waste Window Glass

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Biruk Gedif Worku ◽  
Tessera Alemneh Wubieneh
Keyword(s):  
Flexural Strength ◽  
Glass Fiber ◽  
Glass Powder ◽  
Ethylene Terephthalate ◽  
Window Glass ◽  
Glass Fibers ◽  
Recycled Pet ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Glass Filler

After primary uses of the plastic product, most developing countries like Ethiopia are facing a shortage of postconsumer disposal waste sites and it became a very serious problem on environmental pollution due to its nonbiodegradable nature. For this reason, regenerating and using the waste product as resources and reducing environmental pollutions are a great opportunity. This research is aimed at the manufacturing of composite materials from waste poly(ethylene terephthalate) (PET) bottles reinforced with glass fibers and filled with waste glass powder for floor tile applications. The tile composites were prepared by the melt-mixing method followed by compression molding. The effect of filler, fiber, and PET matrix loading on the composite was investigated using their tensile, compression, and flexural strength tests. The sample was characterized using a universal testing machine. PerkinElmer FTIR instrument was also used. For this, eleven samples prepared by varying the glass fiber weight % from 0 to 10, PET matrix weight % from 70 to 85, and glass powder filler weight % from 5 to 20. The measurement results of the composite were maximum tensile strength (81.625 MPa) and flexural strength (1067.59 MPa) recorded at 10%weight of glass fiber, 85% weight of PET matrix, and 5%weight of window glass filler. The maximum compressive strength is 1876.14 MPa at 10% weight glass fiber, 70 wt% PET matrix, and 20 wt% window glass filler. Based on this, the tensile strength and flexural strength increased with increased weight % of glass fiber and decreased with increased window glass filler. The FTIR spectrum shows some of the groups that have been removed from the recycled PET; this explains the brittleness of the recycled PET as compared to the waste bottle PET. The microstructure was uniformly distributed, and the material became opaque, probably because the decrease in chain length improves chain packing, increasing the crystallinity degree and crystal size.

The potential use of recycled PET bottle in nanocomposites manufacturing with modified ZnO nanoparticles capped with citric acid: preparation, thermal, and morphological characterization

RSC Advances ◽  
2016 ◽  
Vol 6 (18) ◽  
pp. 15039-15047 ◽  
Author(s):  
Shadpour Mallakpour ◽  
Mashal Javadpour
Keyword(s):  
Zno Nanoparticles ◽  
Ethylene Terephthalate ◽  
Morphological Characterization ◽  
Practical Application ◽  
Recycled Pet ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Modified Zno Nanoparticles ◽  
Potential Use ◽  
Host Polymer

We devised a fast and facile potential practical application by incorporating the guest ZnO nanoparticles (NPs) into poly(ethylene terephthalate) (PET) as a host polymer that recycled by dissolution/reprecipitation method.

Microcellular injection molding of recycled poly(ethylene terephthalate) blends with chain extenders and nanoclay

2014 ◽  
Vol 34 (1) ◽  
pp. 5-13 ◽  
Author(s):  
Yottha Srithep ◽  
Lih-Sheng Turng
Keyword(s):  
Mechanical Properties ◽  
Injection Molding ◽  
Ethylene Terephthalate ◽  
Average Cell Size ◽  
Recycled Pet ◽  
Average Cell ◽  
Poly Ethylene Terephthalate ◽  
Microcellular Injection Molding ◽  
Chain Extenders ◽  
Poly Ethylene

Abstract Poly(ethylene terephthalate) (PET) resin is one of the most widely used thermoplastics, especially in packaging. Due to thermal and hydrolytic degradations, recycled PET (RPET) exhibits poor mechanical properties and lacks moldability. The effects of adding chain extender (CE) and nanoclay to RPET were investigated. Melt blending of RPET with CE was performed in a thermokinetic mixer (K-mixer). The blended materials were then prepared via solid and microcellular injection molding processes. The effects of CE loading levels and the simultaneous addition of nanoclay on the thermal and mechanical properties and cell morphology of the microcellular components were noted. The addition of 1.3% CE enhanced the tensile properties and viscosity of RPET. The higher amount of CE (at 3%) enhanced the viscosity, but the margin of improvement in mechanical properties diminished. While the solid RPET and CE blends were fairly ductile, the samples with nanoclay and all microcellular specimens showed brittle fractural behavior. Finally, nanoclay and the increase of CE content decreased the average cell size and enlarged the cell density of the microcellular samples.

Construction and demolition waste as a source of PVC for recycling

2011 ◽  
Vol 30 (2) ◽  
pp. 115-121 ◽  
Author(s):  
Sabrina Moretto Darbello Prestes ◽  
Sandro Donnini Mancini ◽  
Antonio Rodolfo ◽  
Raquel Carramillo Keiroglo
Keyword(s):  
Ethylene Terephthalate ◽  
Ash Content ◽  
Construction And Demolition Waste ◽  
Particle Sizes ◽  
Virgin Material ◽  
Demolition Waste ◽  
Poly Ethylene Terephthalate ◽  
Application Potential ◽  
Poly Ethylene ◽  
Recycled Material

Construction and demolition waste can contain considerable amounts of polyvinyl chloride (PVC). This paper describes a study of the recycling of PVC pipes collected from such waste materials. In a sorting facility for the specific disposal of construction and demolition waste, PVC was found to represent one-third of the plastics separated by workers. Pipes were sorted carefully to preclude any possible contamination by poly(ethylene terephthalate) (PET) found in the waste. The material was ground into two distinct particle sizes (final mesh of 12.7 and 8 mm), washed, dried and recycled. The average formulation of the pipes was determined based on ash content tests and used in the fabrication of a similar compound made mainly of virgin PVC. Samples of recycled pipes and of compound based on virgin material were subjected to tensile and impact tests and provided very similar results. These results are a good indication of the application potential of the recycled material and of the fact that longer grinding to obtain finer particles is not necessarily beneficial.

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