scholarly journals Structural Changes in Polyethylene Terephthalate (PET) Waste Materials Caused by Pyrolysis and CO2 Activation

2006 ◽  
Vol 24 (5) ◽  
pp. 439-450 ◽  
Author(s):  
José B. Parra ◽  
Conchi O. Ania ◽  
Ana Arenillas ◽  
Fernando Rubiera ◽  
José J. Pis ◽  
...  
Keyword(s):  
Polyethylene Terephthalate ◽  
Structural Changes ◽  
Waste Materials ◽  
Co2 Activation ◽  
Pet Waste

XRD investigation of thermal degradation of some gamma-irradiated polyethylene terephthalate samples

2019 ◽  
Vol 33 (12) ◽  
pp. 1950111 ◽  
Author(s):  
Mihai Todica ◽  
Zoltan Kovacs-Krauss ◽  
Carmen Niculaescu ◽  
Marieta Mureşan-Pop
Keyword(s):  
Thermal Treatment ◽  
Polyethylene Terephthalate ◽  
Structural Changes ◽  
Diffraction Method ◽  
Resonance Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Before And After ◽  
Gamma Irradiated ◽  
Different Doses

The modification of local structure of some commercial polyethylene terephthalate (PET) samples, gamma irradiated at different doses, was investigated by X-ray diffraction method before and after thermal treatment. Before the thermal treatment, the samples exposed to different doses of gamma radiations, does not show noticeable structural changes. However, the gamma exposure affects the thermal behavior of samples submitted to melting–cooling process. These modifications have been highlighted by X-ray diffraction, and confirmed also by thermal analysis and electron spin resonance spectroscopy.

scholarly journals Ion Charge Influence on the Molecular Structure of Polyethylene Terephthalate Films after Irradiation with Swift Heavy Ions

Crystals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 479
Author(s):  
Adil Z. Tuleushev ◽  
Maxim V. Zdorovets ◽  
Artem L. Kozlovskiy ◽  
Fiona E. Harrison
Keyword(s):  
Polyethylene Terephthalate ◽  
Structural Changes ◽  
Diffraction Method ◽  
Dipole Interaction ◽  
Heavy Ion ◽  
Cross Linking ◽  
X Ray Diffraction ◽  
Chain Molecules ◽  
Repeat Units ◽  
Pet Film

We report here experimental results investigating the influence of the initial swift heavy ion charge on the structure of polyethylene terephthalate (PET) film after irradiation, using a structurally sensitive X-ray diffraction method. Kr ions with an energy of 100 MeV and charges of 13+, 14+, and 15+ were each used at irradiation fluences of 5 × 1010, 7.5 × 1010, 1 × 1011, 2.5 × 1011 and 5 × 1011 ions/cm2. At constant energy and irradiation fluence, the post-irradiation structural changes in PET film show a clear dependence on the initial ion charge. As either the fluence or ion charge increase, the latent tracks begin to overlap, leading to cross-linking of PET chain molecules to form rotational isomers (rotamers). We use the fluence corresponding to the onset of overlapping to estimate the size of latent tracks for different ion charges. At the highest fluences, the latent tracks become entirely overlapped, and the interchain cross-linking extends throughout the whole film. Since this cross-linking is due to the dipole–dipole interaction of subunits of repeat units of PET chain molecules, it is reversible, in contrast to the well-known chemical cross-linking of polymer chain molecules under irradiation.

Use of Micronized Polyethylene Terephthalate (Pet) Waste in Asphalt Binder

2015 ◽  
Vol 33 (15-16) ◽  
pp. 1508-1515 ◽  
Author(s):  
J. de Arimateia Almeida e Silva ◽  
L. C. de Figueirêdo Lopes Lucena ◽  
J. K. Guedes Rodrigues ◽  
M. W. Carvalho ◽  
D. Beserra Costa
Keyword(s):  
Polyethylene Terephthalate ◽  
Asphalt Binder ◽  
Pet Waste

scholarly journals Conversion of Waste Polyethylene Terephthalate (PET) Polymer into Activated Carbon and Its Feasibility to Produce Green Fuel

Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3952
Author(s):  
Firdous Ahmad Ahangar ◽  
Umer Rashid ◽  
Junaid Ahmad ◽  
Toshiki Tsubota ◽  
Ali Alsalme
Keyword(s):  
Activated Carbon ◽  
Polyethylene Terephthalate ◽  
Analytical Techniques ◽  
Waste Cooking Oil ◽  
Physiochemical Properties ◽  
Pet Waste ◽  
Pet Bottles ◽  
Palm Fatty Acid Distillate ◽  
Temperature Programmed ◽  
Green Fuel

In this study, a novel idea was proposed to convert the polyethylene terephthalate (PET) waste drinking-water bottles into activated carbon (AC) to use for waste cooking oil (WCO) and palm fatty acid distillate (PFAD) feasibility to convert into esters. The acidic and basic char were prepared by using the waste PET bottles. The physiochemical properties were determined by employing various analytical techniques, such as field emission scanning electron microscopy (FESEM), thermogravimetric analysis (TGA), Fourier transform infrared (FTIR), Brunauer–Emmett–Teller (BET) and temperature-programmed desorption – ammonia/carbon dioxide (TPD-NH3/CO2). The prepared PET H3PO4 and PET KOH showed the higher surface area, thus illustrating that the surface of both materials has enough space for impregnation of foreign precursors. The TPD-NH3 and TPD-CO2 results depicted that PET H3PO4 is found to have higher acidity, i.e., 18.17 mmolg−1, due to the attachment of phosponyl groups to it during pretreatment, whereas, in the case of PET KOH, the basicity increases to 13.49 mmolg−1. The conversion results show that prepared materials can be used as a support for an acidic and basic catalyst for the conversion of WCO and PFAD into green fuel.

Tailoring Structural Properties of Polyethylene Terephthalate (PET) by 200 keV Ar+ Implantation

2013 ◽  
Vol 665 ◽  
pp. 221-226 ◽  
Author(s):  
Mahak Chawla ◽  
Rubi Rubi ◽  
Rajiv Kumar ◽  
Annu Sharma ◽  
Sanjeev Aggarwal ◽  
...  
Keyword(s):  
Polyethylene Terephthalate ◽  
Structural Changes ◽  
Urbach Energy ◽  
Energy Gap ◽  
Optical Parameters ◽  
Spectroscopic Techniques ◽  
Structural Behaviour ◽  
Optical Energy Gap ◽  
Uv Visible ◽  
Fluence Range

In the present work, our aim is to reveal the effect of Ar+implantation on the structural behaviour of Polyethylene terephthalate (PET) using Fourier Transform Infrared and UV-Visible Spectroscopic techniques. PET specimens were implanted with 200 keV Ar+ions in the fluence range of 1x1015to 1x1017ions cm-2. The structural changes have been observed due to change in the position and intensity of the bands in the FTIR spectra of both implanted and unimplanted specimens. A continuous decrease in optical energy gap (from 3.63 eV to 1.48 eV) and enhancement in Urbach energy (from 0.29 eV to 3.70 eV) with increasing ion dose have been observed. The structural changes have been correlated with the optical parameters observed in PET specimens as a result of implantation.

Sign in / Sign up

Export Citation Format

Share Document