Emanation thermal analysis of low-density polyethylene irradiated by electron beam

1998 ◽  
Vol 320 (1-2) ◽  
pp. 169-176
Author(s):  
I.N Beckman ◽  
V Balek
Keyword(s):  
Thermal Analysis ◽  
Electron Beam ◽  
Emanation Thermal Analysis ◽  
Low Density Polyethylene ◽  
Low Density

Surface and Adhesive Properties of Low-Density Polyethylene after Radiation Cross-Linking

2014 ◽  
Vol 606 ◽  
pp. 265-268 ◽  
Author(s):  
Martin Bednarik ◽  
David Manas ◽  
Miroslav Manas ◽  
Martin Ovsik ◽  
Jan Navratil ◽  
...  
Keyword(s):  
Electron Beam ◽  
High Performance ◽  
Chemical Properties ◽  
Low Density Polyethylene ◽  
Cross Linking ◽  
Low Density ◽  
X Rays ◽  
Radiation Processing ◽  
Adhesive Properties ◽  
Γ Rays

Radiation cross-linking gives inexpensive commodity plastics and technical plastics the mechanical, thermal, and chemical properties of high-performance plastic. This upgrading of the plastics enables them to be used in conditions which they would not be able to with stand otherwise. The irradiation cross-linking of thermoplastic materials via electron beam or cobalt 60 (gammy rays) is performed separately, after processing. Generally, ionizing radiation includes accelerated electrons, gamma rays and X-rays. Radiation processing with an electron beam offers several distinct advantages when compared with other radiation sources, particularly γ-rays and x-rays. The process is very fast, clean and can be controlled with much precision. There is no permanent radioactivity since the machine can be switched off. In contrast to γ-rays and x-rays, the electron beam can steered relatively easily, thus allowing irradiation of a variety of physical shapes. The energy-rich beta rays trigger chemical reactions in the plastics which results in networking of molecules (comparable to the vulcanization of rubbers which has been in industrial use for so long). The energy from the rays is absorbed by the material and cleavage of chemical bonds takes place. This releases free radicals which in next phase from desired molecular bonds. This article describes the effect of radiation cross-linking on the surface and adhesive properties of low-density polyethylene.

Selectivity of Thermal Analysis in the Branching Analysis of Low Density Polyethylene

2020 ◽  
Vol 221 (12) ◽  
pp. 2000095 ◽  
Author(s):  
PaulSeverin Eselem Bungu ◽  
Kristina Pflug ◽  
Harald Pasch
Keyword(s):  
Thermal Analysis ◽  
Low Density Polyethylene ◽  
Low Density

scholarly journals Co-Pyrolysis of Low-Density Polyethylene and Motor Oil—Investigation of the Chemical Interactions between the Components

Recycling ◽  
2020 ◽  
Vol 5 (4) ◽  
pp. 33
Author(s):  
Bart Rimez ◽  
Sacha Breyer ◽  
Odile Vekemans ◽  
Benoit Haut
Keyword(s):  
Mass Spectrometry ◽  
Thermal Analysis ◽  
High Resolution ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Motor Oil ◽  
Chemical Interactions ◽  
Analysis Methods ◽  
High Resolution Thermogravimetry

In this work, different thermal analysis methods have been used to study the co-pyrolysis of low-density polyethylene (LDPE) and motor oil. Two kinds of motor oil were considered, a fresh one and a used one. Through the comparison of experimental curves and so-called “theoretical curves”, high-resolution thermogravimetry experiments allowed highlighting interactions between the LDPE and each of the two oils, when they are co-pyrolyzed. While thermogravimetry coupled with mass spectrometry did not give any insights into these interactions, pyrolysis coupled to gaseous chromatograph and mass spectrometry allowed identifying aldehydes in the products of the co-pyrolysis of LDPE and each of the two oils. These aldehydes were not observed during the pyrolysis of the LDPE or the oils alone. On the basis of these results, various explanations for the formation of these aldehydes are proposed.

scholarly journals Pro-Degradant Activity of Naturally Occurring Compounds on Polyethylene in Accelerate Weathering Conditions

Materials ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 195 ◽  
Author(s):  
Nadka Tzankova Dintcheva ◽  
Delia Gennaro ◽  
Rosalia Teresi ◽  
Marilena Baiamonte
Keyword(s):  
Thin Films ◽  
Thermal Analysis ◽  
Vitamin E ◽  
Light Exposure ◽  
Low Density Polyethylene ◽  
Accelerated Weathering ◽  
Low Density ◽  
Naturally Occurring ◽  
Accelerate Weathering ◽  
High Concentrations

In this work, naturally occurring compounds, such as Vitamin E (VE) and Ferulic Acid (FA), at high concentrations, have been considered as pro-degradant agents for Low Density Polyethylene (PE). However, all obtained results using the naturally occurring molecules as pro-oxidant agents for PE have been compared with the results achieved using a classical pro-oxidant agent, such as calcium stearate (Ca stearate) and with neat PE. The preliminary characterization, through rheological, mechanical and thermal analysis, of the PE-based systems highlights that the used naturally occurring molecules are able to exert a slight plasticizing action on PE and subsequently the PE rigidity and crystallinity slightly decrease, while the ductility increases. To assess the pro-degradant activity of the considered naturally occurring compounds, thin films of neat PE and PE-based systems containing 2 and 3 wt.% Ca stearate, VE and FA have been produced and subjected to accelerated weathering upon UVB light exposure. All obtained results point out that the VE and FA, at these high concentrations, exert a clear pro-oxidant activity in PE and this pro-oxidant activity is very similar to that exerted by Ca stearate. Moreover, the VE and FA at high concentrations can be considered as suitable eco-friendly pro-degradant additives for PE, also in order to control the polyolefin degradation times.

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