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.

Calcium Stearate and Alumina Trihydrate Addition of Irradiated LDPE, EVA and Blends with Electron Beam

2013 ◽  
Vol 290 ◽  
pp. 31-37 ◽  
Author(s):  
Maziyar Sabet ◽  
Mohd Syafiq Bin Anuwar
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Ethylene Vinyl Acetate ◽  
Calcium Stearate ◽  
Low Density Polyethylene ◽  
Cross Linking ◽  
Low Density ◽  
Irradiation Effects ◽  
Polymeric Blends ◽  
Alumina Trihydrate

Irradiation effects on the properties of alumina trihydrate (ATH) / low-density polyethylene (LDPE)/ ethylene vinyl acetate (EVA) / calcium stearate (CS) have been studied and confirmed that EVA and CS addition to the polymeric blends have improved the mechanical properties. ATH addition increased the cross-linking density and improved the blend reinforcing factor but deteriorated the blend mechanical properties. CS addition made ease the ATH dispersion inside polymer matrix. CS addition optimum value in blends was 3 phr and CS addition above 3 phr value deteriorated the blends mechanical properties.

High performance linear low density polyethylene nanocomposites reinforced by two-dimensional layered nanomaterials

Polymer ◽  
2019 ◽  
Vol 172 ◽  
pp. 142-151 ◽  
Author(s):  
Tao Li ◽  
Haoyang Sun ◽  
Fan Lei ◽  
Dandan Li ◽  
Jing Leng ◽  
...  
Keyword(s):  
High Performance ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Two Dimensional ◽  
Linear Low Density Polyethylene

Surface Energy of Selected Polyolefins after Radiation Cross-Linking

2015 ◽  
Vol 752-753 ◽  
pp. 342-345
Author(s):  
Martin Bednarik ◽  
David Manas ◽  
Miroslav Manas ◽  
Michal Stanek ◽  
Jan Navratil ◽  
...  
Keyword(s):  
Surface Energy ◽  
High Density Polyethylene ◽  
Beta Radiation ◽  
Low Density Polyethylene ◽  
Cross Linking ◽  
Bonded Joints ◽  
Adhesive Properties ◽  
High Quality ◽  
Measurement Results ◽  
Untreated Material

In this study there was found that radiation cross-linking increased the surface energy of high-density polyethylene (HDPE), and low-density polyethylene (LDPE). Surface energy affects the wettability of the surface and is very important for creating of high-quality bonded joints. The measurement results indicated that radiation cross-linking was a very effective tool for the improvement of adhesive properties and increased the surface energy of selected polyolefins. Surfaces of selected materials with ionizing beta radiation with doses of 0, 33, 66, 99, 132, 165, and 198 kGy were irradiated. The best results were achieved by irradiation at dose of 165 kGy. The surface energy after irradiation was increased up to 100 % compared to untreated material.

Stabilization effect of polypyrrole in ϒ-irradiated low density polyethylene

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Traian Zaharescu ◽  
Silviu Jipa
Keyword(s):  
Antioxidant Activity ◽  
Pyrrole Ring ◽  
Protective Action ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Neat Polymer ◽  
Protection Mechanism ◽  
Stabilization Effect ◽  
Γ Rays ◽  
Oxidative Ageing

AbstractUnder the degradative action of γ-rays, low density polyethylene (LDPE) blended with 5% polypyrrole (PPy) was oxidized extra slow than the neat polymer. FTIR and UV-Viz spectroscopy’s were used for the assessment of the accumulation of oxygen-containing products. The transmittance recorded for LDPE at characteristic bands was higher than similar features obtained for LDPE/PPy samples. The protective action of PPy against oxidative ageing of polymer substrate is due to the movable proton belonging to pyrrole ring. A protection mechanism scheme is proposed for antioxidant activity of polypyrrole

Impact of γ-rays on constructional, optical and thermal behavior of alkaline and non alkaline low density polyethylene

2020 ◽  
Vol 175 (7-8) ◽  
pp. 765-777
Author(s):  
M. Madani ◽  
A. S. El-Bayoumi ◽  
S. S. Aly ◽  
A. Abdeldaym ◽  
M. Hammam
Keyword(s):  
Thermal Behavior ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Γ Rays

scholarly journals Analysis of radiation effects on chicken eggs and meat irradiated by nanosecond electron beams

2020 ◽  
Vol 176 ◽  
pp. 03016
Author(s):  
Ruslan Vazirov ◽  
Sergey Sokovnint ◽  
Alisa Romanova ◽  
Ksenia Moiseeva
Keyword(s):  
Electron Beam ◽  
Shelf Life ◽  
Radiation Effects ◽  
Chemical Properties ◽  
Food Products ◽  
Modern Method ◽  
Radiation Processing ◽  
Radiation Technology ◽  
Physico Chemical ◽  
Chicken Eggs

Chicken and eggs are considered the most common product in the world. Microorganisms on the surface and inside these food products reduce the shelf life and may be the causative agents of the disease among consumers. To solve this problem various methods of thermal and chemical treatment are used, which have several disadvantages. Radiation processing is a modern method of suppressing contamination of bacteria and increasing the shelf life of food products. Unfortunately, this technology has a negative effect on the physico-chemical and organoleptic properties of the product. Therefore, for food and hatching eggs the dose level is limited about 3 kGy. However to solve this problem it is possible to use a low-energy electron beam. This approach allows irradiating with a disinfecting dose only the surface and a shallow depth of products. Experiments on the irradiation of chicken meat and eggs were carried out at the accelerators URT-0.5 and URT-1. Studying the effect of irradiation with a nanosecond electron beam (NEB) on edible chicken eggs showed no significant changes in the eggs structure and physico-chemical properties. This is primarily due to the low depth of electron penetration. Therefore, most of the product is not irradiated by electrons. Thus, irradiation using the URT accelerators will reduce the main problem of the food radiation technology.

Sign in / Sign up

Export Citation Format

Share Document