scholarly journals Electron Beam Irradiation: A Method for Degradation of Composites Based on Natural Rubber and Plasticized Starch

Polymers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1950
Author(s):  
Elena Manaila ◽  
Gabriela Craciun ◽  
Daniel Ighigeanu ◽  
Ion Bogdan Lungu ◽  
Marius Dumitru ◽  
...  
Keyword(s):  
Electron Beam ◽  
Natural Rubber ◽  
Irradiation Dose ◽  
Electron Beam Irradiation ◽  
Chain Scission ◽  
Morphological Properties ◽  
Cross Linking ◽  
Atmospheric Conditions ◽  
Beam Irradiation ◽  
Plasticized Starch

Polymeric composites based on natural rubber (NR) and plasticized starch (PS) obtained by peroxide cross-linking have been subjected to electron beam irradiation in order to investigate their degradation. The amount of PS ranged from 10 to 50 phr and the irradiation dose from 150 to 450 kGy. Irradiation was performed in atmospheric conditions using a linear electron accelerator of 5.5 MeV. Changes in chemical, physical, structural, and morphological properties of composites were correlated with variables, such as PS loading and irradiation dose. Thus, mechanical properties, gel fraction, cross-linking degree, water uptake, weight loss in toluene/water were compared with those obtained before irradiation. The changes in structure and morphology were studied by Fourier Transform Infrared Spectroscopy and Scanning Electron Microscopy. Both PS loading and irradiation dose were found to be responsible for the degradation installing. Moreover, it has been shown that at the dose of 450 kGy, chain scission is dominant over cross-linking.

scholarly journals Study on Wear and Morphological Behavior of Electron Beam Dose Irradiated Polyoxymethylene Copolymer (POM-C)

2016 ◽  
Vol 44 ◽  
pp. 19-28
Author(s):  
Md. Shahinur Rahman ◽  
Heon-Ju Lee ◽  
Jong-Keun Yang ◽  
Konstantin Lyakhov ◽  
Muhammad Athar Uddin
Keyword(s):  
Electron Beam ◽  
Wear Rate ◽  
Electron Beam Irradiation ◽  
Surface Hardness ◽  
Morphological Properties ◽  
Irradiation Condition ◽  
Cross Linking ◽  
Physical Factors ◽  
Beam Irradiation ◽  
Beam Dose

Polyoxymethylene copolymer (POM-C) is the most prominent engineering thermoplastic consisting of repeating carbon-oxygen bonds in the form of oxymethylene groups (OCH2). It is widely used to make small gear wheels, ball bearings, precision parts, automotive and consumer electronics. In this study, the POM-C round blocks were irradiated with 165 KeV electron beam energy in five doses (100, 200, 300, 500 and 700 kGy) in vacuum condition at room temperature. The wear rate, surface hardness and morphological properties of electron beam dose irradiated POM-C blocks surfaces have been analyzed using pin on disk tribometer, optical microscopy, nano-indenter, Raman spectroscopy, 3D nano surface profiler and scanning electron microscopy (SEM). The electron beam irradiation transferred the wear phenomena of unirradiated POM-C sample from the abrasive wear (plough and cracks), adhesive wear  (grooving/striation, micropitting) and scraping to mild scraping and striation for the 100 kGy dose irradiated POM-C sample due to cross-linking (macroscopic networks), chemical free radicals formations and partial physical modification (smoothness), which can be concluded from tribometer, optical microscopic, SEM and Raman spectroscopic observations. It also reduced the surface wear rate and average surface roughness with increasing microsurface hardness at threshold value of cross-linking among all unirradiated and others doses irradiated POM-C blocks. The level of tribological (wear and morphology) attribute improvement relies on the electron beam irradiation condition (energy and dose rate) depending on chemical and physical factors of polymeric materials.

scholarly journals Wood Sawdust/Natural Rubber Ecocomposites Cross-Linked by Electron Beam Irradiation

Materials ◽  
2016 ◽  
Vol 9 (7) ◽  
pp. 503 ◽  
Author(s):  
Elena Manaila ◽  
Maria Stelescu ◽  
Gabriela Craciun ◽  
Daniel Ighigeanu
Keyword(s):  
Electron Beam ◽  
Natural Rubber ◽  
Electron Beam Irradiation ◽  
Beam Irradiation ◽  
Wood Sawdust

scholarly journals Radiation Processing and Characterization of Some Ethylene-propylene-diene Terpolymer/Butyl (Halobutyl) Rubber/Nanosilica Composites

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2431
Author(s):  
Elena Manaila ◽  
Anton Airinei ◽  
Maria Daniela Stelescu ◽  
Maria Sonmez ◽  
Laurentia Alexandrescu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Water Uptake ◽  
Irradiation Dose ◽  
Electron Beam Irradiation ◽  
Rubber Matrix ◽  
Scanning Electron Microscopy Data ◽  
Beam Irradiation ◽  
Ethylene Propylene ◽  
Ethylene Propylene Diene Terpolymer

Composites based on ethylene–propylene–diene terpolymer (EPDM), butyl/halobutyl rubber and nanosilica were prepared by melt mixing and subjected to different doses of electron beam irradiation. The effect of irradiation dose on the mechanical properties, morphology, glass transition temperature, thermal stability and water uptake was investigated. The efficiency of the crosslinking by electron beam irradiation was analyzed by Charlesby–Pinner parameter evaluation and crosslink density measurements. The scanning electron microscopy data showed a good dispersion of nanosilica in the rubber matrix. An improvement in hardness and 100% modulus was revealed by increasing irradiation dose up to 150 kGy. The interaction between polymer matrix and nanosilica was analyzed using the Kraus equation. Additionally, these results indicated that the mechanical properties, surface characteristics, and water uptake were dependent on crosslink characteristics.

Sign in / Sign up

Export Citation Format

Share Document