Study on the influence of electron beam irradiation on the thermal, mechanical, and rheological properties of ethylene-octene copolymer with high comonomer content

2012 ◽  
Vol 128 (5) ◽  
pp. 3026-3033 ◽  
Author(s):  
Sameepa Poongavalappil ◽  
Petr Svoboda ◽  
Rajesh Theravalappil ◽  
Dagmar Svobodova ◽  
Michal Danek ◽  
...  
Keyword(s):  
Electron Beam ◽  
Rheological Properties ◽  
Electron Beam Irradiation ◽  
Beam Irradiation ◽  
Ethylene Octene Copolymer ◽  
Comonomer Content

Effect of Electron Beam Irradiation on the Rheological Properties and Phase Transition Temperature of Poly(N-Vinylcaprolactam)

2020 ◽  
Vol 865 ◽  
pp. 19-24
Author(s):  
Shane C. Halligan ◽  
Kieran A. Murray ◽  
Olivier Vrain ◽  
John G. Lyons ◽  
Luke M. Geever
Keyword(s):  
Phase Transition ◽  
Electron Beam ◽  
Rheological Properties ◽  
Smart Materials ◽  
Electron Beam Irradiation ◽  
Beam Irradiation ◽  
Beam Radiation ◽  
Rheological Analysis ◽  
Novel Approach ◽  
Potential Applications

Exposing smart materials to electron beam radiation can induce free radical reactions, such as chain branching or crosslinking, hence enhancing the characteristics of the polymers. Poly (N-vinylcaprolactam) (PNVCL) is a smart material which was synthesised by photopolymerisation. Subsequently, samples were exposed to electron beam technology, where electron beam irradiation was utilised in a novel approach. This led to the modification of the rheological and phase transition properties. Modifying PNVCL through electron beam irradiation opens new avenues and potential applications in the biomedical field. Physically cross-linked PNVCL polymers were prepared by photopolymerisation and samples were subsequently irradiated at different dose ranges (5kGy, 25kGy and 50 kGy). The rheological properties of the PNVCL based samples were established by rheological analysis. Similarly, the PNVCL based sample polymers were further characterised in solution to determine the phase transition of PNVCL.

Rheological Properties of Poly(Lactic acid) Modified by Electron Beam Irradiation

Polymer Korea ◽  
2010 ◽  
Vol 34 (5) ◽  
pp. 485-489
Author(s):  
Boo Young Shin ◽  
Bong Shik Kim
Keyword(s):  
Electron Beam ◽  
Lactic Acid ◽  
Rheological Properties ◽  
Electron Beam Irradiation ◽  
Poly Lactic Acid ◽  
Beam Irradiation

EFFECT OF ELECTRON BEAM IRRADIATION ON THE STRUCTURE–PROPERTY RELATIONSHIP OF ETHYLENE OCTENE COPOLYMER AND POLYDIMETHYL SILOXANE RUBBER BLENDS

2016 ◽  
Vol 89 (3) ◽  
pp. 477-498 ◽  
Author(s):  
Padmanabhan Ramachandran ◽  
Kinsuk Naskar ◽  
Golok B. Nando
Keyword(s):  
Electron Beam ◽  
Electron Beam Irradiation ◽  
Physicomechanical Properties ◽  
Cross Linking ◽  
Structure Property ◽  
Beam Irradiation ◽  
Polydimethyl Siloxane ◽  
Structure Property Relationship ◽  
Ethylene Octene Copolymer ◽  
Relationship Of

ABSTRACT The effects of electron beam irradiation on the structure–property relationship of blends can be studied based on ethylene octene copolymer (EOC) and polydimethyl siloxane (PDMS) rubber at three different blend ratios prepared with a melt mixing technique. Irradiation with 2.5 MeV electron beam accelerating energy, over a radiation dose varying from 25 to 150 kGy, causes cross-linking in both the EOC and the PDMS phases. However, cross-linking of the EOC phase without affecting the crystallinity of the EOC polymer leads to tremendous improvement in the physicomechanical properties, including the tensile strength, which improves by nearly 35% for 70:30 EOC:PDMS blends. Morphology of the blends before and after irradiation can be analyzed by scanning electron microscopy and atomic force microscopy and correlated with the physicomechanical properties. The physicomechanical properties of the individual polymer components after irradiation show that radiation cross-linking is more effective for PDMS rubber than it is for EOC. However, at higher radiation doses, chain scissions are possible in both EOC and PDMS rubber, which affect the physicomechanical properties. Through blending and subsequent radiation cross-linking, the maximum degradation temperature of EOC can be increased from 488.6 to 512.8 °C.

scholarly journals Influence of Electron Beam Irradiation on the Moisture and Properties of Freshly Harvested and Sun-Dried Rice

Foods ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 1139 ◽  
Author(s):  
Lihong Pan ◽  
Jiali Xing ◽  
Xiaohu Luo ◽  
Yanan Li ◽  
Dongling Sun ◽  
...  
Keyword(s):  
Electron Beam ◽  
Rheological Properties ◽  
Water Distribution ◽  
Electron Beam Irradiation ◽  
Low Dose ◽  
Bound Water ◽  
Free Water ◽  
Textural Properties ◽  
Rice Starch ◽  
Beam Irradiation

Moisture content is an important factor that affects rice storage. Rice with high moisture (HM) content has superior taste but is difficult to store. In this study, low-dose electron beam irradiation (EBI) was used to study water distribution in newly harvested HM (15.03%) rice and dried rice (11.97%) via low-field nuclear magnetic resonance (LF-NMR). The gelatinization, texture and rheological properties of rice and the thermal and digestion properties of rice starch were determined. Results showed that low-dose EBI could change water distribution in rice mainly by affecting free water under low-moisture (LM) conditions and free water and bound water under HM conditions. HM rice showed smooth changes in gelatinization and rheological properties and softened textural properties. The swelling power and solubility index indicated that irradiation promoted the depolymerization of starch chains. Overall, low-dose EBI had little effect on the properties of rice. HM rice showed superior quality and taste, whereas LM rice exhibited superior nutritional quality. This work attempted to optimize the outcome of the EBI treatment of rice for storage purposes by analyzing its effects. It demonstrated that low-dose EBI was more effective and environmentally friendly than other techniques.

scholarly journals Improvements in the Rheological Properties, Impact Strength, and the Biodegradability of PLA/PCL Blend Compatibilized by Electron-Beam Irradiation in the Presence of a Reactive Agent

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Jae Sung Jeon ◽  
Do Hung Han ◽  
Boo Young Shin
Keyword(s):  
Electron Beam ◽  
Rheological Properties ◽  
Electron Beam Irradiation ◽  
Poly Lactic Acid ◽  
Beam Irradiation ◽  
Thermal Stabilities ◽  
Beam Radiation ◽  
Electron Beam Radiation ◽  
Twin Screw ◽  
Compatibilized Blends

In this study, we blended poly(ε-caprolactone) (PCL) into poly(lactic acid) (PLA) and compatibilized these PLA/PCL blends by electron-beam irradiation in the presence of a reactive agent to overcome drawbacks of PLA. To produce compatibilized blends, mixtures of the PLA/PCL/reactive agent were prepared using a twin-screw extruder and exposed to electron-beam radiation at room temperature. Glycidyl methacrylate (GMA) was chosen as the reactive agent to achieve interfacial cross-copolymerization between PLA and PCL phases. Morphological, rheological, and mechanical properties and biodegradabilities of blends were investigated. The morphological study showed significantly improved interfacial adhesion for compatibilized blends, and this was supported by FTIR analysis and a rheological study. Impact strengths, thermal stabilities, and rheological properties of PLA/PCL blends were improved by compatibilization, and the biodegradabilities of compatibilized PLA/PCL blends were greater than that of pure PLA.

Long-Chain Branched Polypropylenes by Electron Beam Irradiation and Their Rheological Properties

2004 ◽  
Vol 37 (25) ◽  
pp. 9465-9472 ◽  
Author(s):  
Dietmar Auhl ◽  
Jens Stange ◽  
Helmut Münstedt ◽  
Beate Krause ◽  
Dieter Voigt ◽  
...  
Keyword(s):  
Electron Beam ◽  
Rheological Properties ◽  
Electron Beam Irradiation ◽  
Beam Irradiation ◽  
Long Chain

Effect of controlled electron beam irradiation on the rheological properties of nanosilica-filled LDPE-EVA based thermoplastic elastomer

2010 ◽  
Vol 119 (4) ◽  
pp. 2153-2166 ◽  
Author(s):  
S. Hui ◽  
S. Mushtaq ◽  
T. K. Chaki ◽  
S. Chattopadhyay
Keyword(s):  
Electron Beam ◽  
Rheological Properties ◽  
Electron Beam Irradiation ◽  
Thermoplastic Elastomer ◽  
Beam Irradiation

Methods to Monitor and Improve the Performance of Specimen Holders for Transmission Electron Cryomicroscopy

1996 ◽  
Vol 54 ◽  
pp. 454-455
Author(s):  
B. L. Armbruster ◽  
B. Kraus ◽  
M. Pan
Keyword(s):  
Electron Microscopy ◽  
Electron Beam ◽  
Electron Beam Irradiation ◽  
Beam Irradiation ◽  
Quality Of Data ◽  
Electron Cryomicroscopy ◽  
Thermal Equilibration ◽  
Transmission Electron ◽  
Electron Microscopes

One goal in electron microscopy of biological specimens is to improve the quality of data to equal the resolution capabilities of modem transmission electron microscopes. Radiation damage and beam- induced movement caused by charging of the sample, low image contrast at high resolution, and sensitivity to external vibration and drift in side entry specimen holders limit the effective resolution one can achieve. Several methods have been developed to address these limitations: cryomethods are widely employed to preserve and stabilize specimens against some of the adverse effects of the vacuum and electron beam irradiation, spot-scan imaging reduces charging and associated beam-induced movement, and energy-filtered imaging removes the “fog” caused by inelastic scattering of electrons which is particularly pronounced in thick specimens.Although most cryoholders can easily achieve a 3.4Å resolution specification, information perpendicular to the goniometer axis may be degraded due to vibration. Absolute drift after mechanical and thermal equilibration as well as drift after movement of a holder may cause loss of resolution in any direction.

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