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.

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.

Modification of Polylactic Acid/ Halloysite Bionanocomposites Using Electron Beam Radiation: Physical, Barrier and Thermal Properties

2020 ◽  
Vol 1002 ◽  
pp. 57-65
Author(s):  
Abdulkader M. Alakrach ◽  
Nik Noriman Zulkepli ◽  
Awad A. Al-Rashdi ◽  
Sam Sung Ting ◽  
Rosniza Hamzah ◽  
...  
Keyword(s):  
Electron Beam ◽  
Polylactic Acid ◽  
Food Packaging ◽  
Electron Beam Irradiation ◽  
Casting Process ◽  
Barrier Properties ◽  
Beam Irradiation ◽  
Beam Radiation ◽  
Electron Beam Processing ◽  
The Impact

This study aimed to develop novel Polylactic acid/ Halloysite (PLA/ HNTs) films which showed better properties when they were used for food packaging. They also displayed better mechanical, barrier, morphological and structural properties when the researchers analysed the impact of the electron beam irradiation on the nanomaterials. They prepared PLA-based nanocomposites containing 5 % w/w of HNTs using the solution casting process. These nanocomposites were further exposed to different ebeam doses (i.e., 0, 20, 40 and 60 kGy). The researchers assessed the effect of the electron beam irradiation on the various properties of the PLA. All the composites showed a homogenous dispersion and distribution of the HNTs in this PLA matrix. Results indicated that the nanocomposites showed better barrier properties in comparison to the neat PLA. Furthermore, the ebeam irradiation could increase the glass-transition temperature and lead to the development of more crosslinks, which increased the degradation temperature and hydrophilicity of the nanocomposites. In this study, the researchers showed that the PLA/HNTs films were effective materials that could be used for the electron beam processing of the pre-packed foods. The best effect was noted for the 20 kGy dosage which was used in the study.

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

A novel approach for preparing silver nanoparticles under electron beam irradiation

2009 ◽  
Vol 12 (4) ◽  
pp. 1423-1428 ◽  
Author(s):  
Kai Li ◽  
Fu-Shen Zhang
Keyword(s):  
Silver Nanoparticles ◽  
Electron Beam ◽  
Electron Beam Irradiation ◽  
Beam Irradiation ◽  
Novel Approach

Electron-beam-induced phase transition in the transmission electron microscope: the case of VO2(B)

CrystEngComm ◽  
2018 ◽  
Vol 20 (43) ◽  
pp. 6857-6860 ◽  
Author(s):  
Chun-Wei Huang ◽  
Shih-Shen Kuo ◽  
Cheng-Lun Hsin
Keyword(s):  
Phase Transition ◽  
Electron Beam ◽  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Electron Beam Irradiation ◽  
Transition Process ◽  
Beam Irradiation ◽  
Transmission Electron ◽  
Phase Transition Process

A phase transition process from VO2(B) to VO2(M1) was made possible under electron beam irradiation without the help of elevating the temperature.

Combined effect of dopant and electron beam-irradiation on phase transition in lithium potassium sulphate

2004 ◽  
Vol 69 (2) ◽  
pp. 103-107 ◽  
Author(s):  
M.E. Kassem ◽  
M. Gaafar ◽  
M.M.H. Abdel Gawad ◽  
M. El-Muraikhi ◽  
I.M. Ragab
Keyword(s):  
Phase Transition ◽  
Electron Beam ◽  
Electron Beam Irradiation ◽  
Combined Effect ◽  
Potassium Sulphate ◽  
Beam Irradiation

A Comparative Study of Electron Beam Radiation Treatment of Quinestrol, Norethindrone and Dienestrol from Wastewater and Toxicity Test

2014 ◽  
Vol 1073-1076 ◽  
pp. 86-89
Author(s):  
Ming Hong Wu ◽  
Jia Ling Li ◽  
Xiang Xin He ◽  
Yan Feng Sun ◽  
Gang Xu ◽  
...  
Keyword(s):  
Electron Beam ◽  
Toxicity Test ◽  
Degradation Rate ◽  
Electron Beam Irradiation ◽  
Radiation Treatment ◽  
Estrogenic Activity ◽  
Acidic Environment ◽  
Beam Irradiation ◽  
Beam Radiation ◽  
Electron Beam Radiation

The irradiation degradation of selected estrogens quinestrol (QS) , norethindrone (NET) and dienestrol (DS) were evaluated by electron beam . Processes using electron beam can efficiently degradate QS, NETand DS, usually at reaction dosage lower than 6KGy. Especially remarkable is the high degradation efficiency shown by oxygen saturation which is extremely favored by acidic environment. The order of the degradation rate: DS > NET> QS by different analysis methods such as HPLC. Among electron beam irradiation carried out, higher removal of 90% from solution was observed. In addition, the estrogenic activity of QS, NET and DS was carried out by rotifer test.

scholarly journals Effect of moisture on technological properties of corn starch modified by the electron beam irradiation

2020 ◽  
Vol 3 (3) ◽  
Author(s):  
Nguyen Dang My Duyen ◽  
Pham Ngoc Viet
Keyword(s):  
Electron Beam ◽  
Moisture Content ◽  
Electron Beam Irradiation ◽  
Corn Starch ◽  
Free Acid ◽  
Technological Properties ◽  
Beam Irradiation ◽  
Gel Structure ◽  
Beam Radiation ◽  
Starch Gel

Electron beam irradiation is one of the most effective starch modification methods. Moisture is one of the factors that is affected by the irradiation via the free radical formation. The effect of the moisture content on the technological properties of irradiated starch samples was studied. The moisture content of corn starch samples in this study was adjusted at 9.08, 12.96, 15.06, 20.39 and 29.09% (w w). Corn starch samples were irradiated at 5 kGy. Color, free acid, solubility, swelling, transparency, syneresis and starch gel structure were studied to elucidate the effect of the moisture on technological properties of corn starch treated by electron beam. The results showed that electron beam radiation caused starch samples at different moisture to break into small molecules due to the separation of the glycosidie bonds. Thus, free acid, swelling, solubility of irradiated starch samples were higher than those of natural starch samples and were increased with low moisture content. The results also indicated that electron beam treatment increased the syneresis of irradiated starch samples. The texture profile analysis (TPA) of starch gel structure showed that textural properties such as hardness, elasticity and chewiness of irradiated starch samples were higher than those of natural starch samples.

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

Phase transition of ice Ic to ice XI under electron beam irradiation

2012 ◽  
Vol 547 ◽  
pp. 9-12 ◽  
Author(s):  
Keita Kobayashi ◽  
Hidehiro Yasuda
Keyword(s):  
Phase Transition ◽  
Electron Beam ◽  
Electron Beam Irradiation ◽  
Beam Irradiation
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