scholarly journals Nanohardness of Electron Beam Irradiated Polyamide 6.6

2014 ◽  
Vol 606 ◽  
pp. 257-260 ◽  
Author(s):  
David Manas ◽  
Martin Ovsik ◽  
Miroslav Manas ◽  
Michal Stanek ◽  
Karel Kocman ◽  
...  
Keyword(s):  
Surface Layer ◽  
Electron Beam ◽  
Beta Radiation ◽  
Indentation Hardness ◽  
Radiation Doses ◽  
High Radiation ◽  
Polyamide 6.6 ◽  
Injection Technology

Nanomechanical changes in the surface layer of polyamide 6.6 modified by beta radiation were measured by instrumented test of nanohardness. The specimens were prepared by injection technology and subjected to radiation doses of 0, 33, 66, 99, 132, 165, 198kGy. Measurements of nanohardness showed considerable changes of behavior of surface layer in middle as well as high radiation doses with higher values of indentation hardness and stiffness.

Micromechanical Properties of Surface Layer of Electron Beam Irradiated of Glass-Filled PA6

2015 ◽  
Vol 752-753 ◽  
pp. 363-368
Author(s):  
David Manas ◽  
Martin Ovsik ◽  
Miroslav Manas ◽  
Michal Stanek ◽  
Petr Fiala ◽  
...  
Keyword(s):  
Surface Layer ◽  
Electron Beam ◽  
Beta Radiation ◽  
Indentation Hardness ◽  
Radiation Doses ◽  
High Radiation ◽  
Micromechanical Properties ◽  
Injection Technology

Micromechanical changes in the surface layer of glass-filled PA-6 modified by beta radiation were measured by instrumented test of microhardness. The specimens were prepared by injection technology and subjected to radiation doses of 0, 66, 99, 132 kGy. Measurements of microhardness showed considerable changes of behavior of surface layer in middle as well as high radiation doses with higher values of indentation hardness and stiffness.

scholarly journals Nanohardness of Electron Beam Irradiated HDPE

2014 ◽  
Vol 1025-1026 ◽  
pp. 410-414
Author(s):  
David Manas ◽  
Martin Ovsik ◽  
Miroslav Manas ◽  
Michal Stanek ◽  
Karel Kocman ◽  
...  
Keyword(s):  
Surface Layer ◽  
Electron Beam ◽  
High Density Polyethylene ◽  
High Density ◽  
Beta Radiation ◽  
Indentation Hardness ◽  
Radiation Doses ◽  
High Radiation ◽  
Injection Technology

Micromechanical changes in the surface layer of High-density polyethylene HDPE modified by beta radiation were measured by instrumented test of nanohardness. The specimens were prepared by injection technology and subjected to radiation doses of 0, 132, 165, 198 kGy. Measurements of nanohardness showed considerable changes of behavior of surface layer in middle as well as high radiation doses with higher values of indentation hardness and stiffness.

Micromechanical Properties of Glass-Filled Polyamide 6

2015 ◽  
Vol 1120-1121 ◽  
pp. 3-6
Author(s):  
David Manas ◽  
Martin Ovsik ◽  
Miroslav Manas ◽  
Michal Stanek ◽  
Pavel Stoklasek ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Surface Layer ◽  
Polyamide 6 ◽  
Polymer Materials ◽  
Beta Radiation ◽  
Indentation Hardness ◽  
Radiation Doses ◽  
High Radiation ◽  
Radiation Crosslinking ◽  
Injection Technology

The process of radiation crosslinking helps to improve some mechanical properties of polymer materials. Micromechanical changes in the surface layer of glass-filled PA-6 modified by beta radiation were measured by instrumented test of microhardness. The specimens were prepared by injection technology and subjected to radiation doses of 0, 66, 99, 132 kGy. Measurements of microhardness showed considerable changes of behavior of surface layer in middle as well as high radiation doses with higher values of indentation hardness and stiffness.

Micromechanical Properties of Thermoplastic Elastomer (TPE-E)

2015 ◽  
Vol 1120-1121 ◽  
pp. 1198-1201 ◽  
Author(s):  
David Manas ◽  
Martin Ovsik ◽  
Miroslav Manas ◽  
Michal Stanek ◽  
Pavel Stoklasek ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Surface Layer ◽  
Thermoplastic Elastomer ◽  
Polymer Materials ◽  
Beta Radiation ◽  
Indentation Hardness ◽  
Radiation Doses ◽  
High Radiation ◽  
Radiation Crosslinking ◽  
Injection Technology

The process of radiation crosslinking helps to improve some mechanical properties of polymer materials. Micromechanical changes in the surface layer of Thermoplastic elastomer (TPE-E) modified by beta radiation were measured by instrumented test of microhardness. The specimens were prepared by injection technology and subjected to radiation doses of 0, 66, 99, 132 kGy. Measurements of microhardness showed considerable changes of behavior of surface layer in middle as well as high radiation doses with higher values of indentation hardness and stiffness.

Micro-Hardness of Irradiated Polyamide

2016 ◽  
Vol 368 ◽  
pp. 162-165
Author(s):  
David Manas ◽  
Martin Ovsík ◽  
Miroslav Maňas ◽  
Michal Stanek ◽  
Lenka Hylová ◽  
...  
Keyword(s):  
Surface Layer ◽  
Glass Fiber ◽  
Injection Moulding ◽  
Beta Radiation ◽  
Indentation Hardness ◽  
Low Doses ◽  
Micro Hardness ◽  
Microhardness Test ◽  
Micromechanical Properties ◽  
High Doses

The influence of beta radiation on the changes in the structure and selected properties (mechanical and thermal) was proved. Using high doses of beta radiation for glass fiber filled polyamide (PA) and its influence on the changes of micromechanical properties of surface layer has not been studied in detail so far. The specimens of glass fiber filled PA were made by injection moulding technology and irradiated by low doses of beta radiation (0, 132, 165 and 198 kGy). The changes in the microstructure and micromechanical properties of surface layer were evaluated using WAXS and instrumented microhardness test. The results of the measurements showed change some in micromechanical properties (indentation hardness) when high doses of beta radiation are used.

The Behaviour of Cross-Linking Filled PA66 by Micro-Indentation Test

2016 ◽  
Vol 699 ◽  
pp. 43-48
Author(s):  
Martin Ovsik ◽  
David Manas ◽  
Miroslav Manas ◽  
Michal Stanek ◽  
Vojtech Senkerik
Keyword(s):  
Mechanical Properties ◽  
Surface Layer ◽  
Glass Fiber ◽  
Indentation Test ◽  
Polymer Materials ◽  
Beta Radiation ◽  
Indentation Hardness ◽  
Indentation Modulus ◽  
Polyamide 66 ◽  
Depth Sensing

The process of radiation crosslinking helps to improve some mechanical properties of polymer materials. Micro-mechanical changes in the surface layer of glass-fiber filled PA 66 modified by beta radiation were measured by the Depth Sensing Indentation - DSI method on samples which were non-irradiated and irradiated by different doses of the β - radiation. The specimens were prepared by injection technology and subjected to radiation doses of 0, 33, 66 nad 99 kGy. The change of micro-mechanical properties is greatly manifested mainly in the surface layer of the modified polypropylene where a significant growth of micro-hardness values can be observed. Indentation modulus increased from 1.8 to 3.0 GPa (increasing about 66%) and indentation hardness increased from 87 to 157 MPa (increasing about 80%). This research paper studies the influence of the dose of irradiation on the micro-mechanical properties of semi-crystalline polyamide 66 filled by 30% glass fiber at room temperature. The study is carried out due to the ever-growing employment of this type of polymer.

Evaluation of Mechanical Properties of Surface Layer Injection Molded Polypropylene by Nanoindentation Test

2016 ◽  
Vol 699 ◽  
pp. 86-90
Author(s):  
David Manas ◽  
Miroslav Manas ◽  
Martin Ovsik ◽  
Michal Stanek ◽  
Pavel Stoklasek ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Surface Layer ◽  
Elastic Modulus ◽  
Considerable Increase ◽  
Hardness Test ◽  
Beta Radiation ◽  
Nanoindentation Test ◽  
Indentation Hardness ◽  
Low Doses ◽  
Injection Molded

The influence of beta radiation on the changes in the structure and selected properties (mechanical and thermal) polymers were proved. The use of low doses of beta radiation for polypropylene and its influence on the changes of micro, macro mechanical properties was thoroughly studied. The specimens of polypropylene were made by injection molding technology and irradiated by low doses of beta radiation (0, 15 and 33 kGy). The changes in the microstructure and micromechanical properties of surface layer were evaluated using WAXS and instrumented nano hardness test. The results of the measurements showed considerable increase in mechanical properties (indentation hardness, indentation elastic modulus) when the beta radiation are used.

scholarly journals Nano-indentation test of electron beam irradiated polyamide 11

2018 ◽  
Vol 210 ◽  
pp. 02037
Author(s):  
Martin Ovsik ◽  
Lenka Hylova ◽  
Ivan Hudec ◽  
Adam Dockal
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Indentation Test ◽  
Polymeric Materials ◽  
Beta Radiation ◽  
High Tech ◽  
Indentation Hardness ◽  
Indentation Modulus ◽  
Beam Radiation ◽  
Polyamide 11

This article deals with the influence of electron beam radiation on nano-mechanical properties and the structure of polyamide 11. Crosslinking of polymers is a process, during which macromolecular chains start to connect to each other and the spatial network creates in the structure. During the action of the ionizing radiation two actions can occur: crosslinking and scission of macromolecules – degradation. Both these processes run parallel. Using the crosslinking technology the standard and construction polymer can obtain the more “expensive” high-tech polymeric materials properties and thus replace these materials in many applications. Tested material was irradiated by different doses of beta radiation (33, 66 and 99 kGy). The nano-mechanical properties were measured using DSI method, which fluently records the change of the indentation in time. From this dependence it is possible to determine nano-mechanical properties such as indentation hardness, indentation modulus etc. During results consideration it is obvious that irradiation acts on each polymer differently, but always when the optimal dose was found, nano-mechanical properties increased up to 34 %. The changes of nano-mechanical properties were confirmed by structural measurement when the change of hardness and modulus corresponded to gel content.

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