Polyamide Surface Layer Nano-Indentation and Thermal Properties Modified by Irradiation

Ovsík, Martin; Maňas, David; Staněk, Michal; Dockal, Adam; Vaněk, Jiřı́; Mizera, Aleš; Adámek, Milan; Stoklásek, Pavel

doi:10.3390/ma13132915

Cited by 10 publications

(12 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Indentation hardness H IT measures the resistance to permanent deformation or damage, where F max is the maximum force and A p is the projected contact area (theoretical or calibrated) [ 20 , 21 , 22 ].

…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Cross-Linked Polyamide 6 Micro-Indentation Properties: TAIC Concentration and Electron Radiation Intensity

2023

Self Cite

View full text Add to dashboard Cite

Nowadays, technical practice puts emphasis on improving selected material properties of polymers which could lead to new applications. Material properties can be modified in numerous ways, among which is radiation treatment. This study looks into the influence of beta radiation on several properties of polyamide 6, e.g., indentation hardness, modulus and creep. Main changeable parameters were the concentration of triallyl isocyanurate (TAIC), which promotes cross-linking, and intensity of radiation. The concentration was in the range from 2 to 6 wt.%, while the radiation dose was 0, 66, 99 and 132 kGy. The treated materials were measured for indentation hardness, modulus and creep. Degree of cross-linking was verified by thermo-mechanical analysis (TMA), while degradation processes was investigated by Fourier-transform infrared spectroscopy (FTIR). The results indicate that electron radiation positively affects the tested material properties. The best results were seen in polyamide with 6 wt.% of TAIC, which demonstrated a 38% improvement in mechanical properties after exposure to 132 kGy. This improvement in properties affects the final parts and their application (e.g., in the automotive industry—engine parts; in electrical engineering—insulation of wires and cables; and in industry—pipes for underfloor heating, etc.).

show abstract

…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Cross-Linked Polyamide 6 Micro-Indentation Properties: TAIC Concentration and Electron Radiation Intensity

2023

Self Cite

View full text Add to dashboard Cite

show abstract

“…The indentation modulus (E IT ) was calculated from the plane strain modulus (E * ) using an estimated Poisson's ratio (ν s ) of the sample (Polymer 0.3 to 0.4) [20,21].…”

Section: Micro-indentation Propertiesmentioning

confidence: 99%

The Influence of Surface Quality on Flow Length and Micro-Mechanical Properties of Polycarbonate

et al. 2021

Self Cite

View full text Add to dashboard Cite

This study describes the influence of polymer flow length on mechanical properties of tested polymer, specifically polycarbonate. The flow length was examined in a spiral shaped mould. The mould cavity’s surface was machined by several methods, which led to differing roughness of the surface. The cavity was finished by milling, grinding and polishing. In order to thoroughly understand the influence of the mould surface quality on the flow length, varying processing parameters, specifically the pressure, were used. The polymer part was divided into several segments, in which the micro-mechanical properties, such as hardness and indentation modulus were measured. The results of this study provide interesting data concerning the flow length, which was up to 3% longer for rougher surfaces, but shorter in cavities with polished surface. These results are in disagreement with the commonly practiced theory, which states that better surface quality leads to greater flow length. Furthermore, evaluation of the micro-mechanical properties measured along the flow path demonstrated significant variance in researched properties, which increased by 35% (indentation hardness) and 86% by indentation modulus) in latter segments of the spiral in comparison with the gate.

show abstract

“…The indentation modulus (E IT ) was calculated from the plane strain modulus (E*) using an estimated Poisson's ratio (ν s ) of the sample (Polymer 0.3 to 0.4) [20][21][22].…”

Section: Micro-indentation Propertiesmentioning

confidence: 99%

Influence of Cross-Linking Agent Concentration/Beta Radiation Surface Modification on the Micro-Mechanical Properties of Polyamide 6

et al. 2021

Self Cite

View full text Add to dashboard Cite

This study focuses on the problematic of polyamide 6 containing various concentrations of cross-linking agent that was exposed to electron radiation. It is important to improve the material properties of polymers as much as possible. This endeavor can be realized by numerous methods, one of which is radiation exposure. This study investigates the effect of electron beam radiation in doses ranging from 66 to 132 kGy on the micro-mechanical properties of polymers, specifically polyamide 6 filled with 1, 3 and 5 wt.% of cross-linking agent triallyl isocyanurate (TAIC). The changes in the material brought by the radiation exposure were quantified by measurements of indentation hardness and modulus, which were the main measured micro-mechanical properties. Furthermore, thermo-mechanical analysis (TMA) was chosen to confirm the results of the material cross-linking, while the effect of degradation was investigated by Fourier-transform infrared spectroscopy (FTIR). In pursuit of complete evaluation, the topography of the test subject’s surface was explored by atomic force microscopy (AFM). The optimal concentration/radiation ratio was found in polyamide 6 enriched by 5 wt.% concentration of TAIC, which was irradiated by 132 kGy. Material treated in such a way had its indentation hardness by 33% and indentation modulus improved by 26% in comparison with the untreated material. These results were subsequently confirmed by the TMA and FTIR methods.

show abstract

Polyamide Surface Layer Nano-Indentation and Thermal Properties Modified by Irradiation

Cited by 10 publications

References 26 publications

Evaluation of Cross-Linked Polyamide 6 Micro-Indentation Properties: TAIC Concentration and Electron Radiation Intensity

Evaluation of Cross-Linked Polyamide 6 Micro-Indentation Properties: TAIC Concentration and Electron Radiation Intensity

The Influence of Surface Quality on Flow Length and Micro-Mechanical Properties of Polycarbonate

Influence of Cross-Linking Agent Concentration/Beta Radiation Surface Modification on the Micro-Mechanical Properties of Polyamide 6

Contact Info

Product

Resources

About