Study of Nano-Creep of Unfilled and Filled Cross-Linking Polypropylene

Ovsík, Martin; Staněk, Michal; Řezníček, Martin; Hylova, Lenka

doi:10.4028/www.scientific.net/msf.919.103

Cited by 4 publications

(4 citation statements)

References 10 publications

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“…The indentation hardness (H IT ) was calculated as maximum load (F max ) to the projected area of the hardness impression (A p ) and the indentation modulus (E IT ) is calculated from the Plane Strain modulus (E*) using an estimated sample Poisson's ratio according to [12][13][14][15]:…”

Section: Nano-indentation Testmentioning

confidence: 99%

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Local Nano-Mechanical Properties of Cross-Linked Polybutylene

Ovsík

Staněk

Dockal

et al. 2020

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Cross-linking is a process in which polymer chains are associated through chemical bonds. The cross-linking level can be adjusted by the irradiation dosage and often by means of a cross-linking booster. The polymer additional cross-linking influences the surface nano and micro layers in the way comparable to metals during the thermal and chemical-thermal treatments. Polybutylene terephthalate (PBT) can be found in a group of structural polymers, which are often used in industry, especially in automotive. Applying the technology of electron radiation induces a creation of 3D network structure, which improves the local mechanical properties. These were later measured by a depth sensing indentation (DSI) test. This state of the art method is based on immediate detection of indentation depth in relation to applied force. The creation of 3D network caused an increase in nano-mechanical properties values, such as indentation hardness and indentation modulus, in comparison to the virgin material. The indentation hardness rose by 80%, while the indentation modulus elevated by 62%. The selected structural materials, e.g. PBT, were modified by the electron irradiation in a positive way and as such could be moved to a group of high performance materials.

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Section: Nano-indentation Testmentioning

confidence: 99%

“…where h 1 is the indentation depth at time t 1 of reaching the test force (which is kept constant), h 2 is the indentation depth at time t 2 of holding the constant test force [12][13][14][15]. Measurement of all above mentioned properties was performed 10 times to ensure statistical correctness.…”

Section: Nano-indentation Testmentioning

confidence: 99%

Local Nano-Mechanical Properties of Cross-Linked Polybutylene

Ovsík

Staněk

Dockal

et al. 2020

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“…The dried and cooled residue was weighed again with a precision of five decimal places and compared to the original weight of the portion. The result is stated in percentage as the degree of crosslinking [14]:…”

Section: Gel Contentmentioning

confidence: 99%

Electron Radiation Effect on Indentation Creep of Construction Polymers

Ovsík

Staněk

Dockal

et al. 2020

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Cross-linking is a process in which polymer chains are associated through chemical bonds. Radiation, which penetrated through specimens and reacted with the cross-linking agent, gradually formed cross-linking (3D net), first in the surface layer and then in the total volume, which resulted in considerable changes in specimen behaviour. Creep value is an important parameter that describes the behaviour of a material for the duration of its exposure to long term stress. Most of the technical parts used in industry are subjected to the long term stress for their whole life cycle. This can lead to material creep, which directly results in the transformation of dimensions. To eliminate this problem, a number of construction materials was chosen and subsequently irradiated by a source of electrons. This created a 3D network within the polymer structure, which led to an increase of the micro-mechanical and micro-creep properties. Evaluation of these modifications was done by state of the art device Micro-combi tester manufactured by Anton Paar. This device lowers the time required to measure the creep by standard technology and it fluently records the changes of indentation depth in relation to applied force. This dependence is then used to calculate the creep values. Due to the electron irradiation, a 40 % increase was reached in creep resistance; therefore the useful properties of selected construction materials were improved.

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“…On the basis of the physicalmechanical properties test, the resulting mixture could be chosen which could meet the requirements of this polymer material when is used at the elevated temperature of this product. [5][6][7][8]…”

Section: Introductionmentioning

confidence: 99%

Influence of Mixing Recycled Polycarbonate to Charpy Impact Properties at Increased Temperature

2018

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This article deals with influence of amount of mixing recycled material with virgin polycarbonate to impact properties. The aim is to perform an experiment in which the products of the studied polymer will be grinded to recycled material and then reprocessed into new specimens. These are then subjected to Charpy impact properties at increased temperatures. Several mixtures differing in the content of recycled material in virgin polycarbonate were prepared. One mixture was from pure recycled polycarbonate. The most used technology made testing samples for production of plastic products, which is injection moulding. Testing was conducted at increased temperatures 60 °C. This temperature was choose because many products are used at this temperatures. The impact of added recycled material to virgin polypropylene not significant for all impact properties.

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Study of Nano-Creep of Unfilled and Filled Cross-Linking Polypropylene

Cited by 4 publications

References 10 publications

Local Nano-Mechanical Properties of Cross-Linked Polybutylene

Local Nano-Mechanical Properties of Cross-Linked Polybutylene

Electron Radiation Effect on Indentation Creep of Construction Polymers

Influence of Mixing Recycled Polycarbonate to Charpy Impact Properties at Increased Temperature

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