Crystal modulus of a new semiaromatic polyamide 9‐T

Uddin, Ahmed Jalal; Gotoh, Yasuo; Ohkoshi, Yutaka; Nishino, Takashi; Endo, Ryosuke

doi:10.1002/pen.22086

Cited by 12 publications

(13 citation statements)

References 24 publications

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“…This is a semi-aromatic polyamide which contains a long flexible aliphatic linkage containing nine methylene groups incorporated in the main chain that allow one to obtain a lower melting temperature. PA 9T possesses good temperature stability, high temperature-moisture resistance, low water absorption and a good resistance to acid, alkali, organic solvents and hot water [28,29].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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This study describes the effect of electron radiation on the nano-mechanical properties of surface layers of selected polyamide (PA) types. Electron radiation initiates the cross-linking of macromolecules in the polyamide structure, leading to the creation of a 3D network which fundamentally changes the properties of the tested polymers. Selected types of polyamide (PA 6, PA 66 and PA 9T) were exposed to various intensities of electron radiation (33 kGy, 66 kGy, 99 kGy, 132 kGy, 165 kGy and 198 kGy). The cross-linked polyamides’ surface properties were measured by means of the modern nano-indentation technique (Depth Sensing Indentation; DSI), which operates on the principle of the immediate detection of indenter penetration depth in dependence on the applied load. The evaluation was preformed using the Oliver–Pharr method. The effect of electron radiation on the tested polyamides manifested itself in the creation of a 3D network, which led to an increase of surface layer properties, such as indentation hardness, elastic modulus, creep and temperature resistance, by up to 93%. The increase of temperature and mechanical properties substantially broadens the field of application of these materials in technical practice, especially when higher temperature resistance is required. The positive changes to the nano-mechanical properties as well as mechanical and temperature capabilities instigated by the cross-linking process were confirmed by the gel volume test. These measurements lay the foundation for a detailed study of this topic, as well as for a more effective means of modifying chosen properties of technical polyamide products by radiation.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…Due to these properties, PA9T is used in electrical, electronic, and automobile parts. Due to production factors, its fiber is also now used for the production of fishing nets and other industrial and textile materials [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Irradiation on Mechanical and Thermal Properties of Selected Types of Polymers

et al. 2018

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This article deals with the influence of electron-beam radiation on the micro-mechanical, thermo-mechanical, and structural properties of selected polymers. In the search for the desired improvement of polymers, it is possible to use, inter alia, one particular possible modification-Namely, crosslinking-Which is a process during which macromolecular chains start to connect to each other and, thus, create the spatial network in the structure. In the course of the treatment of the ionizing radiation, two actions can occur: crosslinking and scission of macromolecules, or degradation. Both these processes run in parallel. Using the crosslinking technology, standard and technical polymers can acquire the more "expensive" high-tech polymeric material properties and, thus, replace these materials in many applications. The polymers that were tested were selected from across the whole spectra of thermoplastics, ranging from commodity polymers, technical polymers, as well as high-performance polymers. These polymers were irradiated by different doses of beta radiation (33, 66, 99, 132, 165, and 198 kGy). The micro-mechanical and thermo-mechanical properties of these polymers were measured. When considering the results, it is obvious that irradiation acts on each polymer differently but, always when the optimal dose was found, the mechanical properties increased by up to 36%. The changes of micro-mechanical and thermo-mechanical properties were confirmed by structural measurement when the change of the micro-hardness and modulus corresponded to the crystalline phase change as determined by X-ray and gel content.

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“…Furthermore, the gel test indicated, that the PA6 enriched by TAC started the crosslinking process even after being exposed to relatively low amounts of radiation. The contents of absorbed water declined with increasing amounts of TAC and the absorbed levels of radiation doses [5][6][7][8][9].…”

Section: Introductionmentioning

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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Crystal modulus of a new semiaromatic polyamide 9‐T

Cited by 12 publications

References 24 publications

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

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

The Effect of Irradiation on Mechanical and Thermal Properties of Selected Types of Polymers

Electron Radiation Effect on Indentation Creep of Construction Polymers

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