Structure-property effects on mechanical, friction and wear properties of electron modified PTFE filled EPDM composite

Khan, Mohammad Sohail; Lehmann, D.; Heinrich, Gert; Gohs, Uwe; Franke, R.

doi:10.3144/expresspolymlett.2009.7

Cited by 28 publications

(22 citation statements)

References 13 publications

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“…Influence of electron beam (EB) on PP under static conditions is well known in the literature [13][14][15][16] and characterises a process where required absorbed dose is applied to form parts (after molding) in solid state and at room temperature. EB cross-linking of EPDM rubber under static conditions is also reported by several authors [17][18][19]. The absorbed dose controls the energy input per unit of mass as well as the total number of radicals.…”

Section: Introductionsupporting

confidence: 54%

PP-EPDM thermoplastic vulcanisates (TPVs) by electron induced reactive processing

Naskar

Gohs²,

Wagenknecht³

et al. 2009

Express Polym. Lett.

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Abstract. Reactive processing combines melt mixing process and chemical reaction simultaneously. TPVs are produced by such reactive processing. Polymer modification with high energy electrons is based on generation of excited atoms or molecules and ions for subsequent molecular changes via radical induced chemical reactions. In the present study, electron induced reactive processing is used for the development of TPVs. A 1.5 MeV electron accelerator was directly coupled to an internal mixer in order to induce chemical reactions by energy input via high energy electrons under dynamic conditions of melt mixing of polypropylene (PP) and ethylene propylene diene monomer rubber (EPDM). The influence of absorbed dose (25 to 100 kGy) as well as electron energy (1.5 and 0.6 MeV) and electron treatment time (15 to 60 s) have been studied. Increased values of both tensile strength and elongation at break of the TPVs indicate in-situ compatibilisation of PP and EPDM as well as cross-linking in the EPDM phase upon electron induced reactive processing. Dynamic mechanical analyses showed a decrease in value of glass transition temperature peak of EPDM in tangent delta curve with increasing dose. This also indicates higher degree of cross-linking in EPDM phase, which is further supported by a gel content that is higher than the EPDM content itself in the blend.

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Section: Introductionsupporting

confidence: 54%

PP-EPDM thermoplastic vulcanisates (TPVs) by electron induced reactive processing

Naskar

Gohs²,

Wagenknecht³

et al. 2009

Express Polym. Lett.

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“…In recent years, research have focused on developing surface-modified engineering polymers and nano-composites because of new technology that enhances the tribological behavior by changing the molecular or matrix structure to change the surface or bulk properties (Brostow et al, 2010;Khan et al, 2009). Plastics are often reinforced with fillers, additives, binders, and very recently researchers have shed light on adopting electroplating as a technique for enhancing the strength of materials.…”

Section: Introductionmentioning

confidence: 99%

Comparison of wear behavior of ABS and ABS composite parts fabricated via fused deposition modelling

Sudin

2018

Int. j. adv. appl. sci.

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Since, the material wear is an important phenomenon influencing the functionality of a part, this research was carried with the aims to study the friction and wear behaviour of parts made of ABS composite material by FDM. This study also compare the friction and wear behaviour of ABS composite with the existing acrylonitrile butadiene styrene (ABS) filament of the FDM machine. The experiment was carried out on the pin-on-disk apparatus according to ASTM G99-04 standard under dry sliding condition that were carried out at room temperature. The load was varied (5, 10, 15 and 20 N) at speed of 286 RPM for the run time of 3 and 5 minutes. The results shown that the applied load and run time significantly affect the wear rate, friction force and friction coefficient of the test samples. Based on the experiment, carbon fiber reinforced ABS specimens showed better wear resistance and durability comparing to pure ABS specimens. This research could be useful to develop a better wear resistance component for various fields of applications.

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“…There have been initiatives to find the correlation between the wear behaviour and the mechanical properties of polymers, but difficult or weak correlations have been found, primarily because of the limited condition of the wear systems and the selected material families [15][16][17][18]. In recent years, research has focused on the surface-modified engineering polymers and nano-composites because of new technology that enhances the tribological behaviour by changing the molecular or matrix structure to change the surface or bulk properties [19][20][21].…”

mentioning

confidence: 99%

An engineering approach to dry friction behaviour of numerous engineering plastics with respect to the mechanical properties

Kalácska¹

2013

Express Polym. Lett.

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The effect of friction on the wear of engineering polymers is a complex and intricate consequence of the micro-and macroscopic interactions of surfaces moving against one another. Friction and the resulting wear are not material properties of plastics; therefore, they cannot be reduced to tabular data of material characteristics that can be found in relevant manuals. Determining friction and the resulting wear involves more complex examination because they are characteristics of a frictional contact system where the effects of the entire system are manifest. Precise knowledge of system conditions is essential to evaluate the friction and resulting wear [1]. These materials have system-dependent tribological behaviour; thus, trends can be defined at a given condition, and the materials can be compared. The system approach is well-known from the literature [2, 199 An engineering approach to dry friction behaviour of numerous engineering plastics with respect to the mechanical properties G. Kalácska Abstract. Twenty-one different commercial-grade engineering polymers, including virgin and composite types, were selected for testing, based on mechanical engineering practices. Three groups were formed according to typical applications: 1) Sliding machine element materials; 2) Mechanically load-carrying machine element materials that are often subjected to friction and wear effects; and 3) Additional two amorphous materials used as chemically resistant materials that have rare sliding load properties. The friction running-in state was tested using a dynamic pin-on-plate test rig. During steady-state friction tests, two pv regimes (0.8 and 2 MPa"ms -1 ) were analysed by a pin-on-disc test system. Based on the measured forces on ground structural steel, surface friction coefficients were calculated and analysed with respect to the mechanical effects of friction. The friction results were evaluated by the measured mechanical properties: yield stress, Shore D hardness, Young's modulus and elongation at the break. The three material groups exhibited different trends in friction with respect to changing mechanical properties. Linear (with varying positive and negative slopes), logarithmic and exponential relationships were observed, and occasionally there were no effects observed. At steady-state friction, the elongation at the break had less effect on the friction coefficients. The dynamic sliding model, which correlates better to real machine element applications, showed that increasing hardness and yield stress decreases friction. During steady-state friction, an increase in pv regime often changed the sign of the linear relationship between the material property and the friction, which agrees with the frictional theory of polymer/steel sliding pairs.

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Structure-property effects on mechanical, friction and wear properties of electron modified PTFE filled EPDM composite

Cited by 28 publications

References 13 publications

PP-EPDM thermoplastic vulcanisates (TPVs) by electron induced reactive processing

PP-EPDM thermoplastic vulcanisates (TPVs) by electron induced reactive processing

Comparison of wear behavior of ABS and ABS composite parts fabricated via fused deposition modelling

An engineering approach to dry friction behaviour of numerous engineering plastics with respect to the mechanical properties

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