Newly developed chloroprene rubber composites based on electron-modified polytetrafluoroethylene powder

Khan, Mohammad Sohail; Lehmann, D.; Heinrich, Gert

doi:10.1016/j.actamat.2009.06.043

Cited by 13 publications

(3 citation statements)

References 17 publications

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“…The friction surface consists of PTFE-PTFE contacts when forming a transfer film on the opposite surface, providing low friction. A number of studies show the application of PTFE as an internal solid lubricant for some polymers and demonstrate that the friction and wear-resistant properties of polymer matrices filled with PTFE are increased [7,[17][18][19][20][21][22][23][24][25]. The high molecular weight and chemically inert surface of PTFE limit its use as an effective filler in polymer matrices, including elastomeric ones.…”

Section: Introductionmentioning

confidence: 99%

“…The high molecular weight and chemically inert surface of PTFE limit its use as an effective filler in polymer matrices, including elastomeric ones. The low surface energy of PTFE causes poor wetting and adhesion, which makes it difficult to uniformly disperse and chemically bond PTFE powder to rubber [23][24][25]. Special compounding processes have been developed to reduce the fibrillation effect and facilitate the dispersion of high-molecular-weight PTFE in elastomers.…”

Section: Introductionmentioning

confidence: 99%

“…It is known that high-energy gamma radiation and electron beam radiation affect the physical and mechanical properties of PTFE [27][28][29][30]. For instance, radiation-treated PTFE exhibits a better reinforcing effect than non-irradiated PTFE in polar systems [23]. Khan et al [24,25] and Cao et al [26] report that high-energy irradiation reduces the energy required to produce PTFE powder from its waste and results in a powder that does not agglomerate.…”

Section: Introductionmentioning

confidence: 99%

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Wear-Resistant Elastomeric Composites Based on Unvulcanized Rubber Compound and Recycled Polytetrafluoroethylene

Ayurova,

Kornopoltsev,

Khagleev

et al. 2024

Lubricants

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Advancements in industrial machinery and manufacturing equipment require more reliable and efficient polymer tribo-systems which operate in conditions associated with increasing machine speeds and a lack of cooling oil. The goal of the current research is to improve the tribological properties of elastomeric composites by adding a solid lubricant filler in the form of ultrafine polytetrafluoroethylene (PTFE) with the chemical formula [C2F4]n and recycled polytetrafluoroethylene (r-PTFE) powders. PTFE waste is recycled mechanically by abrasion. The elastomeric composites are prepared by mixing a nitrile butadiene rubber with a phenol-formaldehyde resin and PTFE powders in an extruder followed by rolling. The deformation-strength and tribological tests of r-PTFE elastomeric composites are conducted in comparison with the ultrafine PTFE composites. The latter is based on products of waste fluoropolymer processing using a radiation method. The deformation-strength test shows that the introduction of ultrafine PTFE and r-PTFE powder to the composite leads to a decrease in strength and elongation at break, which is associated with the poor compatibility of additives and the elastomeric matrix. The friction test indicates a decrease in the coefficient of friction of the composite material. It is determined that the 15 wt.% filler added in the elastomeric matrix leads to a reduction in the wear rate by 20%. The results obtained show the possibility of using ultrafine PTFE powder and r-PTFE for creating elastomeric composites with increased tribological properties. These research results are beneficial for rubber products used in many industries, mainly in mechanical engineering.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Wear-Resistant Elastomeric Composites Based on Unvulcanized Rubber Compound and Recycled Polytetrafluoroethylene

Ayurova,

Kornopoltsev,

Khagleev

et al. 2024

Lubricants

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Preparation and properties of polytetrafluorethylene filled ethylene–propylene–diene monomer composites

Zhao

Shi

et al. 2011

J of Applied Polymer Sci

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Ethylene-propylene-diene monomer/polytetrafluorethylene (EPDM/PTFE) composites based on EPDM and electron beam irradiated PTFE powders (MS-II, MS-III, and MS-V, with mean diameter 5 lm, 1 lm, and 0.1 lm, respectively) were prepared by a mechanical compounding technique. The curing characteristics, morphologies, mechanical properties, and abrasion behaviors of these composites were investigated. The curing measurements indicated that the addition of lower loading of MS-III or MS-V enhanced the lubrication of EPDM compounds and delayed the curing process. The morphological structure of the composites demonstrated that the MS-III and MS-V were uniformly dispersed in EPDM matrix and the efficient polymer-filler interfacial interactions were constructed. In comparison with EPDM/MS-II and EPDM/ MS-III, EPDM/MS-V exhibited outstanding tensile strength, tear strength, elongation at break, and abrasion resistance due to the nanometer particle dimension and good dispersion of MS-V as well as the stronger interfacial interactions between MS-V and the EPDM matrix.

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Recycling and application of wasted polytetrafluoroethylene via high-energy ball milling technology for nitrile rubber composites preparation

Cao

Liu

et al. 2016

Polym Eng Sci

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Wasted polytetrafluoroethylene fibers were recycled using high-energy ball milling technique, and the recylced polytetrafluoroethylene (r-PTFE) was employed to prepare nitrile rubber (NBR)/r-PTFE composites. The structure of r-PTFE and properties of NBR/r-PTFE composites were investigated by polarized optical microscope, laser particle size analyzer, differential scanning calorimetry, and scanning electron microscopy, respectively. The results show that increasing the milling time from 4 to 7 h leads to decreasing the average particle size, the degree of crystallinity and the number-average molecular weight of r-PTFE, whereas no obvious change is found by further prolonging the milling time. It is also clear that the NBR/r-PTFE composite with the r-PTFE obtained from a longer milling time possesses a higher mechanical and solvent resistance property. Compared with pure NBR, NBR/r-PTFE composites with r-PTFE for 7 h milling show a 21.9% increase in modulus at 300% and 27.8% decrease in swelling index. POLYM. ENG. SCI., 56:643-649, 2016.

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Newly developed chloroprene rubber composites based on electron-modified polytetrafluoroethylene powder

Cited by 13 publications

References 17 publications

Wear-Resistant Elastomeric Composites Based on Unvulcanized Rubber Compound and Recycled Polytetrafluoroethylene

Wear-Resistant Elastomeric Composites Based on Unvulcanized Rubber Compound and Recycled Polytetrafluoroethylene

Preparation and properties of polytetrafluorethylene filled ethylene–propylene–diene monomer composites

Recycling and application of wasted polytetrafluoroethylene via high-energy ball milling technology for nitrile rubber composites preparation

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