Cover Image, Volume 139, Issue 46

Nguyen, Thanh Duong; Schmidt, Thomas; Meißner, Till; Malanin, Mikhail; Uhlig, Kai; Schlendstedt, Kornelia; Schwarz, Simona; Stommel, Markus; Voit, Brigitte; Gedan-Smolka, Michaela

doi:10.1002/app.51156

Cited by 2 publications

(31 citation statements)

References 0 publications

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“…It was shown that based on DSC, the coupling degree between PA and MP1100/MP1100‐MO‐cb could be assigned: PA46 < PA12‐L1600 < PA66 < PA12‐Z7321. Additionally, SEM images agree with the DSC results 12 . The prepared chemically bonded PA‐PTFE‐oil compounds can be used as solid lubricants in metal‐plastic sliding contacts or sacrificial elements in metal–metal sliding contacts.…”

Section: Introductionsupporting

confidence: 79%

“…This fact could be due to the chemical coupling degree between PA and MP1100. Whereas the previous study by DSC (percentage of fractional crystallization) has shown that the coupling degree between MP1100 and PA types can be assigned in this order: PA12‐Z7321 (91%) > PA66 (80%) > PA12‐L1600 (52%) > PA46 (10%) 12 . In other words, it can be assumed that in PA12‐MP1100‐cb (Z7321) compounds, 91% of MP1100 is finely fragmented and dispersed in the PA12‐Z7321 matrix.…”

Section: Resultsmentioning

confidence: 81%

“…Furthermore, non‐irradiated PTFE grade MP1600 was used as a model for physical mixing with PA. An overview of the compound combinations is given in Table 3. The previous study with FTIR has shown that MP1600, despite its meager COOH end functional group, also chemically bonded to the PA matrix 12 . However, the coupling degree is deficient.…”

Section: Materials Experiment and Methodsmentioning

confidence: 98%

“…In our previous work, compounds based on PA, PTFE with the addition of olefinic oils were prepared by two‐step processing were presented 12–14 . The first step was to chemically couple radiation‐modified PTFE type MP1100 and methyl oleate by solid‐state reactive extrusion.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Wetting and friction behavior of chemically bonded PA‐PTFE‐oil compounds

Nguyen

Farshchi

Ulbricht

et al. 2023

Journal of Polymer Science

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Polyamide (PA), polytetrafluoroethylene (PTFE), and olefinic oils are incompatible. High‐energy radiation in the presence of oxygen can break the PTFE chain, generating hydrophilic functional groups (COF, COOH) and peroxy‐radicals. Based on the functional groups and radicals, it is possible to establish a chemical bond between PA and PTFE as well as between PTFE and olefinic oil molecules. This study prepared PA‐PTFE‐oil‐cb compounds (cb: chemically bonded) by reactive extrusion. The compounds wetting behavior are analyzed by contact angle measurement. Additionally, the sliding properties of the compound are investigated by micro friction testing against stainless steel. Due to good fragmentation and dispersion of PTFE in PA12 matrix, the PA12‐MP1100‐cb and PA12‐MP1100‐MO‐cb compounds show a slight change in wetting behavior compared to virgin PA12. In contrast, the wetting behavior of compounds based on PA46 increases dramatically compared to virgin PA46. Moreover, due to the chemical bonding, the PA‐PTFE‐cb compound surface is significantly smoother than a physical blend used as a model compound. Similarly, the compounds based on PA12 and PA66‐matrix show improved tribological properties compared to PA46‐based compounds. COF values for PA66 and PA12‐Z7321 are 0.69 and 0.55, respectively. In comparison, PA66‐MP1100‐MO‐cb and PA12‐MP1100‐MO‐cb (Z7321) have COF value of 0.34 and 0.38, respectively.

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Section: Introductionsupporting

confidence: 79%

Section: Resultsmentioning

confidence: 81%

Section: Materials Experiment and Methodsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Wetting and friction behavior of chemically bonded PA‐PTFE‐oil compounds

Nguyen

Farshchi

Ulbricht

et al. 2023

Journal of Polymer Science

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The crystallinity of chemically bonded PA‐PTFE‐oil compounds by X‐ray diffraction and DSC

Nguyen

Farshchi

Ulbricht

et al. 2023

Journal of Polymer Science

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One of the major shortcomings of compounding polyamide (PA), polytetrafluoroethylene (PTFE), and olefinic oils is the fact that they are incompatible. To overcome this issue, using energy radiation in the presence of oxygen leads to the breakage of the PTFE chain to generate hydrophilic functional groups (COF, COOH) and peroxy radicals. The created functional groups and radicals can be used to induce a chemical bond between PA and PTFE as well as between PTFE and olefinic oil molecules. In addition, the hardness of compounds significantly influences the application of materials as solid‐lubricant. It is well known that crystallinity affects the hardness of materials. In the presented study, the effects of the chemical bonding PA‐PTFE/PA‐PTFE‐oil on the crystallization behavior of various types of PA in chemically bonded PA‐PTFE‐oil‐chemically bonded compounds, which were prepared by reactive two‐step extrusion, were investigated via DSC and X‐ray diffraction. The crystallite size of PA46 and PA66 in PA‐PTFE‐chemically bonded (cb) compounds was significantly increased compared with pure PA. At the same time, the d‐spacings of the PA segment in PA‐PTFE compounds were significantly narrower. Due to the chemical coupling, the compounds showed a slight change in hardness compared with pure PA.

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Cover Image, Volume 139, Issue 46

Cited by 2 publications

References 0 publications

Wetting and friction behavior of chemically bonded PA‐PTFE‐oil compounds

Wetting and friction behavior of chemically bonded PA‐PTFE‐oil compounds

The crystallinity of chemically bonded PA‐PTFE‐oil compounds by X‐ray diffraction and DSC

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