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Study of the influence of nanoparticles on the performance and the properties of polyamide 6

von Dr. Mohammad Reza Sarbandi

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[1.] Mrs/Fragment 029 11 - Diskussion
Zuletzt bearbeitet: 2015-04-19 18:53:35 WiseWoman
BauernOpfer, Fragment, Gesichtet, Mahfuz et al 2008, Mrs, SMWFragment, Schutzlevel sysop

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Untersuchte Arbeit:
Seite: 29, Zeilen: 11-23
Quelle: Mahfuz et al 2008
Seite(n): 27, Zeilen: 27 ff.
Polyamide’s toughness, low coefficient of friction and good abrasion resistance make it an ideal replacement for a wide variety of applications, replacing metal and rubber. The amide groups of polyamide are very polar, and hydrogen bonds can form between them. Because of these, and because the polyamide backbone is so regular and symmetrical, polyamides are often crystalline, and make very good fibers [107]. When polyamide is spun into fibers, the long chainlike macromolecules line up parallel to each other. The amide groups on adjacent chains then form strong bonds with each other called bridged hydrogen bonds. These hydrogen bonds hold the adjacent chains together, making polyamide yarn strong. When polyamide 6 polymerizes, the amide link present in caprolactam (starting monomer for polyamide 6) opens up and the molecules join up in a continuous chain, providing an ideal mechanism for interacting with nanoparticles. On the other hand, silica particles are formed by strong covalent bonds between silicon and oxygen atoms by sharing their electron pairs at the p orbital. The surface bound OH groups on the silica surfaces may also form stable bonds with polyamide during polymerization.

[107] H. Mahfuz, M. Hasan, V. Dhanak, Nanotechnology 19 (2008) 445702 (7pp)

Nylon’s toughness, low coefficient of friction and good abrasion resistance make it an ideal replacement for a wide variety of applications replacing metal and rubber. The amide groups of nylon are very polar, and can hydrogen bond with each other. Because of these, and because the nylon backbone is so regular and symmetrical, nylons are partially crystalline, and they make very good fiber [22-26].[...] When nylon is spun into fibers, the long chain-like macromolecules line up parallel to each other. The amide groups on adjacent chains then form strong bonds with each other called hydrogen bonds. These hydrogen bonds hold the adjacent chains together, making nylon yarn strong. When nylon-6 polymerizes, the amide link present in Caprolactam (starting monomer for nylon-6) opens up and the molecules join up in a continuous chain providing an ideal mechanism for interacting with nanoparticles. On the other hand, silica particles are formed by strong covalent bonds between silicon and oxygen atoms by sharing their electron pairs at the p orbitals. In addition, the surface bound OH groups on silica surfaces offer an opportunity to form stable bonds with nylon or any functional group during polymerization.

[22] Kohan M. I, editor. Nylon Plastics, John Wiley & Sons, New York 1973, p.3-4.

[23] Fornes TD, Paul D.R., Polymer, 44, 3945, ., 2003

[24] Kim, Young, Materials Research Society Symposium - Proceedings, 2002, V740, 441

[25] Zhang, Wei-De, Macromolecular Rapid Communications, 2004,V 25, n 21, 1860.

[26] Jin L, Bower C, Zhou O. Appl Phys, 1998 Lett, 73, 1197.

Anmerkungen

The source is mentioned (the source used for documentation here and the source given both contain the section used here). It does not become clear, however, that the entire passage has been taken from the source.

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(Hindemith), SleepyHollow02


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