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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 012 01 - Diskussion
Zuletzt bearbeitet: 2015-05-16 20:09:53 WiseWoman
Ahn et al 2004, BauernOpfer, Fragment, Gesichtet, Mrs, SMWFragment, Schutzlevel sysop

Typus
BauernOpfer
Bearbeiter
Hindemith
Gesichtet
Yes.png
Untersuchte Arbeit:
Seite: 12, Zeilen: 1-3
Quelle: Ahn et al 2004
Seite(n): 812, Zeilen: abstract
[The torque and total torque values of the composites decreased with increasing] silica nanoparticle content. The tensile modulus of the composites reinforced with unmodified silica nanoparticles increased with increasing silica content, whereas the tensile strength and elongation decreased. The torque and total torque values of the composites decreased with increasing silica nanoparticle content. The tensile moduli of the composites reinforced with unmodified silica nanoparticles increased with increasing silica content, whereas the tensile strength and elongation decreased.
Anmerkungen

The source is mentioned on the previous page and it is clear that the results of the mentioned authors are described. It is not clear, however, that the abstract of the source has been copied verbatim.

The passage starts on the previous page: Mrs/Fragment 011 21

Sichter
(Hindemith), WiseWoman

[2.] Mrs/Fragment 012 05 - Diskussion
Zuletzt bearbeitet: 2015-04-19 19:06:04 WiseWoman
BauernOpfer, Fragment, Gesichtet, Mrs, SMWFragment, Schutzlevel sysop, Sertchook et al 2007

Typus
BauernOpfer
Bearbeiter
Hindemith
Gesichtet
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Untersuchte Arbeit:
Seite: 12, Zeilen: 5-21
Quelle: Sertchook et al 2007
Seite(n): 98, Zeilen: abstract
Polyethylene (PE) and silica are perhaps the simplest and most common organic and inorganic polymers, respectively. Sertchook et al. [27] describe, for the first time, a physically interpenetrating nanocomposite between these two elementary polymers. While polymer-silica composites are well known, the nanometric physical blending of PE and silica has remained a challenge. A method for the preparation of such materials, which is based on the entrapment of dissolved PE in a polymerizing tetraethoxysilane (TEOS) system, has been developed. Specifically, the preparation of submicron particles of low-density PE at silica and high-density PE at silica is detailed, which is based on carrying out a silica sol-gel polycondensation process within emulsion droplets of TEOS dissolved PE, at elevated temperatures. The key to the successful preparation of this new composite has been the identification of a surfactant, PE-b- PEG, that is capable of stabilizing the emulsion and promoting the dissolution of the PE. A mechanism for the formation of the particles as well as their inner structure are proposed, based on a large battery of analyses, including transmission electron microscopy (TEM) and scanning electron microscopies (SEM), surface area and porosity analyses, various thermal analyses including thermal gravimetric analysis (TGA/DTA) and differential scanning calorimetry (DSC) measurements, small-angle X-ray scattering (SAXS) measurements and solid-state NMR spectroscopy.

[27] H.Sertchook, Hi. Elimelech, C. Makarov, R. Khalfin, Journal of the American Chemical Society. 2007, 129, 98-108

Polyethylene (PE) and silica are perhaps the simplest and most common organic and inorganic polymers, respectively. We describe, for the first time, a physically interpenetrating nanocomposite between these two elementary polymers. While polymer-silica composites are well known, the nanometric physical blending of PE and silica has remained a challenge. A method for the preparation of such materials, which is based on the entrapment of dissolved PE in a polymerizing tetraethoxysilane (TEOS) system, has been developed. Specifically, the preparation of submicron particles of low-density PE@silica and high-density PE@silica is detailed, which is based on carrying out a silica sol-gel polycondensation process within emulsion droplets of TEOS dissolved PE, at elevated temperatures. The key to the successful preparation of this new composite has been the identification of a surfactant, PE-b-PEG, that is capable of stabilizing the emulsion and promoting the dissolution of the PE. A mechanism for the formation of the particles as well as their inner structure are proposed, based on a large battery of analyses, including transmission electron microscopy (TEM) and scanning electron microscopies (SEM), surface area and porosity analyses, various thermal analyses including thermal gravimetric analysis (TGA/DTA) and differential scanning calorimetry (DSC) measurements, small-angle X-ray scattering (SAXS) measurements and solid-state NMR spectroscopy.
Anmerkungen

The source is mentioned, but it is not clear that the entire paragraph is taken from it verbatim.

Sichter
(Hindemith), SleepyHollow02

[3.] Mrs/Fragment 012 25 - Diskussion
Zuletzt bearbeitet: 2015-05-16 19:48:52 WiseWoman
BauernOpfer, Fragment, Garcia et al 2004, Gesichtet, Mrs, SMWFragment, Schutzlevel sysop

Typus
BauernOpfer
Bearbeiter
SleepyHollow02
Gesichtet
Yes.png
Untersuchte Arbeit:
Seite: 12, Zeilen: 25-32
Quelle: Garcia et al 2004
Seite(n): 169, Zeilen: abstract
M. Garcia et al. [55] have reported preparation of Polypropylene-SiO2 nanocomposites using twin-screw extruders. The properties of the nanocomposites were studied using two different inorganic fillers: colloidal (sol) and powdered silica nanoparticles. Reinforcing and toughening effects of the nanoparticles on the polymer matrix were found at a loading of 4.5 wt. %, which is lower than for most particulate filled composites. The use of silica nanoparticles led to different microstructure when compared with that of the pure polymer. Addition of colloidal silica to the polymer matrix produced good filler dispersion while the use of powdered silica resulted in aggregated silica particles in the polymer [matrix.]

[55] M.Garcia, G.van Vliet, S.Jain, Review on Advanced Materials Science 6 (2004) 169- 175 PP

Polypropylene-SiO2 nanocomposites were synthesized using twin-screw extruders. The properties of the nanocomposites were studied using two different inorganic fillers: colloidal (sol) and powder silica nanoparticles. Reinforcing and toughening effects of the nanoparticles on the polymer matrix were found at a loading of 4.5 wt.%, which is lower than for most particulate filled composites. The use of silica nanoparticles led to different microstructure when compared with that of the pure polymer. Addition of colloidal silica to the polymer matrix produced good filler dispersion while the use of powder silica resulted in aggregated silica particles in the polymer matrix.
Anmerkungen

The source is given, but it is not clear to the reader that simply the abstract of the paper described has been copied. The reference given is also incomplete.

Sichter
(SleepyHollow02), (Hindemith), WiseWoman


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