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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 013 01 - Diskussion
Zuletzt bearbeitet: 2015-05-16 19:52:43 WiseWoman
BauernOpfer, Fragment, Garcia et al 2004, Gesichtet, Mrs, SMWFragment, Schutzlevel sysop

Typus
BauernOpfer
Bearbeiter
SleepyHollow02
Gesichtet
Yes.png
Untersuchte Arbeit:
Seite: 13, Zeilen: 1-4
Quelle: Garcia et al 2004
Seite(n): 169, Zeilen: abstract
There was no noticeable improvement of the mechanical properties when powder silica was added to the pure polymer. On the contrary, the presence of silica-sol nano-particles in the polymer matrix led to an increase of both Young modulus and impact strength, from 1.2 GPa to 1.6 GPa and from 3.4 kJ/m2 to 5.7 kJ/m2, respectively. There was no noticeable improvement of the mechanical properties when powder silica was added to the pure polymer. On the contrary, the presence of silica-sol nano-particles in the polymer matrix led to an increase of both Young modulus and impact strength, from 1.2 GPa to 1.6 Gpa and from 3.4 kJ/m2 to 5.7 kJ/m2 respectively.
Anmerkungen

The passage starts on the previous page: Mrs/Fragment 012 25

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

Sichter
(SleepyHollow02), (Hindemith), WiseWoman

[2.] Mrs/Fragment 013 06 - Diskussion
Zuletzt bearbeitet: 2015-04-25 22:30:09 WiseWoman
Fragment, Gesichtet, Mrs, SMWFragment, Schutzlevel sysop, Verschleierung, Yao and Yang 2010

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Verschleierung
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Klgn
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Untersuchte Arbeit:
Seite: 13, Zeilen: 6-22
Quelle: Yao and Yang 2010
Seite(n): 492, Zeilen: r. Sp.; 6-11; Abstract
Poly (trimethylene terephthalate) (PTT) is a relatively new type of linear aromatic polyester. During recent decades, it has attracted attention not only because of its excellent mechanical and electrical properties, but also because one of its raw materials, 1,3-propanediol, is a renewable resource, which can be derived from renewable materials such as corn and starch. The sol–gel technique has provided promising opportunities for the preparation of polymer/inorganic hybrid materials at the molecular level, which ensures the inorganic particles, are well dispersed in the organic matrix. In this study [38], poly (trimethylene terephthalate) (PTT)/silica nanocomposites were fabricated via the sol–gel technique and in-situ polycondensation. Fourier transform infrared and nuclear magnetic resonance analyses confirmed that some PTT molecular chains were grafted to the surface of silica. Unlike pure PTT, the grafted PTT was insoluble in a mixed solvent of chloroform and hexafluoro-2-propanol. Both transmission electron microscopy and scanning electron microscopy showed that the silica particles, with a size of 40–50 nm, were homogeneously dispersed in the PTT matrix with no preferential accumulation in any region. Differential scanning calorimetry revealed that the glass transition temperature and cold-crystallization peak of the composites gradually increased with increasing silica loading. A simultaneous increase of stiffness and toughness was observed for the concentration of nanocomposites.

[38] ISO 2076, AUSG. 12.89: Generic names for man-made fibers. International Organization for Standardization

Poly(trimethylene terephthalate) (PTT) is a relatively new type of linear aromatic polyester. During recent decades, it has attracted attention not only because of its excellent mechanical and electrical properties, 20 but also because one of its raw materials, 1,3-propanediol, is a renewable resource, which can be derived from renewable materials such as corn and starch.

[Abstract]

The sol–gel technique has provided promising opportunities for the preparation of polymer/inorganic hybrid materials at the molecular level, which ensures the inorganic particles are well dispersed in the organic matrix. In this work, poly(trimethylene terephthalate) (PTT)/silica nanocomposites were fabricated via the sol–gel technique and in situ polymerization. Fourier transform infrared and nuclear magnetic resonance analyses confirmed that some PTT molecular chains were grafted to the surface of silica. Unlike pure PTT, the grafted PTT was insoluble in a mixed solvent of chloroform and hexafluoro-2-propanol. Both transmission electron microscopy and scanning electron microscopy showed that the silica particles, with a size of 40–50 nm, were homogeneously dispersed in the PTT matrix with no preferential accumulation in any region. Differential scanning calorimetry revealed that the glass transition temperature and cold-crystallization peak of the composites gradually increased with increasing silica loading. A simultaneous increase of stiffness and toughness was observed for the nanocomposites.


[20] Wu J, Schultz JM, Samon JM, Pangelinan AB and Chuah HH, Polymer 42:7141 (2001).

Anmerkungen
Sichter
(SleepyHollow02)

[3.] Mrs/Fragment 013 25 - Diskussion
Zuletzt bearbeitet: 2015-04-25 22:41:22 WiseWoman
Bhattacharya et al. 2008, Fragment, Gesichtet, Mrs, SMWFragment, Schutzlevel sysop, Verschleierung

Typus
Verschleierung
Bearbeiter
Klgn
Gesichtet
Yes.png
Untersuchte Arbeit:
Seite: 13, Zeilen: 25-31
Quelle: Bhattacharya et al. 2008
Seite(n): 28; 29, Zeilen: 28: 27 ff.; 29: 3-4; 28: 8 ff.
Polyurethane (PU) is becoming increasingly important as an engineering material because it has excellent abrasion resistance and displays properties of both elastomers and plastics. Wang and Pinnavaia [29] have synthesized intercalated nanocomposites based on elastomeric polyurethane. Khudyakov and Zopf [49] also studied the effect of colloidal silica and organoclays on properties of PU. The studies on epoxy systems considered the ring opening polymerization of epoxides to form polyether nanocomposites. Studies [30, 31] of both rubbery and glassy epoxy/clay nanocomposites using different type of amine curing agents were [conducted and the mechanisms leading to the mono-layer exfoliation of clay layers in thermoset epoxy systems were elucidated.]

[30] P.B., Messersmith, E.P. Giannelies, Chemical Matterial 6, (1994), 1719-1725

[31] T. Lan, T.J. Pinnavaia, Chemical Materials, 6, 1994, 2216- 2219

[page 28]

Polyurethane (PU) is becoming increasingly important as an engineering material because it has excellent abrasion resistance and displays properties of both elastomers and plastics.

[page 29]

[Wang and Pinnavaia (1998)] have synthesized intercalated nanocomposites based on elastomeric polyurethanes.

[page 28]

The studies on epoxy systems considered the ring opening polymerization of epoxides to form polyether nanocomposites. Studies of both rubbery and glassy epoxy/clay nanocomposites using different types of amine curing agents were conducted and the mechanisms leading to the monolayer exfoliation of clay layers in thermoset epoxy systems were elucidated.

Anmerkungen
Sichter
(Klgn), SleepyHollow02


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