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Characterization and control of exfo...

Marchant, Darrell.

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Characterization and control of exfoliation in melt-processed nanocomposites of polypropylene and clay.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Characterization and control of exfoliation in melt-processed nanocomposites of polypropylene and clay./
Author:	Marchant, Darrell.
Description:	118 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-12, Section: B, page: 6205.
Contained By:	Dissertation Abstracts International64-12B.
Subject:	Engineering, Chemical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3116002
ISBN:	0496634388

Characterization and control of exfoliation in melt-processed nanocomposites of polypropylene and clay.
Marchant, Darrell.

Characterization and control of exfoliation in melt-processed nanocomposites of polypropylene and clay. - 118 p.

Source: Dissertation Abstracts International, Volume: 64-12, Section: B, page: 6205.

Thesis (Ph.D.)--Michigan State University, 2003.

This investigation is focused on the structure of melt-processed nanocomposites of polypropylene and montmorillonite clay or layered silicates and on the effectiveness of polymer compatibilizers in producing exfoliated structures. Several grades of PP-g-MA have been analyzed and combined in varying amounts with the same bulk polypropylene and 5 wt% of organically modified layered silicates. The resulting nanocomposites have been analyzed with x-ray diffraction, transmission electron microscopy and melt rheology. The extent of delamination in different nanocomposites has been quantified from analysis of several TEM images for each specimen by a product of the single particle volume fraction and the intrinsic viscosity of such particles. This measure correlated directly with the low shear relative viscosity of the molten composites (relative to the silicate free mixture of polypropylene and compatibilizer) and thus provides a quantitative index of the level of exfoliation of the clay. The results also indicate that the acid number alone is not a good predictor of compatibilizer effectiveness---i.e. the amount required for exfoliation. The most exfoliated nanocomposite was obtained with the compatibilizer that had the largest amount of covalently bound maleic anhydride, which is located predominantly at the ends of the PP-g-MA chain in an oligomeric graft. In addition, the wt. average molecular weight of the PP-g-MA is also significant for producing exfoliated structures by melt processing because sufficient stresses must be generated to slide the nanolayers apart.

ISBN: 0496634388Subjects--Topical Terms:

1018531
Engineering, Chemical.

Characterization and control of exfoliation in melt-processed nanocomposites of polypropylene and clay.
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245 1 0 $a Characterization and control of exfoliation in melt-processed nanocomposites of polypropylene and clay.
300 $a 118 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-12, Section: B, page: 6205.
500 $a Adviser: Krishnamurthy Jayaraman.
502 $a Thesis (Ph.D.)--Michigan State University, 2003.
520 $a This investigation is focused on the structure of melt-processed nanocomposites of polypropylene and montmorillonite clay or layered silicates and on the effectiveness of polymer compatibilizers in producing exfoliated structures. Several grades of PP-g-MA have been analyzed and combined in varying amounts with the same bulk polypropylene and 5 wt% of organically modified layered silicates. The resulting nanocomposites have been analyzed with x-ray diffraction, transmission electron microscopy and melt rheology. The extent of delamination in different nanocomposites has been quantified from analysis of several TEM images for each specimen by a product of the single particle volume fraction and the intrinsic viscosity of such particles. This measure correlated directly with the low shear relative viscosity of the molten composites (relative to the silicate free mixture of polypropylene and compatibilizer) and thus provides a quantitative index of the level of exfoliation of the clay. The results also indicate that the acid number alone is not a good predictor of compatibilizer effectiveness---i.e. the amount required for exfoliation. The most exfoliated nanocomposite was obtained with the compatibilizer that had the largest amount of covalently bound maleic anhydride, which is located predominantly at the ends of the PP-g-MA chain in an oligomeric graft. In addition, the wt. average molecular weight of the PP-g-MA is also significant for producing exfoliated structures by melt processing because sufficient stresses must be generated to slide the nanolayers apart.
590 $a School code: 0128.
650 4 $a Engineering, Chemical. $3 1018531
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