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Reinforcement and degradation mechan...

Bogdanova, Irina Rifkatovna.

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Reinforcement and degradation mechanisms in polymer/inorganic nanocomposites.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Reinforcement and degradation mechanisms in polymer/inorganic nanocomposites./
Author:	Bogdanova, Irina Rifkatovna.
Description:	162 p.
Notes:	Adviser: Gordon L. Nelson.
Contained By:	Dissertation Abstracts International68-03B.
Subject:	Engineering, Materials Science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3254867

Reinforcement and degradation mechanisms in polymer/inorganic nanocomposites.
Bogdanova, Irina Rifkatovna.

Reinforcement and degradation mechanisms in polymer/inorganic nanocomposites. - 162 p.

Adviser: Gordon L. Nelson.

Thesis (Ph.D.)--Florida Institute of Technology, 2007.

This project accomplished the following goals: preparation of polymer/alumina nanocomposites using a single-screw extrusion approach, a systematic investigation of interfacial interactions, the mechanisms for reinforcement, and the thermal degradation and flame retardant mechanisms in polymer nanocomposites. In this work it was found that the stereochemistry of polymer macromolecules and the shapes of nanoparticles are extremely important in determining the interfacial interactions between them. Understanding of the nature of these interactions can result in a comprehensive understanding of reinforcement mechanisms in polymer nanocomposites. It was found that aromatic polymers such as polycarbonate and polystyrene have stronger interfacial interactions with needle or whisker-shaped nanoparticles than with spherical-shaped nanoparticles, while linear aliphatic polymers such as polymethylmethacrylate showed strong interactions with spherical nanoparticles. Other factors affecting the strength of interfacial interactions such as size, surface modification and concentration of nanoparticles were also studied. The thermal stability of polymer nanocomposites was studied to unravel the thermal degradation mechanisms. It was found that the chemical nature of nanoparticles plays a significant role in the thermal decomposition of polymer nanocomposites. For instance, SEM studies of polymer nanocomposites chars revealed that alumina nanoparticles moved to the surface of nanocomposites, while silica nanoparticles stayed in the body of the material, which enhances char formation. The mechanisms for the flammability in polymer/alumina nanocomposites were found to depend on the viscosity of the melt flow of nanocomposites.Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Reinforcement and degradation mechanisms in polymer/inorganic nanocomposites.
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035 $a (UMI)AAI3254867
035 $a AAI3254867
040 $a UMI $c UMI
100 1 $a Bogdanova, Irina Rifkatovna. $3 1279419
245 1 0 $a Reinforcement and degradation mechanisms in polymer/inorganic nanocomposites.
300 $a 162 p.
500 $a Adviser: Gordon L. Nelson.
500 $a Source: Dissertation Abstracts International, Volume: 68-03, Section: B, page: 1661.
502 $a Thesis (Ph.D.)--Florida Institute of Technology, 2007.
520 $a This project accomplished the following goals: preparation of polymer/alumina nanocomposites using a single-screw extrusion approach, a systematic investigation of interfacial interactions, the mechanisms for reinforcement, and the thermal degradation and flame retardant mechanisms in polymer nanocomposites. In this work it was found that the stereochemistry of polymer macromolecules and the shapes of nanoparticles are extremely important in determining the interfacial interactions between them. Understanding of the nature of these interactions can result in a comprehensive understanding of reinforcement mechanisms in polymer nanocomposites. It was found that aromatic polymers such as polycarbonate and polystyrene have stronger interfacial interactions with needle or whisker-shaped nanoparticles than with spherical-shaped nanoparticles, while linear aliphatic polymers such as polymethylmethacrylate showed strong interactions with spherical nanoparticles. Other factors affecting the strength of interfacial interactions such as size, surface modification and concentration of nanoparticles were also studied. The thermal stability of polymer nanocomposites was studied to unravel the thermal degradation mechanisms. It was found that the chemical nature of nanoparticles plays a significant role in the thermal decomposition of polymer nanocomposites. For instance, SEM studies of polymer nanocomposites chars revealed that alumina nanoparticles moved to the surface of nanocomposites, while silica nanoparticles stayed in the body of the material, which enhances char formation. The mechanisms for the flammability in polymer/alumina nanocomposites were found to depend on the viscosity of the melt flow of nanocomposites.
520 $a FT-IR, MS, and surface free energy characterization for modified alumina surfaces were done. The compatibility of polymer molecules and nanoparticles was studied on the basis of surface free energy. It was shown that modification of the alumina surface with silane coupling agents lowers the values of surface free energy for inorganic nanoparticles to the level of polymer surface free energy, and thus leads to a higher degree of the interfacial interactions between them.
590 $a School code: 0473.
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Chemistry, Polymer. $3 1018428
690 $a 0495
690 $a 0794
710 2 $a Florida Institute of Technology. $3 718970
773 0 $t Dissertation Abstracts International $g 68-03B.
790 $a 0473
790 1 0 $a Nelson, Gordon L., $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3254867