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Silica aerogel-polymer nanocomposite...

The University of Arizona., Materials Science & Engineering.

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Silica aerogel-polymer nanocomposites and new nanoparticle syntheses.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Silica aerogel-polymer nanocomposites and new nanoparticle syntheses./
作者:	Boday, Dylan Joseph.
面頁冊數:	326 p.
附註:	Adviser: Douglas A. Loy.
Contained By:	Dissertation Abstracts International70-04B.
標題:	Chemistry, Polymer. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3354935
ISBN:	9781109127614

Silica aerogel-polymer nanocomposites and new nanoparticle syntheses.
Boday, Dylan Joseph.

Silica aerogel-polymer nanocomposites and new nanoparticle syntheses. - 326 p.

Adviser: Douglas A. Loy.

Thesis (Ph.D.)--The University of Arizona, 2009.

Aerogels are extremely high surface area, low density materials with applications including thermal and acoustic insulators, radiation detectors and cometary dust particle traps. However, their low density and aggregate structure makes them extremely fragile and practically impossible to machine or handle without breaking. This has led to the development of aerogel composites with enhanced mechanical properties through the addition of polymers or surface modifiers. To date, attempts to strengthen aerogels have come with significant increases in density and processing time. Here I will describe our search for a solution to these problems with our invention using methyl cyanoacrylate chemical vapor deposition (CVD) to strengthen silica, aminated silica and bridged polysilsesquioxane aerogels. This approach led to a strength improvement of the composites within hours and the strongest composite prepared had a 100x strength improvement over the precursor aerogel. We also developed the first approach to control the molecular weight of the polymers that reinforce silica aerogels using surface-initiated atom transfer radical polymerization (SI-ATRP). Although PMMA reinforcement of silica aerogels improved the mechanical properties, further strength improvements were achieved by cross-linking the grafted PMMA. Additionally, we developed the first silica aerogels reinforced with polyaniline nanofibers that were strong and electrically conductive. Reinforcing silica aerogels with polyaniline allowed them to be used as a sensor for the detection of protonating and deprotonating gaseous species. Finally we developed a new approach for the synthesis of silica and bridged polysilsesquioxane spheres using a surfactant free synthesis. This approach allowed for the first in-situ incorporation of base sensitive functionalities during the sol-gel polymerization.

ISBN: 9781109127614Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Silica aerogel-polymer nanocomposites and new nanoparticle syntheses.
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300 $a 326 p.
500 $a Adviser: Douglas A. Loy.
500 $a Source: Dissertation Abstracts International, Volume: 70-04, Section: B, page: 2509.
502 $a Thesis (Ph.D.)--The University of Arizona, 2009.
520 $a Aerogels are extremely high surface area, low density materials with applications including thermal and acoustic insulators, radiation detectors and cometary dust particle traps. However, their low density and aggregate structure makes them extremely fragile and practically impossible to machine or handle without breaking. This has led to the development of aerogel composites with enhanced mechanical properties through the addition of polymers or surface modifiers. To date, attempts to strengthen aerogels have come with significant increases in density and processing time. Here I will describe our search for a solution to these problems with our invention using methyl cyanoacrylate chemical vapor deposition (CVD) to strengthen silica, aminated silica and bridged polysilsesquioxane aerogels. This approach led to a strength improvement of the composites within hours and the strongest composite prepared had a 100x strength improvement over the precursor aerogel. We also developed the first approach to control the molecular weight of the polymers that reinforce silica aerogels using surface-initiated atom transfer radical polymerization (SI-ATRP). Although PMMA reinforcement of silica aerogels improved the mechanical properties, further strength improvements were achieved by cross-linking the grafted PMMA. Additionally, we developed the first silica aerogels reinforced with polyaniline nanofibers that were strong and electrically conductive. Reinforcing silica aerogels with polyaniline allowed them to be used as a sensor for the detection of protonating and deprotonating gaseous species. Finally we developed a new approach for the synthesis of silica and bridged polysilsesquioxane spheres using a surfactant free synthesis. This approach allowed for the first in-situ incorporation of base sensitive functionalities during the sol-gel polymerization.
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650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Engineering, Materials Science. $3 1017759
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710 2 $a The University of Arizona. $b Materials Science & Engineering. $3 1064721
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790 1 0 $a Loy, Douglas A., $e advisor
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790 1 0 $a Seraphin, Supapan $e committee member
790 1 0 $a Uhlmann, Donald R. $e committee member
791 $a Ph.D.
792 $a 2009
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3354935