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Synthesis of functionalized poly(dim...

O'Brien, Kristen Wilson.

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Synthesis of functionalized poly(dimethylsiloxane)s and the preparation of magnetite nanoparticle complexes and dispersions.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Synthesis of functionalized poly(dimethylsiloxane)s and the preparation of magnetite nanoparticle complexes and dispersions./
Author:	O'Brien, Kristen Wilson.
Description:	162 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-08, Section: B, page: 3845.
Contained By:	Dissertation Abstracts International64-08B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3102599

Synthesis of functionalized poly(dimethylsiloxane)s and the preparation of magnetite nanoparticle complexes and dispersions.
O'Brien, Kristen Wilson.

Synthesis of functionalized poly(dimethylsiloxane)s and the preparation of magnetite nanoparticle complexes and dispersions. - 162 p.

Source: Dissertation Abstracts International, Volume: 64-08, Section: B, page: 3845.

Thesis (Ph.D.)--Virginia Polytechnic Institute and State University, 2003.

Poly(dimethylsiloxane) (PDMS) fluids containing magnetite nanoparticles stabilized with carboxylic acid-functionalized PDMS were prepared. PDMS-magnetite complexes were characterized using transmission electron microscopy, elemental analysis, and vibrating sample magnetometry. PDMS-magnetite complexes containing up to 67 wt% magnetite with magnetizations of &sim;52 emu gram-1 were prepared. The magnetite particles were 7.4 +/- 1.7 nm in diameter. Calculations suggested that the complexes prepared using mercaptosuccinic acid-functionalized PDMS (PDMS-6COOH) complexes contained unbound acid groups whereas the mercaptoacetic acid-functionalized PDMS (PDMS-3COOH) complexes did not. Calculations showed that the PDMS-3COOH and PDMS-6COOH covered the same surface area on magnetite. Calculations were supported by molecular models and FTIR analyses. The complexes were dispersed into PDMS carrier fluids by ultrasonication, resulting in magnetic PDMS fluids with potential biomedical applications.Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Synthesis of functionalized poly(dimethylsiloxane)s and the preparation of magnetite nanoparticle complexes and dispersions.
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035 $a (UnM)AAI3102599
035 $a AAI3102599
040 $a UnM $c UnM
100 1 $a O'Brien, Kristen Wilson. $3 1952140
245 1 0 $a Synthesis of functionalized poly(dimethylsiloxane)s and the preparation of magnetite nanoparticle complexes and dispersions.
300 $a 162 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-08, Section: B, page: 3845.
500 $a Chair: Judy S. Riffle.
502 $a Thesis (Ph.D.)--Virginia Polytechnic Institute and State University, 2003.
520 $a Poly(dimethylsiloxane) (PDMS) fluids containing magnetite nanoparticles stabilized with carboxylic acid-functionalized PDMS were prepared. PDMS-magnetite complexes were characterized using transmission electron microscopy, elemental analysis, and vibrating sample magnetometry. PDMS-magnetite complexes containing up to 67 wt% magnetite with magnetizations of &sim;52 emu gram-1 were prepared. The magnetite particles were 7.4 +/- 1.7 nm in diameter. Calculations suggested that the complexes prepared using mercaptosuccinic acid-functionalized PDMS (PDMS-6COOH) complexes contained unbound acid groups whereas the mercaptoacetic acid-functionalized PDMS (PDMS-3COOH) complexes did not. Calculations showed that the PDMS-3COOH and PDMS-6COOH covered the same surface area on magnetite. Calculations were supported by molecular models and FTIR analyses. The complexes were dispersed into PDMS carrier fluids by ultrasonication, resulting in magnetic PDMS fluids with potential biomedical applications.
520 $a Magnetite particles (100 nm to 1 mum in diameter) were prepared by crystallization from goethite/glycol/water solutions under pressure. Two methods for particle growth were investigated in which the crystallization medium was varied by adjusting the amount of water or by adding itaconic acid. Particle surfaces were analyzed by x-ray photoelectron spectroscopy (XPS). Particles with clean surfaces were coated with carboxylic acid-functionalized poly(epsilon-caprolactone) stabilizers. Adding itaconic acid to the reactions afforded particles &sim;100 nm in diameter. The magnetite particles displayed magnetic hysteresis. The particles were dispersed into vinyl ester resins by ultrasonication and it was demonstrated that the &sim;100 nm particles remained dispersed for three days without agitation. These dispersions have applications in magnetic induction heating for composite repair.
520 $a Living polymerizations of hexamethylcyclotrisiloxane were terminated with dimethylchlorosilane, phenylmethylchlorosilane, or diisopropylchlorosilane (DIPCS). Platinum-catalyzed hydrosilation of the hydrosilane-terminated PDMS with allyloxyethanol afforded a systematic series of hydroxyalkyl-terminated PDMS. The reactions were successful except for the hydrosilation of the sterically-hindered DIPCS-functionalized PDMS where no reaction was observed. Hydroxyalkyl-terminated PDMS oligomers were successful in initiating the stannous octoate-catalyzed copolymerization of epsilon-caprolactone, which afforded PDMS-b-PCL diblock copolymers of controlled composition.
590 $a School code: 0247.
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Chemistry, Organic. $3 516206
690 $a 0495
690 $a 0490
710 2 0 $a Virginia Polytechnic Institute and State University. $3 1017496
773 0 $t Dissertation Abstracts International $g 64-08B.
790 1 0 $a Riffle, Judy S., $e advisor
790 $a 0247
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3102599