Polymer stabilized magnetite nanoparticles and poly(propylene oxide) modified styrene-dimethacrylate

Harris L.A.

Magnetic nanoparticles that display high saturation magnetization and high magnetic susceptibility are of great interest for medical applications. Nanomagnetite is particularly desirable because it displays strong ferrimagnetic behavior, and is less sensitive to oxidation than magnetic transition metals such as cobalt, iron, and nickel. For in-vivo applications, it is important that well-defined organic coatings surround the nanomagnetite particles. It is rationalized that this will prevent any aggregation of the nanoparticles in-vivo, and may also enable efficient excretion and protection of the body from toxicity.

---

Table of contents :
James E. McGrath……Page 1
Poly(propylene oxide) Modified Styrene-Dimethacrylate Networks……Page 4
List of Figures:……………………………………………….………………………………….ix……Page 8
List of Tables……Page 12
Introduction to polymer stabilized magnetite nanoparticles……Page 13
Dissertation overview……Page 17
The sixth chapter presents the research approach taken to increase the toughness of cured styrene-dimethacrylate resins. These materials were designed as structural adhesives for civil infrastructure applications. The complex viscosity of the resins wa……Page 18
Introduction to magnetism……Page 19
Theory of ferromagnetism and ferrimagnetism……Page 24
Magnetic properties of small particles……Page 29
Ferrofluids……Page 37
Magnetic nanoparticles classifications……Page 40
The iron oxides……Page 41
Magnetite……Page 43
Magnetite nanoparticle formation……Page 46
Iron oxide nanoparticles formed in constrained environments……Page 49
General aqueous coprecipitation of Fe2+ and Fe3+ salts……Page 52
Magnetite formation parameters of coprecipitation the method……Page 53
Magnetite nanoparticle stabilization……Page 56
Steric or entropic repulsion……Page 60
Steric stabilization methods and materials for iron oxide nanoparticles……Page 62
Bilayer surfactant……Page 66
Polymer surfactants……Page 67
Iron oxide nanoparticles incorporated into polymer particles synthesized in situ……Page 77
Effect of COOH on iron oxide nanoparticle formation and magnetic properties……Page 80
Characterization of magnetic nanoparticle systems……Page 84
Powder X-ray diffraction……Page 85
Magnetic nanoparticle applications……Page 89
Magnetite toxicity……Page 92
Introduction……Page 94
Materials……Page 97
Synthesis of polymer precursors and triblock polymer stabilizers……Page 98
A novel procedure for preparing a stabilized magnetite composition using a PEO-COOH-PEO triblock copolymer with 2000 g/mol Mn PEO endblocks and an average of three carboxylic acids in the central segment (2k-3-2k) was developed and is provided. This com……Page 100
Polymer precursors and triblock polymer stabilizer characterization……Page 101
Characterization of the polymer-stabilized magnetite……Page 102
Results and Discussion……Page 103
Conclusions……Page 120
Conclusions and suggested future work……Page 122
Generalized stabilizer methods: Carboxylic acid containing triblock polymers……Page 123
Acknowledgements……Page 125
List of Abbreviations I:……Page 126
5.1 Brief history of toughened thermosets……Page 133
Rubber modified vinyl ester resins……Page 136
Introduction……Page 140
Materials……Page 143
FTIR. The methacrylate functionalized of poly(propylene oxide) oliogomers and network cures were studied using a Nicolet Impact Model 400 Fourier transform infrared spectrometer (FTIR). The melt reaction was investigated on salt plates and the cure stu……Page 147
Results and discussion……Page 149
The fracture toughness produced by the incorporation of methacrylate terminated poly(propylene oxide) to the styrene/dimethacrylate network compositions was investigated using a 3-point bend method (Figure 6.10)…….Page 162
(6.4)……Page 163
Conclusions……Page 168
Acknowledgements……Page 169
Mn Number average molecular weight……Page 170
References II:……Page 171