Synthesis of Layered-Silica/Polymer Nanocomposites
Item
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Title
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Synthesis of Layered-Silica/Polymer Nanocomposites
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Identifier
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d_2009_2013:62253d9b7059:11945
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identifier
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12589
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Creator
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Tian, Xue,
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Contributor
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Nan-Loh Yang
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Date
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2013
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Language
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English
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Publisher
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City University of New York.
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Subject
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Polymer chemistry | Analytical chemistry | ARGET ATRP | atom transfer radical polymerization | layered silica | nanocomposite | surface initiation
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Abstract
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This dissertation includes four chapters. Chapter I is the introduction of nanocomposite materials, the traditional synthesis methods are discussed and the properties of the nanocomposites are reviewed.;Chapter II provides a general introduction of mesoporous silicas, and introduces the synthesis of two lamellar phase silicas template by different surfactant mixtures based on published literature procesures. The preparation was successful, as confirmed by small-angle X-ray scattering (SAXS).;Chapter III describes the synthesis of nanocomposites by surface-initiated atom transfer radical polymerization (ATRP) and Chapter IV introduces the synthesis of nanocomposites by activators regenerated by electron transfer atom transfer radical polymerization (ARGET ATRP). The mechanism and components of the reaction mixtures in the living ATRP are discussed. It is shown that 3-(chlorodimethylsilyl)propyl 2-bromo-2-methylpropanoate is a suitable initiator grafted on the surface of the layered silicas. It is described that polymerization of methyl methacrylate (MMA), styrene (St) and acrylonitrile (AN) was carried out by using ATRP or ARGET ATRP. The polymer loadings were accessed by thermogravimetric analysis (TGA), morphologies of the nanocomposites were examined by SAXS and transmission electron microscopy (TEM), and their thermal properties were accessed by using differential scanning calorimetry (DSC). Generally, normal ATRP was found to allow for better retention of lamellar (intercalated) morphology. However, ARGET ATRP also worked well and allowed us to lower the copper catalyst content to several ppm, that is, by about two orders of magnatitude.
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Type
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dissertation
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Source
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2009_2013.csv
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degree
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Ph.D.
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Program
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Chemistry
