Journal ArticleDOI
Organic/Inorganic Nanocomposite Star Polymers via Atom Transfer Radical Polymerization of Methyl Methacrylate Using Octafunctional Silsesquioxane Cores
TLDR
In this paper, a method was developed for atom transfer radical polymerization (ATRP) synthesis of a nanocomposite consisting of dispersed, nanosized hard particles in a thermoplastic matrix.Abstract:
A method was developed for atom transfer radical polymerization (ATRP) synthesis of a nanocomposite consisting of dispersed, nanosized hard particles in a thermoplastic matrix. Octafunctional cubic silsesquioxanes were used as a platform to synthesize 8-arm star poly(methyl methacrylate) (PMMA) via ATRP. The cubic silsesquioxane, octakis(hydridodimethylsiloxy)octasilsesquioxane (Q8M8H), was converted to either octakis(2-bromo-2-methylpropionoxypropyldimethylsiloxy)octasilsesquioxane (OBPS) or the octaethylbenzyl chloride analogue. The bromo ester was successfully employed as an ATRP initiator using CuCl as catalyst, leading to formation of PMMA arms with controlled molecular weights and hence to nanocomposites with essentially complete control of dispersion and solids loading. The catalyst and initiator concentrations were demonstrated to affect the molecular weight distribution and the occurrence of star−star coupling caused by inevitable termination reactions.read more
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Transition metal-catalyzed living radical polymerization : toward perfection in catalysis and precision polymer synthesis
TL;DR: Catalytic Solvents: Catalyst Disproportionation 4981 2.2.1.
Journal ArticleDOI
POSS related polymer nanocomposites
Shiao-Wei Kuo,Feng-Chih Chang +1 more
TL;DR: In this paper, the synthesis of polyhedral oligomeric silsesquioxane (T8-POSS) compounds, the miscibility of POSS derivatives and polymers, the preparation of both multifunctional and monofunctional monomers, and the applications of several high-performance POSS nanocomposites in such systems as light emitting diodes, liquid crystals, photo-resist materials, low-dielectric constant materials, self-assembled block copolymers, and nanoparticles.
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Advanced functional materials based on polyhedral oligomeric silsesquioxane (POSS)
Kazuo Tanaka,Yoshiki Chujo +1 more
TL;DR: In this paper, a review of modified polyhedral oligomeric silsesquioxane (POSS) based functional materials is presented and the design concepts for applying the significant properties of POSS for the material properties.
Journal ArticleDOI
Nanobuilding blocks based on the [OSiO1.5]x (x= 6, 8, 10) octasilsesquioxanes
TL;DR: The dissolution of high surface area silica with tetralkylammonium hydroxides at concentrations greater than 0.2 M, produces polyanionic cage structures, [R4N+][−OSiO1.5]x.
Journal ArticleDOI
Copper-Mediated Living Radical Polymerization (Atom Transfer Radical Polymerization and Copper(0) Mediated Polymerization): From Fundamentals to Bioapplications
Cyrille Boyer,Nathaniel Corrigan,Kenward Jung,Diep Nguyen,Thuy-Khanh Nguyen,Nik Nik M. Adnan,Susan Oliver,Sivaprakash Shanmugam,Jonathan Yeow +8 more
TL;DR: Radical Polymerization and Copper(0) Mediated polymerization): From Fundamentals to Bioapplications
References
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Journal ArticleDOI
Controlled/"living" radical polymerization. atom transfer radical polymerization in the presence of transition-metal complexes
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Controlled Living Radical Polymerization - Halogen Atom-Transfer Radical Polymerization Promoted by a Cu(I)Cu(II) Redox Process
TL;DR: An extension of ATRA to atom transfer radical addition, ATRP, provided a new and efficient way to conduct controlled/living radical polymerization as mentioned in this paper, using a simple alkyl halide, R-X (X = Cl and Br), as an initiator and a transition metal species complexed by suitable ligand(s), M t n /L x, e.g., CuX/2,2'-bipyridine, as a catalyst.
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Hybrid nanocomposite materials―between inorganic glasses and organic polymers
TL;DR: The sol-gel process, with its associated mild conditions, offers a new approach to the synthesis of composite materials with domain sizes approaching the molecular level as mentioned in this paper, where transparent organic-inorganic composites can be prepared by dissolving preformed polymers into solgel precursor solutions and then allowing the tetraalkyi orthosilicates to hydrolyze and condense to form glassy SiO, phases of different morphological structures.
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Controlled/“Living” Radical Polymerization. Kinetics of the Homogeneous Atom Transfer Radical Polymerization of Styrene
TL;DR: The homogeneous atom transfer radical polymerization (ATRP) of styrene using solubilizing 4,4'dialkyl substituted 2,2'bipyridines yielded well-defined polymers with Mw/Mn ≤ 1.10 as mentioned in this paper.