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Synthesis And Morphology Characterization Of Polydimethylsiloxane Containing Block Copolymers
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Book Synopsis Synthesis and Morphology Characterization of Polydimethylsiloxane-containing Block Copolymers by : Maurice Wadley
Download or read book Synthesis and Morphology Characterization of Polydimethylsiloxane-containing Block Copolymers written by Maurice Wadley and published by . This book was released on 2011 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: The thin film morphology characteristics of polydimethylsiloxane-containing block copolymers have been investigated. For this investigation, a commercially available hydroxyl terminated PDMS was purchased from Gelest and attached to a carboxylic acid functional reversible addition-fragmentation chain transfer (RAFT) agent by Steglich esterification. This produced macro-RAFT agents to which styrene monomer was polymerized. By using this approach the generation of low polydispersity polystyrene-block-polydimethylsiloxane (PS-block-PDMS) copolymers of various molecular weights spanning a wide volume fraction range in which the PDMS block remained the same in each polymerization. Synthesized block copolymers were characterized by gel permeation chromatography (GPC) and nuclear magnetic resonance (NMR) spectroscopy. Bulk and thin film characterization of PS-block-PDMS copolymers was done by small-angle x-ray scattering (SAXS), transmission electron microscopy (TEM), contact angle measurements, scanning force microscopy (SFM), and grazing incidence small-angle X-ray scattering (GISAXS). The following observations have been made. For PS-rich PS-block-PDMS copolymer thin films the low surface tension of PDMS caused it to migrate to the film surface regardless of solvent choice. The surface morphology was found to depend strongly on the solubility parameter of the solvent and exhibited SFM images consistent with parallel cylinder, perforated lamellar, and lamellar surface layers with increasing solvent solubility parameter. This behavior was due to the selective swelling of the individual blocks under slightly selective, good solvent conditions. A custom solvent annealing apparatus provided similar results in which order-order transitions in the thin films were observed with increasing solvent solubility parameter. Additionally improvements in the long-range order were observed after 1 h of solvent annealing. PS-rich PS-block-PDMS copolymer thin films also displayed PDMS rich surfaces after casting. Etching of this wetting layer by exposure to ultraviolet/ozone (UVO) cleaner allowed characterization of the interior film morphology. GISAXS was also able to characterize domain orientation in the as-cast and selectively etched thin films. PDMS cylinder orientation in PS-block-PDMS copolymer was found to be dependent on solvent choice and polymer molecular weight. The likely mechanism for perpendicularly oriented PDMS cylinders in selective solvents was an order-order transition to spheres where cylinders would nucleate at the air/film surface and template a perpendicularly oriented morphology during evaporation induced ordering. Perpendicularly oriented PDMS cylinders were observed in the lower molecular weight PS-rich PS-block-PDMS thin film samples indicating a preferential molecular weight range for the formation of perpendicular domains. Solvent annealing in PS selective chlorobenzene improved the long range order, but was not a strong driving force in altering domain orientation.
Book Synopsis Block Copolymers in Nanoscience by : Massimo Lazzari
Download or read book Block Copolymers in Nanoscience written by Massimo Lazzari and published by John Wiley & Sons. This book was released on 2007-06-27 with total page 447 pages. Available in PDF, EPUB and Kindle. Book excerpt: This first book to take a detailed look at one of the key focal points where nanotechnology and polymers meet provides both an introductory view for beginners as well as in-depth knowledge for specialists in the various research areas involved. It investigates all types of application for block copolymers: as tools for fabricating other nanomaterials, as structural components in hybrid materials and nanocomposites, and as functional materials. The multidisciplinary approach covers all stages from chemical synthesis and characterization, presenting applications from physics and chemistry to biology and medicine, such as micro- and nanolithography, membranes, optical labeling, drug delivery, as well as sensory and analytical uses.
Book Synopsis Synthesis and Characterization of Polycarbonate-polydimethylsiloxane Block Copolymers by : Judy S. Riffle
Download or read book Synthesis and Characterization of Polycarbonate-polydimethylsiloxane Block Copolymers written by Judy S. Riffle and published by . This book was released on 1980 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structure Control of Functional Mesoporous Materials and Synthesis of Polydimethylsiloxane-containing Block Copolymer by : Siyang Wang
Download or read book Structure Control of Functional Mesoporous Materials and Synthesis of Polydimethylsiloxane-containing Block Copolymer written by Siyang Wang and published by . This book was released on 2016 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: Block copolymer templating is a versatile approach for the generation of well-defined porosity in a wide variety of framework chemistries. Here, we systematically investigate how the composition of a poly(methoxy poly[ethylene glycol] methacrylate)-block-poly(butyl acrylate) (PMPEG-PBA) template impacts the pore characteristics of mesoporous cobalt oxide films. Three templates with a constant PMPEG segment length and three different hydrophilic block volume fractions of 17%, 51% and, 68% for the PMPEG-PBA are cooperatively assembled with cobalt nitrate hexahydrate and citric acid. Irrespective of template composition, a spherical nanostructure is templated and elliptical mesostructures are obtained on calcination due to uniaxial contraction of the film. The average pore size increases from 11.4 ± 2.8 nm to 48.5 ± 4.3 nm as the length of the PBA segment increases as determined from AFM. For all three templates examined, a maximum in porosity (~35 % in all cases) and surface area is obtained when the precursor solids contain 35-45 wt % PMPEG-PBA. This invariance suggests that the total polymer content drives the structure through interfacial assembly. The composition for maximizing porosity and surface area with the micelle templating approach results from a general decrease in porosity with increasing cobalt nitrate hexahydrate content and the increasing mechanical integrity of the framework to resist collapse during template removal / crystallization as the cobalt nitrate hexahydrate content increases. Unlike typical evaporation induced self-assembly with sol gel chemistry, the hydrophilic/hydrophobic composition of the block copolymer template is not a critical component to the mesostructure developed with micelle-templating using metal nitrate-citric acid as the precursor.A series of PS-PDMS with narrow molecular weight distributions with aimed molecular weight was synthesized with PDMS-RAFT as a macro-chain transfer agent via reversible addition fragmentation chain transfer (RAFT) polymerization. The PDMS-RAFT agent is utilized to control the free radical polymerization of styrene monomer. Hydroxyl terminated polydimethylsiloxane (PDMS-OH) is end functionalized through esterification with a carboxylic acid functional RAFT agent. The thin films of the synthesized PS-PDMS block copolymers are fabricated with spin coating and subsequently annealed with solvent vapor annealing with soft shear (SVA-SS). Varied surface morphology can be obtained with different volume fraction of polystyrene block in PS-PDMS, however, long range ordered structures have not been obtained as expected. Moreover, tri-block copolymer polydimethylsiloxane-block-poly ethyl acrylate-block-poly styrene (PDMS-PS-PEA) with low polydispersity has been successful synthesized with low polydispersity (PDI) in order to investigate more interesting morphologies.
Book Synopsis Synthesis and Characterization of Block Copolymers of Polyvinylpyridine (PVP) Or Polyalphamethylstyrene (PAMS) with Polydimethylsiloxane (PDMS), and Self Assembly of PVP-PDMS and Polyvinylphenol by : James A. Lee
Download or read book Synthesis and Characterization of Block Copolymers of Polyvinylpyridine (PVP) Or Polyalphamethylstyrene (PAMS) with Polydimethylsiloxane (PDMS), and Self Assembly of PVP-PDMS and Polyvinylphenol written by James A. Lee and published by . This book was released on 2000 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Characterization of PDMS-based Block Copolymers Toward Sub-10nm Nanopatterning by : Yingdong Luo
Download or read book Synthesis and Characterization of PDMS-based Block Copolymers Toward Sub-10nm Nanopatterning written by Yingdong Luo and published by . This book was released on 2015 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt: Block copolymer self-assembly has been used as nanopatterning towards applications of lithography for decades. For the purpose of smaller, faster and cheaper transistor developments, block copolymers with high Flory-Huggins parameter and better etching contrast need to be further developed. PDMS based block copolymers are of the most interest among all candidates. I synthesized a library of well defined PDMS-b-PMMA, PDMS-b-PS and PDMS-b-PEO through "click" chemistry. The Flory-Huggins interaction parameters of these block copolymers are characterized much higher than conventional block copolymers as expected. Therefore, sub-10 nm domain periods are achieved by these materials in bulk. Significantly, long range ordered nanoline and nanodot patterns have been produced by PDMS-b-PMMA. Furthermore, a small molecule (L)-tartaric acid used as a hydrogen bonding donor was proved to efficiently suppress the crystallinity of PEO and significantly enhance the self-assembly behavior. Finally, the triazole moiety in the middle of the block copolymer which synthesized by "click" chemistry was functionalized to produce an ionic junction block copolymer. The electrostatic interactions before the opposite charges act as an extra enthalpy to help the self-assembly. Therefore, order disorder transition temperature of the block copolymer was dramatically increased.
Book Synopsis The Polysiloxanes by : James E. Mark
Download or read book The Polysiloxanes written by James E. Mark and published by . This book was released on 2015 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: A synthesis of the novel aspects of polysiloxane science and engineering.
Book Synopsis The Synthesis and Characterization of Monodisperse Polydimethylsiloxane-poly (methyl Methacrylate) AB, ABA and Star Block Copolymers by : James Peter Mason
Download or read book The Synthesis and Characterization of Monodisperse Polydimethylsiloxane-poly (methyl Methacrylate) AB, ABA and Star Block Copolymers written by James Peter Mason and published by . This book was released on 1989 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Silicon-containing Block Copolymers with Well-defined, Branched Architectures by : Alejandra Teresa García Marcos
Download or read book Silicon-containing Block Copolymers with Well-defined, Branched Architectures written by Alejandra Teresa García Marcos and published by . This book was released on 2006 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis, Characterization and Self-assembly of Amphiphilic Block Copolymers by : Xiaojun Wang
Download or read book Synthesis, Characterization and Self-assembly of Amphiphilic Block Copolymers written by Xiaojun Wang and published by . This book was released on 2012 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents a review on state-of-the-art research of well-defined charged block copolymers, including synthesis, characterization, bulk morphology and self-assembly in aqueous solution of amphiphilic block polyelectrolytes. In Chapter 1, as a general introduction, experimental observations and theoretical calculations devoted towards understanding morphological behavior in charged block copolymer systems are reviewed along with some of the new emerging research directions. Further investigation of charged systems is urged in order to fully understand their morphological behavior and to directly target structures for the tremendous potential in technological applications. Following this background, in Chapters 2, 3, 4 and 5 are presented the design and synthesis of a series of well-defined block copolymers composed of charged and neutral block copolymers with full characterization: sulfonated polystyrene-b-fluorinated polyisoprene (sPS-b-fPI) and polystyrene-b-sulfonated poly(1,3-cyclohexadiene) (PS-b-sPCHD). Their bulk morphological behaviors in melts and self-assembly of sPS-b-fPI, PS-b-sPCHD in water were investigated. Some unique behaviors of sPS-b-fPI were discovered. The mechanisms for formation of novel nanostructures in aqueous solution are discussed in details in Chapter 4. Spherical and vesicular structures were formed from strong electrolyte block copolymers, e.g. PS-bsPCHD. Detailed light scattering and transmission electron microscopy were applied to characterize these structures. The abnormal formation of vesicles as well as microstructure effects on self-assembly is discussed in Chapter 5. In Chapter 6, we describe the successful synthesis of a well-defined acid-based block copolymers containing polyisoprene while maintaining the integrity of the functionality (double bonds) of polyisoprene. A general purification method is also presented in order to remove homo polyisoprene, polystyrene, and PS-b-PI in the di-, and tri-block copolymers. The self-assembly of PS-b-PI-b-PAA triblock terpolymers was studied in order to form multicompartmental structures in aqueous environments. In the last Chapter 7, detailed synthesis and characterization of a novel conjugate: poly(L-leucine) grafted hyaluronan (HA) (HA-g-PLeu) are presented. This work describes a new method to synthesize HA-g-PLeu via a "grafting onto" strategy. Due to the amphiphilic nature of this graft copolymers, a "local network" formed by self-assembly which was characterized by atomic force microscopy and light scattering. The secondary structure of the polypeptide was revealed by circular dichroism.
Book Synopsis Synthesis and Characterization of Ionically Bonded Diblock Copolymers by : Lei Feng (Chemical engineer)
Download or read book Synthesis and Characterization of Ionically Bonded Diblock Copolymers written by Lei Feng (Chemical engineer) and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Block copolymers consist of two or more incompatible polymer chains linked by covalent bonds. These block copolymer can separate into nanometer sized domains whose morphology depends upon the size of the block and interactions between them. The properties of block copolymers can be modified and potentially improved by introducing noncovalent interactions to replace covalent linkages between blocks to form supramolecular block copolymers. These kinds of materials combine the microphase separation inherent to block copolymers with the facile synthesis of supramolecular materials thereby affording new and unique materials. This dissertation focuses on synthesis and characterization of PS-b-PMA block copolymers with ion-pair junctions.Firstly, the chain-end sulfonated polystyrene ([omega]-sulfonated PS) was synthesized by reversible addition fragmentation chain transfer (RAFT) polymerization and postpolymerization modification. In the postpolymerization modification two methods were investigated: in the first one, the polymer was converted to a thiol-terminated polymer by aminolysis. Then a sulfonic acid end-group was produced then by oxidation of the thiol end-group with m-chloroperoxybenzoicacid (m-CPBA); in the second method, the RAFT-polymerized polymer was directly sulfonated by oxidation with m-CPBA. After purification by column chromatography, [omega]-sulfonated PS was obtained by both methods with greater than 95% end-group functionality as measured by titration. The sulfonic acid end-group could be neutralized with various ammonium or imidazolium counter ions through acid-base or ionic metathesis reactions. These polymers with ionic end-group can be used as model supramolecular building blocks.Secondly, ammonium end functionalized polymethylacrylate (PMA) was synthesized directly by RAFT polymerization using functional RAFT agent. Then chain-end sulfonated polystyrene and ammonium end functionalized polymethylacrylate (PMA) were used to synthesize A-B block copolymers by two different methods: the first method was by mixing two oppositely charged end group functionalized polymers; the second method was to ionically bond a RAFT agent to the chain end of an end sulfonated polymer to generate a supramolecular macro RAFT agent then an A-B block copolymer was prepared by RAFT polymerization using supramolecular macro-RAFT agent. The polymerization kinetics were investigated and the molecular weight and the chemical structure of the block copolymers were characterized by 1H-NMR and SEC. The results show that the ion-bonded supramolecular block copolymer, PS-PMA, have been successfully prepared with controlled molecular weight and narrow distribution.Thirdly, the morphology of the ion-bonded supramolecular PS-PMA diblock copolymers were investigated by small-angle X-ray scattering (SAXS) and rheological techniques. Several covalently bonded PS-PMA block copolymers were synthesized by RAFT polymerization and their micro domain structures and rheology behaviors were also investigated. The results showed that the electrostatic interactions between the end ion groups are able to overcome the thermodynamic repulsion of two blocks result in the formation of diblock copolymers with similar behaviors and morphology of traditional covalent bonded diblock copolymers and their micro domain structures remain to high temperatures.
Book Synopsis Synthesis and Morphology Characterization of Different Architecture of Amphiphilic Block Copolymers, Polystyrene-block-poly[3-(trimethoxysilyl)propyl Methacrylate] and Polystyrene-block-poly [2-(dimethylamino)ethyl Methacrylate] by : 徐榮慶
Download or read book Synthesis and Morphology Characterization of Different Architecture of Amphiphilic Block Copolymers, Polystyrene-block-poly[3-(trimethoxysilyl)propyl Methacrylate] and Polystyrene-block-poly [2-(dimethylamino)ethyl Methacrylate] written by 徐榮慶 and published by . This book was released on 2007 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Molecular Design, Synthesis, Characterization, and Processing of Liquid Crystalline Diblock Copolymers by : Guoping Mao
Download or read book Molecular Design, Synthesis, Characterization, and Processing of Liquid Crystalline Diblock Copolymers written by Guoping Mao and published by . This book was released on 1997 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Properties of the First Macrocyclic Polystyrene-polydimethylsiloxane Block Copolymers by : Rui Yin
Download or read book Synthesis and Properties of the First Macrocyclic Polystyrene-polydimethylsiloxane Block Copolymers written by Rui Yin and published by . This book was released on 1993 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis, Characterization and Morphological Studies of Poly(m-phenylene Isophthalamide), Its Block Copolymers and Some Mixtures by : Shek Chee Horne
Download or read book Synthesis, Characterization and Morphological Studies of Poly(m-phenylene Isophthalamide), Its Block Copolymers and Some Mixtures written by Shek Chee Horne and published by . This book was released on 1977 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis, Characterization and Morphology of Block Copolymers Poly(3-hexylthiophene)-b-poly(3-thiophene Hexylacetate) by : 劉祐誠
Download or read book Synthesis, Characterization and Morphology of Block Copolymers Poly(3-hexylthiophene)-b-poly(3-thiophene Hexylacetate) written by 劉祐誠 and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Characterization of Polydimethylsiloxane-urea Segmented Copolymers by : Ahmad Khairuddin Sha'aban
Download or read book Synthesis and Characterization of Polydimethylsiloxane-urea Segmented Copolymers written by Ahmad Khairuddin Sha'aban and published by . This book was released on 1983 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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