Amphiphilic Block Copolymers Of Polyethylene Oxide And Polyperfluorohexylethyl Methacrylate PDF Download
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Author | : Hazrat Hussain |
Publisher | : |
Total Pages | : 130 |
Release | : 2004 |
Genre | : |
ISBN | : |
Download Amphiphilic Block Copolymers of Poly(ethylene Oxide) and Poly(perfluorohexylethyl Methacrylate) Book in PDF, ePub and Kindle
Author | : Yi Wang (Polymer engineer) |
Publisher | : |
Total Pages | : 0 |
Release | : 2014 |
Genre | : Crystalline polymers |
ISBN | : |
Download The Synthesis and Characterization of Amphiphilic Poly(ethylene Oxide)-block-poly(octadecyl Acrylate) Block Copolymers Book in PDF, ePub and Kindle
A series of well-defined poly(ethylene oxide)-block-poly(octadecyl acrylate) (PEO-b-PODA) diblock copolymers were successfully synthesized by reversible addition fragmentation transfer (RAFT) polymerization with low polydispersities (M[subscript w]/M[subscript n] = 1.09-1.13). The crystallization behavior of poly(ethylene oxide)-block-poly(octadecyl acrylate) (PEO-b-PODA) diblock copolymers has been studied by differential scanning calorimetry (DSC), small-angle X-ray scattering (SAXS) and polarized optical microscopy (POM). The melt morphology of PEO455-PODA19 experienced a transition from lamella to cylinder at 130°C. For the double crystalline block copolymer PEO455-PODA19, the micro-phase separation at 55°C created lamellar micro-domains, which confined the PEO blocks as it crystallized. The leading crystallization of PEO blocks then created a space that confined PODA crystallites as they are developed. The spherulites were formed first when PEO started to crystallize, but crystallites with polyhedral shape finally formed. As for the micelle behavior, the transmission electron microscopy (TEM) showed that amphiphilic block copolymers PEO-PODA with different volume fractions of hydrophobic PODA blocks ranging from 21% to 54%, were able to self-assemble in water forming spherical micelles.
Author | : Volker Abetz |
Publisher | : Springer Science & Business Media |
Total Pages | : 272 |
Release | : 2005-12-02 |
Genre | : Technology & Engineering |
ISBN | : 9783540269021 |
Download Block Copolymers II Book in PDF, ePub and Kindle
. A.J. M ller, V. Balsamo, M.L. Arnal: Nucleation and Crystallization in Diblock and Triblock Copolymers.- 2 J.-F. Gohy: Block Copolymer Micelles.- 3 M.A. Hillmyer: Nanoporous Materials from Block Copolymer Precursors.- 4 M. Li, C. Coenjarts, C.K. Ober: Patternable Block Copolymers.-
Author | : Keith Redford |
Publisher | : |
Total Pages | : |
Release | : 1991 |
Genre | : |
ISBN | : |
Download Block Copolymers of Poly(ethylene Oxide) and Poly(methyl Methacrylate). Book in PDF, ePub and Kindle
Author | : Samuel Oppong Kyeremateng |
Publisher | : |
Total Pages | : 0 |
Release | : 2010 |
Genre | : |
ISBN | : |
Download Synthesis and Aggregation Behavior of Poly(propylene Oxide)-based Amphiphilic and Triphilic Block Copolymers Book in PDF, ePub and Kindle
Novel PPO-based amphiphilic diblock copolymers and triphilic multiblock copolymer analogues of the architectures BA, CBA, CAB, and CABAC have been successfully synthesized by combination of atom transfer radical polymerization (ATRP) and copper(I)-catalyzed alkyne-azide cycloaddition (CuAAC) 'click' reaction. The A, B, and C components of the block copolymers comprise of hydrophilic poly(glycerol monomethacrylate) (PGMA), lipophilic poly(propylene oxide) (PPO), and perfluorocarbon segment, respectively. Molar mass values of the polymers were obtained from 1H and 19F NMR spectroscopy measurements. Size exclusion chromatography (SEC) analysis confirmed low polydispersities (1.2 ≤ Mw/Mn ≤ 1.5) of the polymers. The aggregation of the triphilic block copolymers analogues, CBA, CAB, and CABAC, in aqueous solution showed intriguing structures. The structures they formed were governed by the strong immiscibility between the lipophilic PPO blocks and the fluorophilic perfluorocarbon segments as well as the blocks sequence and length. Compartmentalized structures were observed due the strong immiscibility between the PPO block and the perfluorocarbon segment.
Author | : 徐榮慶 |
Publisher | : |
Total Pages | : 88 |
Release | : 2007 |
Genre | : |
ISBN | : |
Download 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] Book in PDF, ePub and Kindle
Author | : Nirmal Balaji Kannan |
Publisher | : |
Total Pages | : |
Release | : 2016 |
Genre | : |
ISBN | : |
Download Poly(Pentafluorostyrene)-b-Poly(Methacrylic Acid) Amphiphilic Block Copolymers Via Nitroxide Mediated Polymerization Book in PDF, ePub and Kindle
Fluoropolymers are a versatile and attractive group of compounds having an interesting mix of properties that make them highly useful for various applications. Because of strong bonding between the carbon and fluorine atom, they exhibit unique physical and chemical properties such as high thermal stability, increased chemical resistance, low refractive index, enhanced inertness towards many solvents and hydro-compounds. These characteristics have led them to be widely used in aerospace, aeronautics, optics, microelectronics, paints and coatings, and engineering structures and as biomaterials. Amphiphilic copolymers possess unique solution and solid-state properties due to their well-defined molecular architecture. These properties arise as the result of covalently combining two thermodynamically different polymer blocks that phase separate on the nanoscale. Amphiphilic copolymers based on a fluoro-monomer will combine the favourable physiochemical properties of the desired fluorine segment in combination with complementary hydrophilic segments. Such fluorinated amphiphilic copolymers are potentially useful for drug delivery vehicles and membrane applications. This project is aimed at making fluorinated amphiphilic block copolymers of hydrophobic 2, 3, 4, 5, 6 -pentafluorostyrene (PFS) and hydrophilic methacrylic acid (MAA). A controlled radical polymerization mechanism, nitroxide mediated polymerization (NMP) using NHS-BlocBuilder as the initiator was employed. The advantage of using NMP is that it facilitates the synthesis of copolymers with well-controlled narrow molecular weight distribution. However, methacrylate homopolymerization by NMP is challenging due to the high dissociation equilibrium constant therefore, the use of PFS as a controlling comonomer was explored. We established that to obtain a controlled copolymerization, a minimum of 70 mol% PFS was required, which is significantly greater than other copolymerization systems such as using as little as 4.5-8 mol% styrene to control the copolymerization of MAA. We surmise that this lack of control is due to the unfavourable reactivity ratios (Appendix I) which favour the addition of MAA rather than PFS (rPFS = 0.012, rMAA = 8.12). However, these unique reactivity ratios suggest that a semi-batch approach can be utilized to synthesize almost pure block copolymers in one pot. Therefore, poly(PFS)-b-(PFS-ran-MAA) block copolymers were synthesized and characterized by a semi batch addition of MAA. While successful, the concentration of irreversibly terminated chains was evident and greater care in reducing these unwanted reactions needs to be addressed.
Author | : Björn Lindman |
Publisher | : Elsevier Science Limited |
Total Pages | : 435 |
Release | : 2000 |
Genre | : Science |
ISBN | : 9780444824417 |
Download Amphiphilic Block Copolymers Book in PDF, ePub and Kindle
It is the belief of the editors of this book that the recognition of block copolymers as being amphiphilic molecules and sharing common features with other well-studied amphiphiles will prove beneficial to both the surfactant and the polymer communities. An aim of this book is to bridge the two communities and cross-fertilise the different fields. To this end, leading researchers in the field of amphiphilic block copolymer self-assembly, some having a background in surfactant chemistry, and others with polymer physics roots, have agreed to join forces and contribute to this book. The book consists of four entities. The first part discusses theoretical considerations behind the block copolymer self-assembly in solution and in the melt. The second part provides case studies of self-assembly in different classes of block copolymers (e.g., polyethers, polyelectrolytes) and in different environments (e.g., in water, in non-aqueous solvents, or in the absence of solvents). The third part presents experimental tools, ranging from static (e.g., small angle neutron scattering) to dynamic (e.g., rheology), which can prove valuable in the characterization of block copolymer self-assemblies. The fourth part offers a sampling of current applications of block copolymers in, e.g., formulations, pharmaceutics, and separations, applications which are based on the unique self-assembly properties of block copolymers.
Author | : Jinendra Lakshmichand |
Publisher | : |
Total Pages | : 117 |
Release | : 2010 |
Genre | : |
ISBN | : |
Download Amphiphilic Block Copolymers in Aqueous-Polar Organic Solvent Mixtures Book in PDF, ePub and Kindle
Amphiphilic block copolymers of the poly(ethylene oxide)-poly(propylene oxide) (PEO-PPO) family are well known for self-assembling in the presence of water (selective solvent for PEO) into cubic, hexagonal and lamellar lyotropic liquid crystals. We are interested on how the aqueous phase behavior and structure of these polymeric amphiphiles can be modulated by the addition of polar organic solvents (e.g., glycerol, ethanol). Mixtures of water with two organic solvents (glycerol and ethanol) constitute a specific focus of this work. Our studies combine macroscopic observations (e.g., phase diagrams) with microscopic measurements (from small-angle X-ray scattering), and aim to relate the type of structure formed and its characteristic dimensions to the relative swelling of the polymer blocks and to the location of the solvent in the amphiphile assembly. Solvent-induced structural changes of block copolymers have interesting repercussions on the formulations and nonmaterial's synthesis in such media.
Author | : Matthias Schulz |
Publisher | : |
Total Pages | : 0 |
Release | : 2014 |
Genre | : |
ISBN | : |
Download Synthesis of Amphiphilic Block Copolymers and Their Interactions with Model Lipid Membranes Book in PDF, ePub and Kindle
Polymersome; hybrid lipid/polymer vesicle; nanoparticle; phase separation; antibody binding; diblock copolymer; triblock copolymer; polyisobutylene; poly(ethylene oxide)