Gelation And Micellization Of Polyethylene Oxide And Polypropylene Oxide Triblock Copolymers In Aqueous Solutions PDF Download
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Author | : Erling Bonne Jørgensen |
Publisher | : |
Total Pages | : |
Release | : 1996 |
Genre | : |
ISBN | : |
Download Gelation and Micellization of Poly(ethylene Oxide) and Poly(propylene Oxide) Triblock Copolymers in Aqueous Solutions Book in PDF, ePub and Kindle
Author | : Elkin Mauricio Amado Zúñiga |
Publisher | : |
Total Pages | : 136 |
Release | : 2010 |
Genre | : |
ISBN | : |
Download Triblock Copolymers of Poly(2,3-dihydroxypropyl Methacrylate) and Poly(propylene Oxide) Book in PDF, ePub and Kindle
Novel water soluble amphiphilic PGMA-b-PPO-b-PGMA triblock copolymers were successfully synthesized via ATRP technique. The blocks comprised a thermoresponsive poly(propylene oxide) (PPO) middle block with a molar mass of around 2000 g·mol-1 and two hydroxy-functional poly(2,3-dihydroxypropyl methacrylate) (PGMA) outer blocks of varying length. Their micellization in aqueous solutions was studied, as well as their adsorption behavior at the air-water interface. Besides, their adsorption kinetics and concomitant interactions with phospholipid model membranes were investigated in order to gain a better insight into the PGMA-b-PPO-b-PGMA-membrane interactions on a molecular level.
Author | : Zhuo Yang |
Publisher | : |
Total Pages | : 122 |
Release | : 1993 |
Genre | : |
ISBN | : |
Download Effect of Block Structure on the Micellisation and Gelation of Aqueous Solutions of Copolymers of Ethylene Oxide and Butylene Oxide Book in PDF, ePub and Kindle
Author | : Frederick Eugene Bailey |
Publisher | : |
Total Pages | : 192 |
Release | : 1976 |
Genre | : Science |
ISBN | : |
Download Poly(ethylene Oxide) Book in PDF, ePub and Kindle
Author | : Thomas G. O'Lenick |
Publisher | : |
Total Pages | : 233 |
Release | : 2011 |
Genre | : |
ISBN | : |
Download Thermo- and PH-sensitive Hydrophilic Block Copolymers Book in PDF, ePub and Kindle
This dissertation presents the synthesis of a series of thermo- and pH-sensitive hydrophilic block copolymers and the study of their solution behavior in water. By incorporating a small amount of weak acid or base groups into the thermosensitive block(s) of a hydrophilic block copolymer, the LCST of the thermosensitive block(s) can be modified by changing the solution pH. Accordingly, the critical micellization temperature (CMT) and the sol-gel transition temperature (T[subscript sol-gel]) of the block copolymer in water can be tuned. Chapter 1 describes the synthesis of thermo- and pH-sensitive poly(methoxydi(ethylene glycol) methacrylate-co-methacrylic acid)-b-PEO-b-poly(methoxydi(ethylene glycol) methacrylate-co-methacrylic acid) and the study of sol-gel transitions of its aqueous solutions at various pH values. The CMT of the 0.2 wt% solution and the T[subscript sol-gel] of the 12.0 wt% solution of this copolymer can be varied over a large temperature range. By judiciously controlling temperature and pH, multiple sol-gel-sol transitions were realized. Chapter 2 presents a systematic study of pH effect on rheological properties of micellar gels formed from 10.0 wt% aqueous solutions of thermo- and pH-sensitive poly(ethoxydi(ethylene glycol) acrylate-co-acrylic acid)-b-PEO-b-poly(ethoxydi(ethylene glycol) acrylate-co-acrylic acid). With the increase of pH, the sol-gel transition became broader. The plateau moduli (G[subscript N]) evaluated from frequency sweeps at T/T[subscript sol-gel] of 1.025, 1.032, and 1.039 decreased with the increase of pH from 3.00 to 5.40 with the largest drop observed at pH = ~ 4.7. The decrease in G[subscript N] reflects the reduction of the number of bridging chains. The ionization of carboxylic acid introduced charges onto the thermosensitive blocks and made the polymer more hydrophilic, facilitating the formation of loops and dangling chains. Chapter 3 presents the synthesis of PEO-b-poly(methoxydi(ethylene glycol) methacrylate-co-2-(N-methyl-N-(4-pyridyl)amino)ethyl methacrylate) with the thermosensitive block containing a catalytic 4-N, N-dialkylaminopyridine and the study of the effect of thermo-induced micellization on its activity in the hydrolysis of p-nitrophenyl acetate. The CMTs of this copolymer at pH of 7.06 and 7.56 were 40 and 37 °C, respectively. Below CMT, the logarithm of initial hydrolysis rate changed linearly with 1/T. Above CMT, the reaction rate leveled off, which is presumably because it was controlled by mass transport to the core of micelles above CMT.
Author | : Josélio Viera |
Publisher | : |
Total Pages | : 548 |
Release | : 2002 |
Genre | : Adsorption |
ISBN | : |
Download Properties of Aqueous Solutions of Triblock Copolymers of Ethylene Oxide and Propylene Oxide and Their Mixtures with Surfactants Studied by Surface Tension and Neutron Reflection Book in PDF, ePub and Kindle
Author | : F. Mallamace |
Publisher | : IOS Press |
Total Pages | : 802 |
Release | : 1997 |
Genre | : Science |
ISBN | : 1614992193 |
Download The Physics of Complex Systems Book in PDF, ePub and Kindle
This volume focuses on the area of the physics of complex systems and provides both an overview of the field and more detailed examination of those topics within the field that are currently of greatest interest to researchers. The properties of complex systems play an important role in a variety of different and overlapping areas in physics, chemistry, biology, mathematics and technology. The research field of complex systems is very broad, but this volume attempts to be comprehensive. This book is a useful reference work for researchers in this area, whether graduate students or advanced academics. Up-to-date reviews of cutting-edge topics are provided, compiled by leading authorities and designed to both broaden the reader's insight and encourage the exploration of new problems in related fields. An overview of the present status of the physics of complex systems is provided on the following general topics: (1) scaling behaviours; (2) supramolecular systems; (3) aggregation, aggregation kinetics and disorderly growth mechanisms; (4) granularly matter; (5) polymers, associating polymers, polyelectrolytes and gels; (6) amphiphiles, emulsions, colloids, membranes and interface phenomena; (7) molecular motors; (8) phase separation and out of equilibrium dynamics; (9) turbulence, chaos and chaotic dynamics; (10) glass transition, supercooled fluids and (11) geometrically constrained dynamics.
Author | : G A Webb |
Publisher | : Royal Society of Chemistry |
Total Pages | : 628 |
Release | : 2007-10-31 |
Genre | : Science |
ISBN | : 1847553826 |
Download Nuclear Magnetic Resonance Book in PDF, ePub and Kindle
As a spectroscopic method, Nuclear Magnetic Resonance (NMR) has seen spectacular growth over the past two decades, both as a technique and in its applications. Today the applications of NMR span a wide range of scientific disciplines, from physics to biology to medicine. Each volume of Nuclear Magnetic Resonance comprises a combination of annual and biennial reports which together provide comprehensive of the literature on this topic. This Specialist Periodical Report reflects the growing volume of published work involving NMR techniques and applications, in particular NMR of natural macromolecules which is covered in two reports: "NMR of Proteins and Acids" and "NMR of Carbohydrates, Lipids and Membranes". For those wanting to become rapidly acquainted with specific areas of NMR, this title provides unrivalled scope of coverage. Seasoned practitioners of NMR will find this an in valuable source of current methods and applications. Specialist Periodical Reports provide systematic and detailed review coverage in major areas of chemical research. Compiled by teams of leading authorities in the relevant subject areas, the series creates a unique service for the active research chemist, with regular, in-depth accounts of progress in particular fields of chemistry. Subject coverage within different volumes of a given title is similar and publication is on an annual or biennial basis.
Author | : Ece Aytan |
Publisher | : |
Total Pages | : 176 |
Release | : 2014 |
Genre | : Polymers |
ISBN | : |
Download PEO-PPO-PEO Triblock Copolymers in Aqueous Solutions: Micellization and Self-assembly Into Fiberlike Aggregates 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.