Synthesis And Characterisation Of Organic Inorganic Hybrid Block Copolymers Of Polydimethylsiloxane And Polystyrene PDF Download
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Author | : Gareth Michael Bayley |
Publisher | : |
Total Pages | : 256 |
Release | : 2007 |
Genre | : Block copolymers |
ISBN | : |
Download Synthesis and Characterisation of Organic-inorganic Hybrid Block Copolymers of Polydimethylsiloxane and Polystyrene Book in PDF, ePub and Kindle
Author | : Maurice Wadley |
Publisher | : |
Total Pages | : 200 |
Release | : 2011 |
Genre | : Block copolymers |
ISBN | : |
Download Synthesis and Morphology Characterization of Polydimethylsiloxane-containing Block Copolymers Book in PDF, ePub and Kindle
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.
Author | : Rui Yin |
Publisher | : |
Total Pages | : 324 |
Release | : 1993 |
Genre | : |
ISBN | : |
Download Synthesis and Properties of the First Macrocyclic Polystyrene-polydimethylsiloxane Block Copolymers Book in PDF, ePub and Kindle
Author | : Anthony G. Karandinos |
Publisher | : |
Total Pages | : 546 |
Release | : 1997 |
Genre | : Block copolymers |
ISBN | : |
Download Synthesis of Organic-inorganic Hybrids Via Ozone Chemistry Book in PDF, ePub and Kindle
Author | : Judy S. Riffle |
Publisher | : |
Total Pages | : 436 |
Release | : 1980 |
Genre | : Block copolymers |
ISBN | : |
Download Synthesis and Characterization of Polycarbonate-polydimethylsiloxane Block Copolymers Book in PDF, ePub and Kindle
Author | : Aaron J. Moment |
Publisher | : |
Total Pages | : 260 |
Release | : 2000 |
Genre | : |
ISBN | : |
Download The Synthesis and Characterization of Polystyrene Liquid Crystalline Siloxane Block Copolymers Book in PDF, ePub and Kindle
Author | : Ashok Kakkar |
Publisher | : Royal Society of Chemistry |
Total Pages | : 241 |
Release | : 2017-04-13 |
Genre | : Technology & Engineering |
ISBN | : 1788010426 |
Download Miktoarm Star Polymers Book in PDF, ePub and Kindle
The term ‘miktoarm polymers’ refers to asymmetric branched macromolecules, a relatively new entry to the macromolecular field. Recent advances in their synthesis and intriguing supramolecular chemistry in a desired medium has seen a fast expansion of their applications. The composition of miktoarm polymers can be tailored and even pre-defined to allow a desired combination of functions, meaning polymer chemists can have complete control of the overall architecture of these macromolecules. By carefully selecting the composition, they can create supramolecular structures with intriguing properties, particularly for applications in biology. Miktoarm Star Polymers features chapters from experts actively working in this field, and provides the reader with a unique introduction to the fundamental principles of this exciting macromolecular system. Topics covered include the design, synthesis, characterization, self-assembly and applications of miktoarm polymers. The book is an excellent overview and up to date guide to those working in research in polymer chemistry, materials science, and polymers for medical applications.
Author | : L. Cazzaniga |
Publisher | : |
Total Pages | : 18 |
Release | : 1988 |
Genre | : |
ISBN | : |
Download Synthesis and Characterization of Isotactic Polystyrene-Polybutadiene Block Copolymers Book in PDF, ePub and Kindle
Diblock copolymers of isotactic polystyrene and 1,4 polybutadiene were successfully synthesized by two methods: a) coupling of two endfunctionalized homopolymers, and b) sequential synthesis of the two blocks. The polybutadiene blocks were prepared by anionic synthesis yielding = 90% 1,4 (cis-trans) and = 10% 1,2 addition. The preparation of the isotactic polystyrene block involved a novel anionic polymerization technique using low temperatures and the addition of BuOLi for stereospecific placement. Overall isotactic yields of 10% by weight were obtained, the remainder being unreacted monomer (50%) and atactic material (40%). The polymers were characterized by GPC, NMR and DSC to determine molecular weights, tacticity and percent crystallinity. The block-like nature of the copolymer was further analyzed through transmission electron microscopy. Keywords: Semicrystalline block copolymers; Polymer morphology. (JES).
Author | : Diane T. Babski |
Publisher | : |
Total Pages | : 142 |
Release | : 2002 |
Genre | : |
ISBN | : 9783898630863 |
Download Synthesis, Characterization, and Manipulation of Diblock Copolymers and Their Resulting Organic Inorganic Hybrid Materials at Surfaces and Interfaces Book in PDF, ePub and Kindle
Author | : James A. Lee |
Publisher | : |
Total Pages | : 156 |
Release | : 2000 |
Genre | : |
ISBN | : |
Download Synthesis and Characterization of Block Copolymers of Polyvinylpyridine (PVP) Or Polyalphamethylstyrene (PAMS) with Polydimethylsiloxane (PDMS), and Self Assembly of PVP-PDMS and Polyvinylphenol Book in PDF, ePub and Kindle