Surface And Bulk Phase Separations In Block Copolymers And Their Blends PDF Download
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Author | : Niranjan M. Patel |
Publisher | : |
Total Pages | : 248 |
Release | : 1984 |
Genre | : Block copolymers |
ISBN | : |
Download Surface and Bulk Phase Separations in Block Copolymers and Their Blends Book in PDF, ePub and Kindle
Surface and bulk properties have been studied in terms of composition and morphology of siloxane containing block copolymers and their blends with homopolymers. X-ray Photoelectron Spectroscopy (XPS) has been used to obtain the compositional information from the top 60 angstroms or so at the surface. Transmission Electron Microscopy (TEM) was utilized to probe the bulk morphology. An attempt is made to compare the bulk and the surface and find possible mechanisms governing them. It is found that solvent-cast neat block copolymers have a uniform layer at the surface that is rich in siloxane whereas their bulk has a microphase-separated domain structure. In case of blends, siloxane enrichment is quite pronounced even at bulk concentrations as low as 0.05% w/w siloxane. Amount of surface siloxane as a function of bulk content is studied with the help of XPS. At the same time, the bulk morphology of these blends is studied by TEM. The changes occuring in the surface and the bulk are found to have similar patterns.
Author | : Dong Won Park |
Publisher | : |
Total Pages | : 254 |
Release | : 1991 |
Genre | : |
ISBN | : |
Download Block Copolymers as Compatibilizer of Polymer Blends and Its Effect on Phase Separation Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 1278 |
Release | : 1984 |
Genre | : Aeronautics |
ISBN | : |
Download Scientific and Technical Aerospace Reports Book in PDF, ePub and Kindle
Author | : R. J. Roe |
Publisher | : |
Total Pages | : 32 |
Release | : 1984 |
Genre | : |
ISBN | : |
Download Phase Diagram of Polymer Blends Containing Block Copolymers Book in PDF, ePub and Kindle
The phase transition and phase separation behavior occurring in mixtures containing an A-B block copolymer and an A homopolymer is discussed. With a pure block copolymer an order-disorder transition can be induced by raising the temperature, whereby the ordered lattice of segregated microdomains becomes unstable and give way to a homogeneous liquid structure. Small amounts of a homopolymer added to a block copolymer can be accomodated in the microdomains consisting of the same type of monomeric units, up to a solubility limit that depends on the relative length of the homopolymer and the compolymer block and on the temperature. The order-disorder transition temperature of the block copolymer is also affected by the added homopolymer. At the other extreme of concentration, spherical micelles of block compolymer is formed when a small amount of the copolymer is formed when a small amount of the compolymer is added in the bulk homopolymer, and its critical micelle concentration again depends on the relative length of the molecules and block involved and on the temperature. Measurements were made with light scattering and small-angle X-ray scattering techniques to determine the phase behavior of mixtures containing a styrene-butadiene block copolymer and either a polystyrene or a polybutadiene.
Author | : Mark P. Stoykovich |
Publisher | : |
Total Pages | : 210 |
Release | : 2007 |
Genre | : |
ISBN | : |
Download Directed Self-assembly of Block Copolymers and Ternary Block Copolymer/homopolymer Blends on Chemically Patterned Surfaces Into Device-oriented Geometries Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 816 |
Release | : 1984 |
Genre | : Power resources |
ISBN | : |
Download Energy Research Abstracts Book in PDF, ePub and Kindle
Author | : Ashish Kumar Khandpur |
Publisher | : |
Total Pages | : 434 |
Release | : 1995 |
Genre | : |
ISBN | : |
Download Block Copolymers Book in PDF, ePub and Kindle
Author | : Takeo Araki |
Publisher | : CRC Press |
Total Pages | : 480 |
Release | : 1998-03-03 |
Genre | : Science |
ISBN | : 9780824701420 |
Download Structure and Properties of Multiphase Polymeric Materials Book in PDF, ePub and Kindle
Offers an overview of recent advances in multiphase polymeric materials, ranging from theoretical aspects of polymer miscibility and phase separation kinetics to bulk, surface and interface properties in polymeric materials. This work considers the possibility of a nondestructive methodology to investigative multiphase polymers based mainly on a scattering technique that is sensitive to changes in the phase behaviour of multicomponent polymer systems.
Author | : |
Publisher | : |
Total Pages | : 1196 |
Release | : 1984 |
Genre | : Science |
ISBN | : |
Download Government Reports Announcements & Index Book in PDF, ePub and Kindle
Author | : James J. Watkins |
Publisher | : |
Total Pages | : 3 |
Release | : 1998 |
Genre | : Chemical engineering |
ISBN | : |
Download Phase Separation in Polymer Blends and Block Copolymers Induced by Differential Dilation with CO2 Book in PDF, ePub and Kindle