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Morphology And Phase Transitions In Styrene Butadiene Styrene Triblock Copolymer Grafted With Isobutyl Substituted Polyhedral Oligomeric Silsesquioxanes Postprint
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Book Synopsis Morphology and Phase Transitions in Styrene-Butadiene-Styrene Triblock Copolymer Grafted with Isobutyl Substituted Polyhedral Oligomeric Silsesquioxanes (Postprint). by :
Download or read book Morphology and Phase Transitions in Styrene-Butadiene-Styrene Triblock Copolymer Grafted with Isobutyl Substituted Polyhedral Oligomeric Silsesquioxanes (Postprint). written by and published by . This book was released on 2006 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two symmetric triblock polystyrene-butadiene-polystyrene (SBS) copolymers with different styrene content were grafted with varying amounts of isobutyl-substituted polyhedral oligomeric silsesquioxane (POSS) molecules. The POSS octamers, R'R7Si8O12 were designed to contain a single silane functional group, R', which was used to graft onto the dangling 1,2 butadienes in the polybutadiene block and seven identical organic groups, R=isobutyl (iBu). Morphology and phase transitions of these iBu-POSS modified SBS were investigated using small angle X-ray scattering and rheological methods. It was observed that POSS with isobutyl moiety, when grafted to the polybutadiene (PB), appears to show a high affinity to stay within the PB domain; effectively, they enhance the segregation between butadiene and styrene domains. This causes a shift in the phase diagram to lower styrene content. From the rheology, we observed that values of storage modulus, G', at temperatures below the order-disorder transition increase due to the grafting of iBu-POSS. These observations lead us to conclude that the local order morphology between styrene and butadiene domains was better preserved due to the enhanced segregation forced by iBu-POSS.
Book Synopsis Characterization of the Thermodynamics and Deformation Behavior of Styrene-butadiene-styrene Grafted with Polyhedral Oligomeric Silsesquioxanes by : Daniel B. Drazkowski
Download or read book Characterization of the Thermodynamics and Deformation Behavior of Styrene-butadiene-styrene Grafted with Polyhedral Oligomeric Silsesquioxanes written by Daniel B. Drazkowski and published by . This book was released on 2007 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Styrene-butadiene-styrene Tri-block Copolymers Modified Wit Polyhedral Oligomeric Silsesquioxanes by :
Download or read book Styrene-butadiene-styrene Tri-block Copolymers Modified Wit Polyhedral Oligomeric Silsesquioxanes written by and published by . This book was released on 2004 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: A novel hybrid organic/inorganic tri-block copolymer of polystyrene-butadiene-polystyrene (SBS) containing grafted polyhedral oligomeric silsesquioxane (POSS) molecules was synthesized by a hydrosilation method. The POSS molecules were designed to contain a single silane functional group, which was used to graft onto the dangling 1,2 butadienes in the polybutadiene soft block. Unlike typical free radical copolymerizations commonly used for many other POSS incorporations investigated, this synthesis method allows us to make a series of polymers with varying amounts of POSS without any change to the overall degree of polymerization or structure of the main SBS backbone. This gives us a unique opportunity to study the POSS behavior in the matrix and know that all differences are solely due to the POSS grafted to the soft continuous butadiene phase. X-ray diffraction revealed that the grafted POSS are very well dispersed in the matrix of the hybrid polymer, which is compared to the strong phase segregation observed in a POSS physical blend. Small-angle X-ray scattering indicates that although the cylindrical morphology attributed to the styrene component was not altered by the presence of POSS, but attachment of POSS to the continuous phase (polybutadiene block) causes the packing of discrete phase (polystyrene blocks) to lack long-range features. Results of dynamic mechanical analysis showed that the POSS has sterically hindered the motion of the polybutadiene blocks. More interestingly, the presence of POSS in the soft segments also resulted in a tapered tan peak associated with the glass transition of polystyrene and a higher tensile strength when deformed at temperature near Tg of polystyrene without affecting the elongational behavior of SBS at temperatures above Tg of polybutadiene.
Book Synopsis Phase Transitions in the Mixtures of Styrene-butadiene Diblock Copolymer with Styrene Homopolymer, Butadiene Homopolymer Or Styrene-butadiene Random Copolymer by : Wang-Cheol Zin
Download or read book Phase Transitions in the Mixtures of Styrene-butadiene Diblock Copolymer with Styrene Homopolymer, Butadiene Homopolymer Or Styrene-butadiene Random Copolymer written by Wang-Cheol Zin and published by . This book was released on 1983 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Morphology of Styrene-butadiene-styrene Block Copolymers by : Geoffrey Edward Attenburrow
Download or read book Morphology of Styrene-butadiene-styrene Block Copolymers written by Geoffrey Edward Attenburrow and published by . This book was released on 1972 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Shear Induced Structure in a Heterogeneous Triblock Copolymer (Styrene-Butadiene-Styrene) by : Steven Friedrich
Download or read book Shear Induced Structure in a Heterogeneous Triblock Copolymer (Styrene-Butadiene-Styrene) written by Steven Friedrich and published by . This book was released on 1984 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Morphology and Mechanical Properties of Styrene, Butadience Triblock Copolymers by : Geoffrey Edward Attenburrow
Download or read book Morphology and Mechanical Properties of Styrene, Butadience Triblock Copolymers written by Geoffrey Edward Attenburrow and published by . This book was released on 1974 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structure-mechanical Property Relationship of Styrene-butadiene-styrene Triblock Copolymer at High Pressure by : Byongil Min
Download or read book Structure-mechanical Property Relationship of Styrene-butadiene-styrene Triblock Copolymer at High Pressure written by Byongil Min and published by . This book was released on 1990 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structure-mechanical Property Relationship of Styrene-butadiene-styrene Triblock Copolymer at High Pressure /c by : Byongil Min
Download or read book Structure-mechanical Property Relationship of Styrene-butadiene-styrene Triblock Copolymer at High Pressure /c written by Byongil Min and published by . This book was released on 1990 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The structure-property relationship of polymer blends containing styrene-butadiene-styrene triblock copolymers by : Linda Sue Flosenzier
Download or read book The structure-property relationship of polymer blends containing styrene-butadiene-styrene triblock copolymers written by Linda Sue Flosenzier and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Morphological Behavior of Sulfonated Styrene-Ethylene/Propylene-Styrene Triblock Copolymers by :
Download or read book Morphological Behavior of Sulfonated Styrene-Ethylene/Propylene-Styrene Triblock Copolymers written by and published by . This book was released on 2006 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sulfonated block copolymer ionomers possessing short (1K g/mol) styrene blocks and various rubber block lengths were synthesized via sequential anionic polymerization of styrene, isoprene, and styrene followed by hydrogenation and sulfonation. The ionomers were then characterized by small-angle x-ray scattering (SAXS) and atomic force microscopy (AFM). The SAXS data indicate the presence of microphase-separated sulfonated styrene domains within the rubber phase. The morphology of the phase separation in this system is not clear from SAXS due to the absence of higher order maxima. Increased Bragg spacing was observed as the rubber block molecular weights increased, but decreased upon neutralization of the sulfonic acid groups with sodium hydroxide. The intensity of the SAXS maxima increased for shorter rubber block segments. AFM images confirmed the presence of microphase-separated domains which appear spherical.
Book Synopsis Correlation Between Molecular Architecture, Morphology and Deformation Behaviour of Styrene/butadiene Block Copolymers and Blends by : Rameshwar Adhikari
Download or read book Correlation Between Molecular Architecture, Morphology and Deformation Behaviour of Styrene/butadiene Block Copolymers and Blends written by Rameshwar Adhikari and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Phase Transition, Rheology, and Morphology of Block Copolymers and Side-chain Liquid-crystalline Polymers by : Kyung Min Lee
Download or read book Phase Transition, Rheology, and Morphology of Block Copolymers and Side-chain Liquid-crystalline Polymers written by Kyung Min Lee and published by . This book was released on 2002 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Morphology on the Sorption and Diffusion Behavior of Styrene-butadiene Block Copolymers by : Christopher L. Mirley
Download or read book Effects of Morphology on the Sorption and Diffusion Behavior of Styrene-butadiene Block Copolymers written by Christopher L. Mirley and published by . This book was released on 1985 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Manipulating Phase Behavior in Block Copolymers Using Polydispersity by :
Download or read book Manipulating Phase Behavior in Block Copolymers Using Polydispersity written by and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of polydispersity, or broad molecular weight distributions, on the phase behavior of block copolymer melts and thin films are systematically explored. Linear AB diblock, ABA triblock, and BAB triblock copolymers are synthesized with continuous polydispersity in the B block (Mw/Mn 8́ơ 1.70́32.0) and relatively monodisperse A blocks (Mw/Mn 8́ơ 1.10́31.3) to understand how the self0́3assembly of polydisperse block copolymers can be altered with chain architecture and block connectivity. Broad dispersity in the M block of poly(styrene0́3b0́3methyl methacrylate) (SM) diblock copolymer melts induces domain dilation and morphological transitions to higher M block volume compositions with respect to predictions for monodisperse SM diblock copolymers. A comparison between poly(styrene0́3b0́31,40́3butadiene0́3b0́3styrene) triblock copolymers (SBS) with mid0́3block (B) polydispersity and poly(methyl methacrylate0́3b0́3styrene0́3b0́3methyl methacrylate) triblock copolymers (MSM) with outer0́3block (M) polydispersity reveals that the location of the polydisperse block and how it is connected to the other blocks is critical. Center block polydispersity in SBS, where one block is constrained at two block junctions, leads to a lamellar phase window shift to higher volume fractions of B, increases in domain periodicity, and the stabilization of a new, disordered bicontinuous morphology. The domain periodicity in the MSM triblocks with outer M block polydispersity is at least twice that predicted for monodisperse MSM triblock copolymers. However, in contrast to the SBS triblocks, the polydisperse MSM triblocks exhibit a lamellar phase window shift to lower M block compositions. The behavior of the SBS and MSM triblock copolymers is clarified in the context of the chain architectures present in the melts resulting from the block polydispersity. Preliminary studies of the thin film behavior of the SM diblock and MSM triblock copolymers revealed that despite the polydispersity of the M block, perpendicular microdomain orientation can be achieved. The MSM triblock copolymer thin films exhibit film thickness0́3dependent morphological behavior arising from a confluence of M outer0́3block polydispersity and the presence of a random brush0́3modified substrate. In summation, this dissertation demonstrates that polydispersity can be used to manipulate the phase behavior of block copolymer melts and thin films and may facilitate access to new materials with potentially useful properties.
Book Synopsis Tuning Melt-phase Morphology in Block Copolymers Using Block Dispersity by :
Download or read book Tuning Melt-phase Morphology in Block Copolymers Using Block Dispersity written by and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Block copolymers non-linearly combine the properties of two different homopolymers into a single material, by virtue of the connectivity between the two distinct homopolymer segments. Their microphase separation at the nanoscale leads to the formation of interesting and useful microstructures, such as spheres and cylinders ordered on regular lattices with high degrees of long-range order. The advent of newer controlled radical and tandem polymerization techniques enables the enchainment of an ever increasing number of functional monomers with new properties, yet these techniques typically result in copolymers with broader molecular weight dispersities. A thorough understanding of the morphological consequences of increased molecular weight dispersity in one or more segments in a block copolymer will enable the development of new materials incorporating unusual monomers with new chemical functionalities and properties. Herein, we describe the synthesis and characterization of a library of poly(lactide-b-1,4-butadiene-b-lactide) (LBL) triblock copolymer samples with broad dispersity center segments, and we compare their melt-phase self-assembly behavior to previously reported polydisperse SBS triblock copolymers. Based on these comparisons, we rationalize the dramatically different behaviors of the two systems in terms of specific chain packing arrangements that depend upon the degree of chemical incompatibility of the copolymer system. In an attempt to mimic the most important molecular heterogeneities of continuously polydisperse copolymers as identified by our studies, we designed bidisperse blends of triblock copolymers and studied their morphological and uniaxial mechanical properties. As with continuously polydisperse copolymers, these blends also adopted bicontinuous morphologies with substantial mechanical toughness. In the latter part of this thesis, we investigate the influence of macromolecular dispersity on the macrophase separation behavior of mixtures of poly(vinyl alcohol) (PVA) and poly(ethylene oxide) (PEO) co-dissolved in water. The location of the concentration-dependent phase boundary, which separates the phase separated and phase mixed regions, is shown to depend on both the average molecular weight and dispersity of the polymeric components. Colloidal and copolymer surfactant additives are further shown to improve ATPS emulsion stability at higher temperatures and to mitigate emulsion coarsening.
Book Synopsis Semiconductor Device Reliability by : A. Christou
Download or read book Semiconductor Device Reliability written by A. Christou and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 571 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication is a compilation of papers presented at the Semiconductor Device Reliabi lity Workshop sponsored by the NATO International Scientific Exchange Program. The Workshop was held in Crete, Greece from June 4 to June 9, 1989. The objective of the Workshop was to review and to further explore advances in the field of semiconductor reliability through invited paper presentations and discussions. The technical emphasis was on quality assurance and reliability of optoelectronic and high speed semiconductor devices. The primary support for the meeting was provided by the Scientific Affairs Division of NATO. We are indebted to NATO for their support and to Dr. Craig Sinclair, who admin isters this program. The chapters of this book follow the format and order of the sessions of the meeting. Thirty-six papers were presented and discussed during the five-day Workshop. In addi tion, two panel sessions were held, with audience participation, where the particularly controversial topics of bum-in and reliability modeling and prediction methods were dis cussed. A brief review of these sessions is presented in this book.
