Download or read book Comparative Study of Atactic and Isotactic Polystyrene polybutadiene Block Copolymers written by Jeffrey Gilbert Killian and published by . This book was released on 1989 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Characterization of Isotactic Polystyrene Polybutadiene Block Copolymers written by L. Cazzaniga and published by . This book was released on 1988 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Download or read book Synthesis and Morphology of Isotactic Polystyrene polybutadiene Diblock Copolymers and Blends written by Luigi Aldolfo Cazzaniga and published by . This book was released on 1991 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Morphology of Polystyrene polybutadiene Heteroarm Star Block Copolymers written by April Harrison-Boddie and published by . This book was released on 1995 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Toward a Block Copolymer Emulsified Tough Blend of Isotactic Polystyrene and Polybutadiene HIiPS written by and published by . This book was released on 1991 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes our efforts to obtain mechanically tough compositions based on the brittle semicrystalline homopolymer isotactic polystyrene. The approach outlined in the report includes the anionic synthesis of isotactic polystyrene (iPS) and diblock copolymers of iPS and polybutadiene (PB) rubber. The diblocks were successful in emulsifying pools of rubber in blends of iPS and PB. A micromechanical toughness test was developed and used to demonstrate the dramatically enhanced toughness of the emulsified blends over the toughness of either the iPS homopolymer or of binary blends of iPS and PB.
Download or read book Block Copolymers of Isotactic Polypropylene and 1 4 Polybutadiene written by M. A. Drzewinski and published by . This book was released on 1985 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two block copolymers of isotactic polypropylene and 1,4 polybutadiene were synthesized using techniques involving a transformation from anionic to Ziegler-Natta polymerization mechanisms. The yield of block copolymer was about fifteen percent (weight basis) in both polymerizations, the remainder being unreacted polybutadiene from the first block synthesis. Molecular characterization experiments and model reactions were consistent with a block-like structure for the copolymers; definitive evidence for the proposed molecular structure was obtained through transmission electron microscopy which clearly revealed microphase-separated morphologies characteristic of block copolymers. (Author).
Download or read book Diblock Copolymers of Polystyrene 1 2 Polybutadiene and Polystyrene Polybutene 1 Molecular Structure Morphology and Mechanical Properties written by R. E. Cohen and published by . This book was released on 1984 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: A novel set of diblock copolymers has been examined in various molecular and morphological characterization experiments, in small amplitude dynamic mechanical tests and in large deformation experiments. In all of the materials studied, one of the block sequences is atactic polystryrene; the second block is comprised of either 1,2 polybutadiene (essentially 100% vinyl adduct and atactic microstructure) or its hydrogenated product, polybutene-1 (also atactic). There is a pronounced influence of the hydrogenation of the rubbery phase on the morphology and the properties of the diblock copolymers.
Download or read book Syndiotactic Polystyrene written by Jürgen Schellenberg and published by John Wiley & Sons. This book was released on 2009-10-29 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt: Syndiotactic Polystyrene (SPS), synthesized in a laboratory for the first time in 1985, has become commercialized in a very short time, with wide acceptance on the global plastics market. Written by leading experts from academia and industry from all over the world, Syndiotactic Polystyrene offers a comprehensive review of all aspects of SPS of interest to both science and industry, from preparation and properties to applications. This essential reference to SPS covers: The preparation of syndiotactic polystyrene by half-metallocenes and other transition metal catalysts The structure and fundamental properties, especially morphology and crystallization and solution behavior The commercial process for SPS manufacturing Properties, processing, and applications of syndiotactic polystyrenes Polymers based on syndiotactic polystyrenes, for example, by functionalization and modification, and nanocomposites Ideal for polymer chemists, physicists, plastics engineers, materials scientists, and all those dealing with plastics manufacturing and processing, this important resource provides the information one needs to compare, select, and integrate an appropriate materials solution for industrial use or research.
Download or read book Craze Plasticity in a Series of Polystyrene polybutadiene Di block Copolymers with Spherical Morphology written by Chris Edward Schwier and published by . This book was released on 1985* with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Engineering Index Annual written by and published by . This book was released on 1992 with total page 2264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since its creation in 1884, Engineering Index has covered virtually every major engineering innovation from around the world. It serves as the historical record of virtually every major engineering innovation of the 20th century. Recent content is a vital resource for current awareness, new production information, technological forecasting and competitive intelligence. The world?s most comprehensive interdisciplinary engineering database, Engineering Index contains over 10.7 million records. Each year, over 500,000 new abstracts are added from over 5,000 scholarly journals, trade magazines, and conference proceedings. Coverage spans over 175 engineering disciplines from over 80 countries. Updated weekly.
Download or read book Acid Functionalized Polystyrene Containing Block Copolymers for Proton Exchange Membrane Fuel Cell written by Bhagyashree Date and published by . This book was released on 2014 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Crazing in Polystyrene polybutadiene Di block Copolymers Containing Cylindrical Polybutadiene Domains written by Chris Edward Schwier and published by . This book was released on 1985* with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Multi Dimensional Liquid Chromatography written by Dwight R. Stoll and published by CRC Press. This book was released on 2022-12-30 with total page 401 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-dimensional liquid chromatography (2D-LC) is finding increasingly wide application principally due to the analysis of mixtures of moderate to high complexity. Many industries are developing increasingly complex products that are challenging the separation capabilities of state-of-the-art 1D-LC and need new analytical methodologies with substantially more resolving power, and 2D-LC meets that need. This text, organized by two leaders in the field, establishes a sound fundamental basis for the principles of the technique, followed by a discussion of important practical considerations. The book begins with an introduction to multi-dimensional separations and a discussion of the history and development of the technique over the past 40 years, followed by several chapters that provide a theoretical basis for development of 2D-LC methods, including foundational concepts regarding separation complementarity, under-sampling, and dynamics of liquid chromatography separations. Instrumentation for 2D-LC is discussed extensively, including practical aspects such as interface selection and setup. Building on this foundation, two separate chapters are focused on method development for non-comprehensive and comprehensive separations, followed by a chapter dedicated to data analysis. Finally, applications of 2D-LC in several fields ranging from pharmaceutical analysis to polymer science are summarized. The book is an important resource for both students and practitioners who are already using 2D-LC or are interested in getting started in the field. Key Features: Demonstrates the conditions under which a 2D-LC method should be considered as an alternative to a 1D-LC method Establishes a sound fundamental basis of the principles of the technique, followed by guidelines for method optimization Provides a single source for technical knowledge advances and practical guidance described in recent literature Assists with the initial decision to develop a 2D-LC method Guides the reader in developing a high-quality method that meets the needs of their application
Download or read book Engineering Index written by and published by . This book was released on 1969 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comprehensive Dissertation Index written by University Microfilms International and published by Ann Arbor, Mich. : University Microfilms International. This book was released on 1984 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comprehensive Desk Reference of Polymer Characterization and Analysis written by Robert F. Brady and published by . This book was released on 2003 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a practical manual for those who analyze polymers. Self-contained chapters describe when a technique should be selected, explain its basic principles, describe how instruments are constructed and operated, and teach how the data obtained relate to molecular structure and physical properties. Many clear illustrations are included. Implicit memory refers to a change in task performance due to an earlier experience that is not consciously remembered. This book is not a research manual but rather a guide to performing and understanding polymer characterization and an introduction to the specialized literature of the analytical chemistry of polymers. The techniques covered are directly relevant to the characterization of synthetic polymers such as adhesives, sealants, polymers, composites, coatings, elastomers, rubber, and other nonmetallic materials. Many techniques are also quite useful for natural and biological polymers.
Download or read book Engineered Materials Abstracts written by and published by . This book was released on 1994-10 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt:
