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 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 Compatibilizing Effect of a Diblock Copolymer of Isotactic Polystyrene and Isotactic Polypropylene in Blends of the Corresponding Homopolymers written by R. E. Cohen and published by . This book was released on 1984 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: A high molecular weight polymer mixture was obtained from a sequential Ziegler-Natta polymerization of styrene and propylene. After removing unwanted homopolymers from the reaction product, the remaining copolymer was subjected to extensive molecular and morphological characterization. The results of these experiments indicate that the purified material is a diblock copolymer of isotactic polystyrene and isotactic polypropylene, with each block having a molecular weight in the range of 225,000 g/mole. This block copolymer was incorporated in varying amounts into blends of isotactic polystyrene and isotactic polypropylene homopolymers. At low concentrations of copolymer, the diblock functions as a dispersing agent, significantly reducing the size of domains in the heterogeneous blends. At higher copolymer concentrations, a dramatic improvement in the adhesion across the domain boundaries is also observed. The favorable effects of the copolymer on mechanical properties are demonstrated in the results of tensile impact experiments.

Download or read book Polystyrene written by J. R. Wünsch and published by iSmithers Rapra Publishing. This book was released on 2000 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: This review describes the production of styrene polymers in detail, including the synthesis of raw materials, polymerisation routes to polystyrene, production of high impact polystyrene and anionic block copolymers. The review also describes the mechanical properties of styrenic polymers, their electrical properties, and their behaviour in fire. An additional indexed section containing several hundred abstracts from the Rapra Polymer Library database gives useful references for further reading.

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 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 Physical Properties and Morphology of Blends of Polyisoprene and Polybutadiene with Corresponding Diblock Copolymers written by Alonso Rafael Ramos Vaca and published by . This book was released on 1977 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Research in Materials written by Massachusetts Institute of Technology and published by . This book was released on 1992 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Research in Materials written by and published by . This book was released on 1992 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Structure and Properties of Rubbery Diblock Copolymers and Polymer Blends Containing 1 2 Polybutadiene written by Jose Maria Torradas and published by . This book was released on 1982 with total page 858 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Role of Particle Morphology on Toughness in Binary and Ternary Blends of Polybutadiene polystyrene Block Copolymers and Homopolymers written by Osman S. Gebizlioglu and published by . This book was released on 1985* with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Engineered Materials Abstracts written by and published by . This book was released on 1994-04 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 1460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Download or read book Rheology Phase Behavior and Morphology of Blends Containing Diblock Copolymers written by Nitin Yadunath Vaidya and published by . This book was released on 1999 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book CRYSTALLIZATION KINETICS AND MORPHOLOGY OF ISOTACTIC POLYSTYRENE BLENDS written by STEVEN LEE LAMBERT and published by . This book was released on 1970 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ACS Directory of Graduate Research 1993 written by American Chemical Society. Committee on Professional Training and published by . This book was released on 1993 with total page 1700 pages. Available in PDF, EPUB and Kindle. Book excerpt: