Effect Of Molecular Weight Of Added Polystyrene On The Order Disorder Transition Of Styrene Butadiene Diblock Copolymer
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Author | : S. Nojima |
Publisher | : |
Total Pages | : 56 |
Release | : 1987 |
Genre | : |
ISBN | : |
The change in the order disorder transition temperature of block copolymer, induced by the addition of homopolymer, is investigated. Analysis of the theoretical expression based on the random phase approximation shows that the direction of the change in the transition temperature is determined by the length of the added homopolymer in relation to the length of the block copolymer and the overall composition of the monomers in the mixture. Small-angle x ray scattering measurements are performed with mixtures containing a styrene butadiene diblock copolymer and a polystyrene of various molecular weight. The observed shape of the scattered intensity curve, the angular position of the peak intensity, and the spinodal temperature for the micro-phase separation all agree well with the prediction from the theory. The values of the interaction energy density determined from the results agree fairly well with values determined previously from cloud point data. Keywords. Block copolymer, Order disorder transition, Miscibility, Polystyrene, Styrene butadiene block copolymer, Small angle X ray scattering.
Author | : P.M. Visakh |
Publisher | : Woodhead Publishing |
Total Pages | : 344 |
Release | : 2016-08-24 |
Genre | : Technology & Engineering |
ISBN | : 0081004273 |
Recent Developments in Polymer Macro, Micro and Nano Blends: Preparation and Characterisation discusses the various types of techniques that are currently used for the characterization of polymer-based macro, micro, and nano blends. It summarizes recent technical research accomplishments, emphasizing a broad range of characterization methods. In addition, the book discusses preparation methods and applications for various types of polymer-based macro, micro, and nano blends. Chapters include thermoplastic-based polymer & nano blends, applications of rubber based and thermoplastic blends, micro/nanostructures polymer blends containing block copolymers, advances in polymer-inorganic hybrids as membrane materials, synthesis of polymer/inorganic hybrids through heterophase polymerizations, nanoporous polymer foams from nanostructured polymer blends, and natural polymeric biodegradable nano blends for protein delivery. Describes the techniques pertaining to a kind (or small number) of blends, showing specific examples of their applications Covers micro, macro, and nano polymer blends Contains contributions from leading experts in the field
Author | : |
Publisher | : |
Total Pages | : 520 |
Release | : 1987 |
Genre | : Science |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 766 |
Release | : 1989 |
Genre | : Polymers |
ISBN | : |
Author | : Istvan Benedek |
Publisher | : CRC Press |
Total Pages | : 420 |
Release | : 2006-03-01 |
Genre | : Technology & Engineering |
ISBN | : 904741196X |
Growing interest in the formulation of pressure-sensitive adhesives as described in the first edition of this book ( Pressure-Sensitive Formulation, VSP, 2000) required a new, enlarged edition including the design of pressure-sensitive adhesives as a separate volume. Developments in the understanding of pressure sensitivity were necessary to use ma
Author | : Istvan Benedek |
Publisher | : CRC Press |
Total Pages | : 378 |
Release | : 2020-06-07 |
Genre | : Science |
ISBN | : 1000083098 |
Growing interest in the formulation of pressure-sensitive adhesives as described in the first edition of this book ( Pressure-Sensitive Formulation, VSP, 2000) required a new, enlarged edition including the design of pressure-sensitive adhesives as a separate volume. Developments in the understanding of pressure sensitivity were necessary to use macromolecular chemistry for pressure-sensitive design. Such developments include polymer physics and contact mechanics. Progress in coating technology, especially in in-line coating- and synthesis, opened new ways for the design of pressure-sensitive adhesives and products as well. Actually, pressure-sensitive-products with and without adhesives compete requiring a broad variety of material formulations and the corresponding manufacturing technology. The first volume of the book examines the theoretical aspects of pressure-sensitive design, based on macromolecular chemistry, macromolecular physics, rheology and contact mechanics. The second volume describes the practical aspects of pressure-sensitive design and formulation, related to product application. The advances in the various domains are described by specialists.
Author | : J. R. Wünsch |
Publisher | : iSmithers Rapra Publishing |
Total Pages | : 180 |
Release | : 2000 |
Genre | : Technology & Engineering |
ISBN | : 9781859571910 |
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.
Author | : T. T. Jones |
Publisher | : Elsevier |
Total Pages | : 21 |
Release | : 2013-10-22 |
Genre | : Science |
ISBN | : 1483139298 |
The Effect of Molecular Orientation on the Mechanical Properties of Polystyrene presents the results of a study that investigated the effect of molecular orientation on the mechanical properties of polystyrene. Oriented sheets of two commercial homopolystyrenes (PSA and PSB) differing in molecular weight, rheological and glass transition temperature properties were prepared by sheet extrusion and drawing. The properties of the resulting sheets were examined at seven different laboratories in Europe. The study focused on length reversion ratio, birefringence, orientation stress, shrinkage stress, and various mechanical properties such as rupture stress and strain, the specific energy of rupture, and sonic modulus and relaxation modulus. Impact behavior and environmental stress cracking behavior were also evaluated. One of the findings was that oriented polymers subjected to lateral strains can develop catastrophic crack growth when immersed in an active liquid. The onset of the cracks depends on the lateral strain imposed as well as the degree of orientation. PSB was more resistant than PSA. This monograph should be a useful resource for chemists.
Author | : |
Publisher | : |
Total Pages | : 942 |
Release | : 1992-07 |
Genre | : Ceramic materials |
ISBN | : |
Author | : Gity Mir Mohamad Sadeghi |
Publisher | : Elsevier Inc. Chapters |
Total Pages | : 121 |
Release | : 2013-11-28 |
Genre | : Technology & Engineering |
ISBN | : 0128090847 |
Block copolymers (BCPs) consist of two or more chemically different polymers connected covalently, and are polymer alloys. Due to their thermodynamic incompatibility and chain connectivity, the phase separation between two (or more) blocks occurs only in a tens of nanometers range. Nanostructures are based on block copolymer self-assembly. They are functional nanomaterials less than 100nm in size and have received extensive scientific and technological attention due to their potential applications in electronic, biomedical, and optical materials. This chapter examines a variety of different synthetic strategies for preparation of linear diblock copolymers by anionic polymerization. Triblocks can be synthesized according to an appropriate synthetic pathway, depending on the monomers used and their sequence in the triblock chain. Nonlinear block copolymers including star block copolymers, graft copolymers, miktoarm star copolymers, cyclic block copolymers, and other complex architectures are explained. Microphase separation drives BCPs to self-assemble, resulting in ordered nanostructures, including spheres, cylinders, gyroids, and lamellae, depending on the composition of the BCP. In nanotechnology, self-assembly (SA) underlies various types of molecular structures built from nanoparticles, nanotubes, or nanorods. Supramolecular structures generated from amphiphilic block copolymers are characterized by a slow rate of intermicellar chain exchange which makes them interesting for a variety of applications. Basic principles of self-assembly and micellization of block copolymers in dilute solution, methods for stabilization of the macromolecular aggregates, are discussed. Stabilized nanoparticles, the so-called “smart materials,” which show responses to environmental changes (pH, temperature, ionic strength, etc.), are presented with a focus on their applications.