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Languages : en
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Author: Sibichen Joseph
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Category :
Languages : en
Pages : 0
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The phase segregation investigated in this work is the migration of dispersed particles or droplets to preferred locations in a polymer melt. An understanding of this area can lead to polymer processing directed at de-mixing polymer blends for recycling purposes and at the formation of multi-layer structures of polymers without co-extrusion. Although it is now recognized that viscosity ratio is an important factor in achieving phase segregation in polymer melts, non-Newtonian and elastic effects complicate the situation. This thesis is an investigation of these effects. The thesis centers on testing four hypotheses: (1) phase segregation does not take place in a Newtonian fluid; (2) in a shear thinning fluid having negligible elasticity, migration of the dispersed phase will be towards the high shear rate region of the flow; (3) in a significantly elastic fluid having negligible variation of viscosity with shear rate, migration of the dispersed phase will be towards the low shear rate region of the flow and; (4) in a fluid which is both shear thinning and elastic, the direction and extent of migration will depend upon the relative "strength" of the shear thinning and elastic effects. The validity of these hypotheses was tested using three types of experiments (all conducted at 250°C): melting and shearing a rod of the polymer containing the particles at well defined positions in a Couette apparatus (Couette-Rod Experiments); shearing of a polymer melt containing dispersed phase, which was extruded into the Couette apparatus (Couette-Extrusion Experiments) and; flow of a polymer melt containing the dispersed particles in a very long tube (Tube Experiments). Experiments were performed using both rigid particles (Glass beads) and deformable droplets (Polyamide 612 (PA612) droplets) as the dispersed phase. Polycarbonate (PC) was used as the Newtonian fluid for testing the first hypothesis. Poly(acrylonitrile butadiene styrene) copolymer (ABS) melt served as the test fluid in validating the remaining three hypotheses due to its particular dependence of rheological characteristics upon the shear rate. (Abstract shortened by UMI.).
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Author: Sibichen Joseph
Publisher: National Library of Canada = Bibliothèque nationale du Canada
ISBN: 9780612411821
Category :
Languages : en
Pages : 396
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Author: Rahul Saxena
Publisher:
ISBN:
Category :
Languages : en
Pages : 390
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Author:
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ISBN:
Category : Materials
Languages : en
Pages : 184
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Author: R. J. Roe
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
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In this project a number of polymer blend systems were studied to find the thermodynamic factors controlling the compatibility, such as the temperature, concentration, molecular weight and the copolymer composition, etc. Topics investigated include: The polymer-polymer interaction parameter between polystyrene and polybutadiene was determined, and the applicability of mean field theories (Flory-Huggins theory and the equation-of-state theory) to the polymer miscibility was ascertained. The feasibility of determining the thickness of interfaces between dissimilar polymers by means of small-angle X-ray scattering was critically examined. The occurrence of the order-disorder transition in block copolymer system were investigated. Light scattering and small-angle X-ray scattering were utilized to study the phase transition and phase separation behavior of mixtures of a homopolymer and a block copolymer, and this led to the construction of phase diagrams which exhibit many new features not found with other types of polymer blends. Deuteration of polystyrene was found not to influence its miscibility with polybutadiene. The effectiveness of a random or block copolymer as a compatibilizer of homopolymer blends was investigated. The effect of molecular weight polydipersity on the cloud point curves of polymeric blends was investigated.
Author: Cornelia Vasile
Publisher: BRILL
ISBN: 9004164103
Category : Technology & Engineering
Languages : en
Pages : 660
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Environmentally Degradable Materials (EDPs) should replace petroleum-based plastics where recycling is not viable for logistic or labor cost reason. This book discusses the general background of obtaining such systems, compatibilization methodologies, control of the rate of degradation and final products after degradation, life time assessment, toxicological aspects, applications and market aspects. This book is a complete guide to the subject of biodegradable materials based on multi-component polymeric systems, mainly such as hydrogels, and interpenetrating polymeric networks. This book is a complete guide to the subject of biodegradable materials based on multicomponent polymeric systems such as mainly hydrogels, interpenetrating polymeric networks.
Author: Andreea Irina Barzic
Publisher: CRC Press
ISBN: 149875564X
Category : Science
Languages : en
Pages : 384
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Phase morphology in multicomponent polymer-based systems represents the main physical characteristic that allows for control of the material design and implicitly the development of new plastics. Emphasizing properties of these promising new materials in both solution and solid phase, this book describes the preparation, processing, properties, and practical implications of advanced multiphase systems from macro to nanoscales. It covers a wide range of systems including copolymers, polymer blends, polymer composites, gels, interpenetrating polymers, and layered polymer/metal structures, describing aspects of polymer science, engineering, and technology. The book analyzes experimental and theoretical aspects regarding the thermal and electrical transport phenomena and magnetic properties of crucial importance in advanced technologies. It reviews the most recent advances concerning morphological, rheological, interfacial, physical, fire-resistant, thermophysical, and biomedical properties of multiphase polymer systems. Concomitantly the book deals with basic investigation techniques that are sensitive in elucidating the features of each phase. It also discusses the latest research trends that offer new solutions for advanced bio- and nanotechnologies. Introduces an overview of recent studies in the area of multiphase polymer systems, their micro- and nanostructural evolutions in advanced technologies, and provides future outlooks, new challenges and opportunities. Discusses multicomponent structures that offer enhanced physical, mechanical, thermal, electrical, magnetic, and optical properties adapted to current requirements of modern technologies. Covers a wide range of materials, such as composites, blends, alloys, gels and interpenetrating polymer networks. Presents new strategies for controlling the micro- and nanomorphology and the mechanical properties of multiphase polymeric materials. Describes different applications of multiphase polymeric materials in various fields, including automotive, aeronautics and space industry, displays, and medicine.
Author: Vijayakumar S. RamachandraRao
Publisher:
ISBN:
Category : Chemical engineering
Languages : en
Pages : 3
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Author: Abdulrahman A. Alfarraj
Publisher: ProQuest
ISBN: 9780549286608
Category : Chemical and biological engineering
Languages : en
Pages : 214
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