Phase Behaviour Of Polyolefin Blends Under Melt Flow
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Phase Behaviour Of Polyolefin Blends Under Melt Flow
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Author : Richard A. Venables
language : en
Publisher:
Release Date : 2003
Phase Behaviour Of Polyolefin Blends Under Melt Flow written by Richard A. Venables and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Polymers categories.
Polyolefin Blends
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Author : Domasius Nwabunma
language : en
Publisher: Wiley-Interscience
Release Date : 2008-01-02
Polyolefin Blends written by Domasius Nwabunma and has been published by Wiley-Interscience this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-01-02 with Technology & Engineering categories.
The definitive reference on the properties and applications of polyolefin blends Polyolefins account for more than half of total plastics consumption in the world. In recent years, usage of and research on polyolefin blends have increased significantly due to new applications in medicine, packaging, and other fields and the development of novel polyolefins. With a special emphasis on nano- and micro-structures of crystals and phase morphology, Polyolefin Blends condenses and consolidates current information on polyolefins so that the reader can compare, select, and integrate a material solution. Focusing exclusively on the fundamental aspects as well as applications of polyolefin blends, this authoritative reference: * Features an introductory chapter that serves as a guide to polyolefin blends * Includes chapters covering formulation design, processing, characterization, modeling and simulation, engineering performance properties, and applications * Covers polyolefin/polyolefin blends and polyolefin/non-polyolefin blends * Discusses miscibility, phase behavior, functionalization, compatibilization, microstructure, crystallization, hierarchical morphology, and physical and mechanical properties * Covers new research trends including in-situ reactor blending and reactive processing, such as compatibilization/functionalization in the melt * Contains practical examples from open literature sources and commercial products With chapters contributed by leading experts from several countries, this is a must-have reference for scientists and engineers conducting research on polyolefin blends and for professionals in medical, packaging, and other commodity fields. It is also an excellent text for graduate students studying polymer science and polymer processing.
Phase Behavior And Morphology Of Polymer Blend Under High Flow Rate
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Author : Piyawit Koombhongse
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2014
Phase Behavior And Morphology Of Polymer Blend Under High Flow Rate written by Piyawit Koombhongse and has been published by LAP Lambert Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Technology & Engineering categories.
The effect of flow is of industrial relevance in melt extrusion and injection molding where temperature gradients and high deformation rates are encountered. This demands a better understanding of the flow dependence of the phase behavior in polymer blends since the morphology and properties of the finished product are influenced to great extent by the details of dynamics of the flowing melt. Experimentally both shear induced mixing and shear induced demixing phenomena have been observed under a variety of operational conditions. The primary objective of this book is to explain the phase behavior under industrially realistic deformation rates using a partially miscible SAN/PMMA blend as an example and to clarify the effect of shear flow on morphology of injection-molded sample. The reader will briefly learn the basic Thermodynamics of phase separation, Thermodynamics of polymer blends, and how to detect polymer miscibility by using Raman Spectroscopy and other techniques. The effect of shear flow on phase behavior of polymer blend is demonstrated theoretically and experimentally.
Phase Behavior Of Polymer Blends
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Author : Karl Freed
language : en
Publisher: Springer Science & Business Media
Release Date : 2005-09-01
Phase Behavior Of Polymer Blends written by Karl Freed and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-09-01 with Technology & Engineering categories.
Properties And Foaming Behaviour Of Thermoplastic Olefin Blends Based On Linear And Branched Polypropylene
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Author : Tara J. McCallum
language : en
Publisher:
Release Date : 2007
Properties And Foaming Behaviour Of Thermoplastic Olefin Blends Based On Linear And Branched Polypropylene written by Tara J. McCallum and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
The recent commercial availability of branched polypropylenes (PPs) combined with the advent of single-site metallocene catalysts has ignited interest in thermoplastic polyolefin blends (TPOs) with controlled melt strength. These blends have potential applications in a variety of industries including foam processing and extrusion foaming. The main objective of the thesis is to provide a detailed investigation on the rheological, morphological, thermal, mechanical and foaming properties of isotactic polypropylene / high melt strength branched polypropylene homopolymer blends, and of thermoplastic olefin blends using these polypropylenes as matrices. Initial research on the polypropylene blends consisted of a linear high melt flow rate PP and two branched PPs with different melt flow rates. Blends containing branched PPs display evidence of miscibility in the melt state and exhibit high melt elasticity together with significant strain hardening in extensional deformation while retaining good flow properties. Of the two blend systems examined, the blends containing linear and branched PPs with similar melt flow rates have better mechanical properties, higher crystallization temperatures, and higher crystallinities. An investigation into the mechanical, thermal, rheological, morphological, and microcellular foaming behaviour of TPO blends consisting of a blended matrix of linear and branched PP with a dispersed phase of an ethylene-octene copolymer was performed. Blends containing branched PP showed improved stiffness and flexural properties. Given that the morphology and interfacial tension of the blends remain virtually unaffected, these improvements are attributed to the increased crystallinity in the presence of a branched component with higher molecular weight. Varying the amount of branched PP into linear PP during foaming experiments in a batch foaming simulation apparatus caused slower cell growth rates and decreased cell densities, while TPO foams showed polydispersity in the cell sizes, possibly due to the different foaming characteristics of the immiscible components. The addition of talc to TPO blends aims at improving the stiffness and dimensional stability of the material, while lowering material costs. Blends of linear and branched PP with an ethylene-octene copolymer dispersed phase and uncalcinated talc showed similar trends, as well as an expected drop in the elongation at break. There was an increase in the viscosity and crystallinity of the blends, and optimum gains were seen in blends containing 20 wt% branched PP. Increasing the levels of branched PP did not significantly affect the bubble growth rate, or the final cell density during foaming experiments.
Melt And Solid State Behaviour Of Polyolefin Blends
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Author : Siavash Haghighat
language : en
Publisher:
Release Date : 1990
Melt And Solid State Behaviour Of Polyolefin Blends written by Siavash Haghighat and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.
Phase Behavior Of Polymer Blends
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Author : Karl Freed
language : en
Publisher: Springer
Release Date : 2009-09-02
Phase Behavior Of Polymer Blends written by Karl Freed and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-09-02 with Technology & Engineering categories.
Phase Behavior Study In Thin Film Polyolefin Blends
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Author : Maulik A. Modi
language : en
Publisher:
Release Date : 1999
Phase Behavior Study In Thin Film Polyolefin Blends written by Maulik A. Modi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Chemical engineering categories.
Polymer Blends
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Author : L.A. Utracki
language : en
Publisher: iSmithers Rapra Publishing
Release Date : 2000
Polymer Blends written by L.A. Utracki and has been published by iSmithers Rapra Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Technology & Engineering categories.
This report begins by summarising the basis of polymer blending. This includes an outline of the techniques being used to characterise blends including spectroscopic techniques and rheometry. The types of polymer blends which have been studied are outlined. Methods of compatibilisation are discussed. The morphology of the phases in a blend is critical to property development - the types of morphology observed are described. Flow-induced morphology is described. Processing of blends and the effects on morphology are discussed including extrusion, thermoforming, blow moulding, injection moulding and foaming. The accompanying abstracts from the Rapra Polymer Library database provide useful further information and indicate sources of additional material.
Polyolefin Miscibility Solid State Nmr Investigation Of Phase Behavior In Saturated Hydrocarbon Blends
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Author :
language : en
Publisher:
Release Date : 2010
Polyolefin Miscibility Solid State Nmr Investigation Of Phase Behavior In Saturated Hydrocarbon Blends written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Polyolefin blends represent a vital material field due to their economic and commercial importance. Potential new properties such as lighter weight, lower cost and higher strength, motivate research to investigate blends of saturated hydrocarbon polymers. However, many questions remain concerning how polymer chain structure and packing influence local thermodynamics, or more specifically, the interplay between enthalpy and entropy, which ultimately control bulk phase behavior. Solid-state NMR has proven to be an essential tool in these studies due to its ability to selectively observe molecular level conformations and dynamics without isotopic labeling. Combinations of basic and advanced variable temperature studies such as 1D and 2D 13C cross-polarization exchange experiments, static 2H lineshape analysis, 1H relaxation/spin-diffusion measurements, and 129Xe experiments were applied in this work. Several systems were studied, including 50/50 weight percent blends of polyisobutylene with polyethylene-co-1-butene, polyisobutylene with head-to-head polypropylene, and atactic polypropylene with the same polyethylene-co-1-butene samples. The results were used to determine a relationship between miscibility, length scales of mixing, and timescales/length scales of the glass transition.