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Author: José Ignacio Velasco Perero
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Languages : ca
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Author: José Ignacio Velasco Perero
Publisher:
ISBN:
Category :
Languages : ca
Pages :
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Book Description
Author: José Ignacio Velasco Perero
Publisher:
ISBN: 9788469256329
Category :
Languages : es
Pages :
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Languages : es
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RESUMEN La investigación realizada en esta tesis se ha centrado en la caracterización de la fractura de materiales compuestos por una matriz de polipropileno homopolímero isotáctico y diferentes fracciones de partículas laminares de talco. Estos materiales se emplean en la actualidad para la fabricación de piezas por inyección, especialmente en el sector de automoción. Por extrusión de doble tornillo se prepararon dos series de materiales conteniendo diferentes fracciones de talco disperso, el cual fue previamente tratado con agentes de acoplamiento de tipo silano organofuncional para inducir adhesión en la interfase. Se preparó una serie equivalente con talco sin tratar con fines comparativos. Las probetas para los ensayos se obtuvieron mediante moldeo por inyección. Además de caracterizar térmica y mecánicamente dichos materiales, se ha estudiado la influencia del porcentaje de partículas, del grado de adhesión en la interfase, y de la velocidad de solicitación, sobre los valores de la tenacidad y energía de fractura, y se han identificado los micromecanismos responsables de su deformación y fractura. Los resultados obtenidos se discuten asimismo sobre la base de las características morfológicas y microestructurales observadas. ------------------------------------ ABSTRACT The investigation was focused on the characterization of the fracture of plastic materials made up of isotactic polypropylene (homopolymer) containing different fractions of lamellar talc particles. Because of their rigidity and low cost, these materials are used at the present time for the manufacture of injection-molding parts, especially for the automobile sector. Different fractions of talc were dispersed into the polypropylene matrix by using a co-rotating twin-screw extruder. Two series of composites were prepared with different fractions of both untreated and silane-treated talc. The surface treatment of the talc with organofunctional silane was previously performed in order to promote be.
Author: José Ignacio Velasco Perero
Publisher:
ISBN:
Category :
Languages : es
Pages : 0
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Author: Vera V. Myasoedova
Publisher: John Wiley & Sons
ISBN: 3527837019
Category : Technology & Engineering
Languages : en
Pages : 1162
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Book Description
Comprehensive knowledge on the preparation, characterization, and applications of polymer nanocomposites Chemical Physics of Polymer Nanocomposites examines the state of the art in preparation, processing, characterizing, and applying a wide range of polymer nanocomposites, elucidating nanofiller/polymer interactions, nanofiller dispersion, distribution, filler-filler interactions, and interface properties, with a particular focus on the rheology of this important class of materials. The dependence of the rheological properties on the preparation techniques is discussed in detail, complemented by an overview of the processing approaches using conventional and micro injection molding, extrusion, compression molding, film blowing, pultrusion, and resin transfer molding. The book covers the latest understanding and accomplishments on polymer composites and presents the huge variety of this materials class. Practice-oriented with industry relevance, it also reviews preparation, characterization, morphology, properties, applications, sustainability, and recyclability. The topics covered in Chemical Physics of Polymer Nanocomposites include: Classification of nano fillers, nano-objects, nanomaterials, and polymer nanocomposites based on chemical nature and identity, and synthesis and characterization of nanoparticles General manufacturing methods and processes, including melt and shear mixing manufacturing of polymer nanocomposites 1D nano fillers and polymer nanocomposites, including polymer nanocomposites based on graphite nanoplatelets (GNP) and amphiphilic graphene platelets Polymer nanocomposites based on nano chitin, starch, and lignin, gold nanowires, titanium dioxide, and graphene and graphene oxide Chemical Physics of Polymer Nanocomposites is an essential resource for materials scientists, polymer chemists, chemical engineers, and engineering scientists in industry.
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Languages : es
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Se han estudiado las propiedades y caracteristicas de comportamiento mecanico de los materiales compuestos ("composites") constituidos por una matriz termoplastica, el polipropileno, y un refuerzo mineral, talco. En primer lugar se ha procedido a la eleccion de ambos constituyentes de entre los distintos grados y variedades existentes en el mercado industrial. Se ha procedido a continuacion a la caracterizacion microestructural de ambos componentes ya en el material compuesto, correlacionado el comportamiento mecanico del sistema polipropileno/talco con las caracteristicas intrinsecas de ambos, y a su traves con la interfase entre componentes en el material compuesto como principal responsable del comportamiento mecanico y posibilidades de utilizacion tecnologica del mismo. En este sentido se ha determinado la fraccion optima de matriz ...
Author: Ewa Piorkowska
Publisher: John Wiley & Sons
ISBN: 0470380233
Category : Technology & Engineering
Languages : en
Pages : 514
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Book Description
Polymeric crystals are more complex in nature than other materials' crystal structures due to significant structural disorder present. The only comprehensive reference on polymer crystallization, Handbook of Polymer Crystallization provides readers with a broad, in-depth guide on the subject, covering the numerous problems encountered during crystallization as well as solutions to resolve those problems to achieve the desired result. Edited by leading authorities in the field, topics explored include neat polymers, heterogeneous systems, polymer blends, polymer composites orientation induced crystallization, crystallization in nanocomposites, and crystallization in complex thermal processing conditions.
Author: D. R. Houghton
Publisher: Springer Science & Business Media
ISBN: 940091363X
Category : Science
Languages : en
Pages : 865
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Book Description
Because of the magnificent response to the call for papers for the 7th International Biodeterioration Symposium held at Cambridge, UK, some difficulties have been experienced in the editing of these proceedings. The numbers of papers submitted exceeded expectation and because of this it has been necessary to accommodate those not actually in the proceedings into the International Biodeterioration journal. A small number of papers were not suitable for publication and were therefore eliminated. Many authors disregarded the guidelines laid down for the length of submitted papers. However, every attempt has been made to accommodate the maximum number of contributions in the proceedings. The original selection included those which most nearly conformed to the length requirement. Even so this has meant, in many cases, cutting down the text, eliminating tables and/or illustrations and pruning the reference list. When references have been trimmed a note has been included to the effect that an extended list may be obtained from the author/senior author. Where it was not possible to carry out these procedures without seriously altering the text and the import of the paper they have been included amongst those to be published in the journal International Biodeterioration. The exceptions to the procedures outlined above are the invited review papers which have been presented in full. Happily, the authors have been conscientious in keeping to the guidelines laid down for these contributions.
Author: Rayner M. Mayer
Publisher:
ISBN: 9780852989579
Category : Blades
Languages : en
Pages : 246
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Author: Samuel Kenig
Publisher: Carl Hanser Verlag GmbH Co KG
ISBN: 156990636X
Category : Technology & Engineering
Languages : en
Pages : 531
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Book Description
This book covers the fundamental unit operations involved in processing of thermoplastic and thermoset nanocomposites. The processing methods include extrusion, injection molding, blow molding, and thermoforming. Also covered are nanoparticle dispersion, distribution, and compatibilization, and applications of polymer nanocomposites. Nanocomposites have been of high research interest in the past decades and a number of practical applications are now emerging, such as in the automotive sector. Although there have been previous works on nanocomposites, they are not as current as this one and they do not have the emphasis on processing found here. Edited and written by leading experts in the field, this book is a major contribution to a growing and exciting area of research.
