Browsing by Subject "Polipropilè"
Now showing items 21-40 of 44
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Heat Transfer of Mineral-Filled Polypropylene Foams
(Trans Tech Publications, 2010)
Article
Restricted access - publisher's policyThe thermal conductivity of unfilled polypropylene foams produced using different foaming processes has previously been demonstrated to be mainly affected by the foam’s bulk density [1]. The influence of adding inorganic ... -
Impact properties and water uptake behavior of old newspaper recycled fibers-reinforced polypropylene composites
(Multidisciplinary Digital Publishing Institute (MDPI), 2020-02-28)
Article
Open AccessNatural fiber-reinforced thermoplastic composites can be an alternative to mineral fiber-based composites, especially when economic and environment concerns are included under the material selection criteria. In recent ... -
Influencia del grafeno com nanoaditivo en una matriz de polipropileno
(Universitat Politècnica de Catalunya, 2014-09)
Master thesis
Restricted access - author's decisionA partir de la posibilidad de disponer de grafeno puro, muchos centros de investigación han dedicado grandes esfuerzos a estudiar sus propiedades y desplegar el potencial que parece tener en diversos campos. Las propiedades ... -
Low-temperature plasma treatments in the design of polypropylene surgical meshes for hernia repair
(2016)
Conference report
Restricted access - publisher's policyOne of the new trends in textile biomaterials research is to deliver active compounds locally in the surgical site from the medical device. One way to manage post-operatory infections associated with mesh implants in ... -
Materiales compuestos en base de PP y HDPE reforzados con fibras de cartón reciclado. Comportamiento mecánico
(Universitat Politècnica de Catalunya, 2012-09)
Master thesis
Open AccessLos residuos del cartón ondulado “flutting” constituyen una fuente muy importante de fibras que pueden dar lugar a aplicaciones industriales. Las fibras lignocelulósicas pueden ser aprovechadas, dadas sus características, ... -
Microcellular injection moulding: a comparison between MuCell process and the novel micro-foaming technology IQ Foam
(2019-01-24)
Article
Open AccessThe present work aims to compare two different injection moulding foaming technologies, the already known MuCell® process and the new emerged technology IQ Foam®, as well as the cell structure and mechanical behavior of ... -
Microestructura y propiedades mecánicas de compuestos de polipropileno con hidróxido de magnesio y aluminio moldeados por inyección
(Universitat Politècnica de Catalunya, 2001-07-03)
Doctoral thesis
Open AccessLos hidróxidos de magnesio y de aluminio son unas cargas minerales cuyo uso como carga ignifugante para materiales plásticos, y en particular para polipropileno, es relativamente reciente, aunque en pleno crecimiento debido ... -
Moulded polypropylene foams produced using chemical or physical blowing agents: structure–properties relationship
(2012)
Article
Restricted access - publisher's policyPolypropylene (PP) foams have become essential items due to their excellent properties. Nevertheless, obtaining net-shaped PP foams with medium relative densities is a complicated issue. In this article, two processes ... -
New PHB-producing Bacillus Strain from Environmental Samples
(Nova Science Publishers, Inc, 2015-12-16)
Part of book or chapter of book
Restricted access - publisher's policyMany microorganisms are known to synthesize poly[(R)-3-hydroxybutyrate] (PHB) from renewable resources. This biocompatible and biodegradable biopolyester possesses similar properties to some of the conventional plastics ... -
Optimización del sistema de refrigeración de un molde de inyección para un envase de 17 litros
(Universitat Politècnica de Catalunya, 2010-03)
Master thesis (pre-Bologna period)
Open AccessEl objeto del presente proyecto es incrementar la productividad de un molde de inyección de un envase troncocónico de 17 litros de polipropileno mediante el rediseño y la optimización del sistema de refrigeración empleando ... -
Photochemical nanomodification of polymer surfaces: aerospace applications
(Universitat Politècnica de Catalunya, 2010-09-28)
Master thesis
Open AccessEngineering operations in space require the optimization of a wide variety of procedures and the design of new, lighter and more durable materials. One of the main concerns of human-operated space activities is exposure ... -
Polypropylene-based porous membranes: influence of polymer composition, extrusion draw ratio and uniaxial strain
(2017-12-29)
Article
Open AccessSeveral commercial grades of homo-polymer and its blends were selected to prepare microporous membranes through melt extrusion-annealing-uniaxial stretching technique (MEAUS). Branched or very fluid polypropylene was ... -
Polypropylene/Clay Nanocomposites: Combined effects of clay treatment and compatibilizer polymers on the structure and properties
(Wiley, 2006)
Article
Restricted access - publisher's policyCombined effects of clay treatment and compatibilizer polymers on the structure and properties of polypropylene/clay nanocomposites were studied. Dynamic mechanical analysis was used to analyze comparatively the dynamic ... -
Porous membranes based on polypropylene-ethylene copolymers. Influence of temperature on extrusion, annealing and uniaxial strain stages
(Multidisciplinary Digital Publishing Institute (MDPI), 2018-08-02)
Article
Open AccessIn this study, block and random copolymers of polypropylene–ethylene are selected to prepare porous membranes through the melt extrusion-annealing-uniaxial stretching technique (MEAUS), at a constant draw ratio. In some ... -
Preparación y caracterización de espumas multifuncionales a base de nanocompuestos de poliolefinas
(Universitat Politècnica de Catalunya, 2010-07-23)
Doctoral thesis
Open AccessEn esta tesis doctoral se presenta la preparación y caracterización de espumas rígidas multifuncionales obtenidas a partir de compuestos y nanocompuestos en base polietileno (PE) y polipropileno (PP), indagando en la ... -
Preparation and characterization of cellulosic fibre-reinforced polypropylene foams
(Trans Tech Publications, 2010)
Article
Restricted access - publisher's policyThe preparation and characterization of cellulosic fibre-reinforced polypropylene composite foams is presented. The cellulose fibres were isolated from a barley straw obtained from local sources. They were compounded with ... -
Properties and optimal manufacturing conditions of chicken feathers thermoplastics biocomposites
(2015-01-17)
Article
Open AccessThe aim of this study was the analysis and characterization of composites based on thermoplastics (ethylene vinyl acetate, polypropilene and high-density polyethylene) and chicken feathers. Several composite samples with ... -
Propuesta metodológica para el estudio de viabilidad e idoneidad en el uso de nanocompuestos para piezas plásticas de automoción
(Universitat Politècnica de Catalunya, 2015-12-22)
Doctoral thesis
Open AccessNanotechnology and specially nanomaterials, offer a range of opportunities for the automotive industry. The improvement of physical and chemical properties or the development of new functionalities in the vehicle has driven ... -
Simulació i anàlisi tecnoeconòmica i ambiental de la revalorització de polipropilè residual mitjançant piròlisi
(Universitat Politècnica de Catalunya, 2019-10-14)
Bachelor thesis
Open AccessL’objectiu principal d’aquest treball es donar les primeres passes en el desenvolupament de noves alternatives per la revalorització del polipropilè mitjançant piròlisi a escala industrial. Per fer-ho s’han ... -
Study of the cellular structure heterogeneity and anisotropy of polypropylene and polypropylene nanocomposite foams
(Society of Plastics Engineers, 2009)
Article
Restricted access - publisher's policyThis article presents the analysis of the processing parameters influence on the foaming behavior and cellular structure of PP-montmorillonite foams. Polypropylene nanocomposites containing 5.0 phr of an organically- modified ...
