{"id":56240,"date":"2018-03-09T22:43:54","date_gmt":"2018-03-09T22:43:54","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/contribucion-al-estudio-de-la-degradacion-ambiental-de-poliolefinas-fotoestabilizadas\/"},"modified":"2018-03-09T22:43:54","modified_gmt":"2018-03-09T22:43:54","slug":"contribucion-al-estudio-de-la-degradacion-ambiental-de-poliolefinas-fotoestabilizadas","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/procesos-de-relajacion\/contribucion-al-estudio-de-la-degradacion-ambiental-de-poliolefinas-fotoestabilizadas\/","title":{"rendered":"Contribuci\u00f3n al estudio de la degradaci\u00f3n ambiental de poliolefinas fotoestabilizadas."},"content":{"rendered":"<h2>Tesis doctoral de <strong>  Saenz De Juan o Arbona Victor <\/strong><\/h2>\n<p>El objetivo de esta tesis doctoral es estudiar el proceso de degradaci\u00f3n de films de polietileno para aplicaciones agr\u00edcolas sometidos a periodos de 12, 16, 20, 24 y 31 meses de degradaci\u00f3n ambiental o \u00abweathering\u00bb.  los films fueron preparados por extrusi\u00f3n con polietilenos lineales de baja densidad (lldpe), polietilenos ramificados de baja densidad (ldpe) y mezclas con distintas proporciones de ambos polietilenos lldpe\/ldpe (15\/85, 32\/68, 50\/50, 68\/32 y 85\/15). Todos ellos fueron estabilizados con el hals (aminas est\u00e9ricamente impedidas) chimasorb 119.  a diferencia de lo publicado en otros trabajos, esta tesis plantea analizar las propiedades f\u00edsicas macrosc\u00f3picas de un material polim\u00e9rico en uso, mediante el an\u00e1lisis t\u00e9rmico y relacionar dichas propiedades con el proceso de degradaci\u00f3n ambiental. Las t\u00e9cnicas experimentales b\u00e1sicas que se han considerado en este trabajo son: la termogravimetr\u00eda (tga) combinada con la espectroscop\u00eda de masa (ms), la calorimetr\u00eda diferencial de barrido (dsc) y el an\u00e1lisis termo-mec\u00e1nico-din\u00e1mico (dmta).  a partir de los termogramas termogravim\u00e9tricos se ha estudiado la cin\u00e9tica de termodegradaci\u00f3n de cada film tanto por m\u00e9todos diferenciales como integrales.  los termogramas calorim\u00e9tricos permiten analizar la influencia de la degradaci\u00f3n ambiental sobre la morfolog\u00eda del pol\u00edmero. Se han calculado la temperatura de fusi\u00f3n, los \u00edndices de cristalinidad y distribuci\u00f3n de espesores lamelares. Los ensayos termo-mec\u00e1nicos-din\u00e1micos permiten estudiar las propiedades mec\u00e1nicas de los pol\u00edmeros degradados a partir de su espectro completo de relajaciones mec\u00e1nicas. Estas fueron aisladas mediante el m\u00e9todo de deconvoluci\u00f3n propuesto por charlesworth. Cada una de las relajaciones identificadas se ha caracterizado mediante el modelo de fuoss-kirkwood y se ha calculado su energ\u00eda de activaci\u00f3n. Asimismo, se ha propuesto un origen molecular para cada relajaci\u00f3n.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Contribuci\u00f3n al estudio de la degradaci\u00f3n ambiental de poliolefinas fotoestabilizadas.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Contribuci\u00f3n al estudio de la degradaci\u00f3n ambiental de poliolefinas fotoestabilizadas. <\/li>\n<li><strong>Autor:<\/strong>\u00a0  Saenz De Juan o Arbona Victor <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Polit\u00e9cnica de Valencia<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 18\/12\/2006<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li> Ribes Greus Mar\u00eda Desamparados<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: salvador Montserrat ribas <\/li>\n<li> Lluch rodriguez M\u00aa \u00e1ngeles (vocal)<\/li>\n<li>Jos\u00e9 Mar\u00eda Salla tarrag\u00f3 (vocal)<\/li>\n<li>Mar\u00eda n G\u00f3mez-fatou rodr\u00edguez (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Saenz De Juan o Arbona Victor El objetivo de esta tesis doctoral es estudiar el proceso de [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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