{"id":72014,"date":"2018-03-09T23:16:46","date_gmt":"2018-03-09T23:16:46","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/dinamica-de-anillos-fenileno-y-relajacion-secundaria-en-termoplasticos-de-ingenieria-estudio-mediante-tecnicas-de-neutrones\/"},"modified":"2018-03-09T23:16:46","modified_gmt":"2018-03-09T23:16:46","slug":"dinamica-de-anillos-fenileno-y-relajacion-secundaria-en-termoplasticos-de-ingenieria-estudio-mediante-tecnicas-de-neutrones","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/quimica\/dinamica-de-anillos-fenileno-y-relajacion-secundaria-en-termoplasticos-de-ingenieria-estudio-mediante-tecnicas-de-neutrones\/","title":{"rendered":"Dinamica de anillos fenileno y relajacion secundaria en termoplasticos de ingenieria. estudio mediante tecnicas de neutrones"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Silvia Arrese-igor Irigoyen <\/strong><\/h2>\n<p>El trabajo de tesis comprende el estudio exhaustivo de la din\u00e1mica de los anillos fenileno por debajo de la temperatura de transici\u00f3n v\u00edtrea en una serie de termopl\u00e1sticos de ingenier\u00eda derivados del grupo bisfenol-a 8bpa) mediante t\u00e9cnicas de neutrones. La deuteraci\u00f3n selectiva de las muestras y el uso de diferentes tipos de espectr\u00f3metros (tiempo de vuelo y backscattering) permite aislar la din\u00e1mica de grupos concretos dentro de la mol\u00e9cula, y cubrir un amplio intervalo de tiempo. De esta manera se responde a una doble motivaci\u00f3n, la del conocimiento b\u00e1sico de los movimientos moleculares en sistemas formadores de vidrios, y la del inter\u00e9s tecnol\u00f3gico que supone conocer en \u00faltima instancia los factores que condicionan las propiedades macrosc\u00f3picas de los pol\u00edmeros, ya que \u00e9stas est\u00e1n directa o indirectamente relacionadas con los procesos din\u00e1micos que ocurren a escala molecular.  las macromol\u00e9culas de las diferentes muestras utilizadas est\u00e1n formadas en cada caso por la repetici\u00f3n de unidades bpa unidas por grupos espaciadores m\u00e1s o menos grandes y flexibles. Adem\u00e1s de la caracterizaci\u00f3n din\u00e1mica y geom\u00e9trica del movimiento de los anillos fenileno en las unidades bpa, se analiza la influencia del grupo espaciador y de las interacciones intra e intermoleculares en dicho movimiento, as\u00ed como la relaci\u00f3n de todo lo anterior con el origen molecular de la relajaci\u00f3n secundaria observada mediante t\u00e9cnicas espectrosc\u00f3picas en estos materiales.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Dinamica de anillos fenileno y relajacion secundaria en termoplasticos de ingenieria. estudio mediante tecnicas de neutrones<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Dinamica de anillos fenileno y relajacion secundaria en termoplasticos de ingenieria. estudio mediante tecnicas de neutrones <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Silvia Arrese-igor Irigoyen <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Pa\u00eds vasco\/euskal herriko unibertsitatea<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 17\/12\/2004<\/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>Angel Alegria Loinaz<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: bernhard Frick <\/li>\n<li>tiberio Antonio Ezquerra sanz (vocal)<\/li>\n<li>carmen Mijangos ugarte (vocal)<\/li>\n<li>angel Jos\u00e9 Moreno segurado (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Silvia Arrese-igor Irigoyen El trabajo de tesis comprende el estudio exhaustivo de la din\u00e1mica de los anillos [&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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