{"id":116419,"date":"2014-02-10T00:00:00","date_gmt":"2014-02-10T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/influencia-de-la-microestructura-en-comportamientos-qua%c2%admicos-y-fa%c2%adsicos-de-pola%c2%admeros-vina%c2%adlicos\/"},"modified":"2014-02-10T00:00:00","modified_gmt":"2014-02-10T00:00:00","slug":"influencia-de-la-microestructura-en-comportamientos-qua%c2%admicos-y-fa%c2%adsicos-de-pola%c2%admeros-vina%c2%adlicos","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/quimica-fisica\/influencia-de-la-microestructura-en-comportamientos-qua%c2%admicos-y-fa%c2%adsicos-de-pola%c2%admeros-vina%c2%adlicos\/","title":{"rendered":"Influencia de la microestructura en comportamientos qu\u00edmicos y f\u00edsicos de pol\u00edmeros vin\u00edlicos."},"content":{"rendered":"<h2>Tesis doctoral de <strong> Jes\u00fas  Miguel Retes Romasanta <\/strong><\/h2>\n<p>Se han preparado una serie de muestras de pvc mediante modificaci\u00f3n qu\u00edmica con tiofenolato s\u00f3dico (nabt) en disoluci\u00f3n de ciclohexanona para obtener diferentes grados de conversi\u00f3n, con el fin de establecer una relaci\u00f3n entre la microestructura y las propiedades del pvc, ya que existen numerosas publicaciones sobre microestructura y propiedades, pero ninguna de ellas une ambos campos. Los grados de modificaci\u00f3n se han obtenido por espectroscopia uv\/vis utilizando una curva de calibrado previamente obtenida en nuestro grupo, y   nmr-13c, obteniendo resultados similares por ambas t\u00e9cnicas. De este modo se han podido obtener diferentes pol\u00edmeros de microestructura perfectamente determinada.\tUna vez obtenidos los pol\u00edmeros se procede a su estudio y al de los pol\u00edmeros de partida (sin modificar): envejecimiento f\u00edsico (dsc: dynamical scanning calorimetry), relajaci\u00f3n \u00edY  (dmta: dynamical mechanical thermal analysis), comportamiento de cargas de espacio (ts: thermal step) y miscibilidad con pmma.\tLos resultados obtenidos por todas las t\u00e9cnicas utilizadas son concomitantes. El envejecimiento f\u00edsico, la relajaci\u00f3n \u00edY, el comportamiento de las cargas de espacio y la miscibilidad dependen enormemente de la miscroestructura-tacticidad del pol\u00edmero, especialmente de las secuencias terminales de las secuencias isot\u00e1cticas. La conformaci\u00f3n gttg-tt unidas a secuencias isotacticas lo suficientemente largas muestran un gran volumen libre y gran capacidad de rotaci\u00f3n, alta movilidad local y nula capacidad de interacciones intramoleculares. Por tanto, la eliminaci\u00f3n de esta estructura durante las primeras etapas de la reacci\u00f3n de  modificaci\u00f3n qu\u00edmica implica cambios en la rigidez, volumen libre, movilidad y capacidad de interacci\u00f3n del pol\u00edmero, lo que afecta enormemente al comportamiento f\u00edsico del pol\u00edmero.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Influencia de la microestructura en comportamientos qu\u00edmicos y f\u00edsicos de pol\u00edmeros vin\u00edlicos.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Influencia de la microestructura en comportamientos qu\u00edmicos y f\u00edsicos de pol\u00edmeros vin\u00edlicos. <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Jes\u00fas  Miguel Retes Romasanta <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Complutense de Madrid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 02\/10\/2014<\/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>Miren Nekane Guarrochena Arlunduaga<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Francisco Ortega gomez <\/li>\n<li>Mar\u00eda  rosario Benavente castro (vocal)<\/li>\n<li>isabel Quijada garrido (vocal)<\/li>\n<li>rodrigo Par\u00eds escribano (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Jes\u00fas Miguel Retes Romasanta Se han preparado una serie de muestras de pvc mediante modificaci\u00f3n qu\u00edmica con [&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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