{"id":36100,"date":"1998-01-01T00:00:00","date_gmt":"1998-01-01T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/caracterizacion-viscoelastica-y-comportamiento-reologico-de-polimeros-termotropicos-en-fase-nematica\/"},"modified":"1998-01-01T00:00:00","modified_gmt":"1998-01-01T00:00:00","slug":"caracterizacion-viscoelastica-y-comportamiento-reologico-de-polimeros-termotropicos-en-fase-nematica","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/quimica\/caracterizacion-viscoelastica-y-comportamiento-reologico-de-polimeros-termotropicos-en-fase-nematica\/","title":{"rendered":"Caracterizacion viscoelastica y comportamiento reologico de polimeros termotropicos en fase nematica."},"content":{"rendered":"<h2>Tesis doctoral de <strong> Marta Tormes Alberdi <\/strong><\/h2>\n<p>En el presente trabajo se realiza la caracterizaci\u00f3n viscoel\u00e1stica de dos copoli\u00e9steres comerciales, el rodrun 3000 y rodrun 5000. As\u00ed mismo se caracterizan dos copoli\u00e9steramidas no comerciales denominadas gen\u00e9ricamente pei 1f y pei 2e, cuyo inter\u00e9s estriba en el car\u00e1cter anis\u00f3tropo que presenta la primera frente al comportamiento is\u00f3tropo de la segunda, diferenciandose \u00fanicamente en la uni\u00f3n del grupo \u00e9ster al anillo imida.  por otro lado, el estudio reol\u00f3gico de las propiedades viscoel\u00e1sticas de los dos copoli\u00e9steres comerciales nos permite observar las respuestas caracter\u00edsticas de los pol\u00edmeros termotr\u00f3picos a ensayos oscilatorios, flujos continuos y ensayos transitorios. As\u00ed se obtiene una curva de flujo con tres zonas diferenciadas para el rodrun 3000 mientras que el rodrun 5000 presenta una fluidificaci\u00f3n continua. Como respuesta a ensayos transitorios de inicio de un flujo en cizalla, ambos pol\u00edmeros muestran dos picos antes de alcanzar el estado estacionario provocados por la estructura de polidominios caracter\u00edstica de estos sistemas.  el estudio del flujo en extrusi\u00f3n nos permite establecer una relaci\u00f3n entre el aumento de viscosidad que se produce a lo largo del capilar o rendija, originado como consecuencia de la competencia que se produce entre los r\u00e9gimenes de basculaci\u00f3n y alineamiento del vector director y el tiempo de residencia del material en dichas geometr\u00edas. Este aspecto es importante ya que el aumento de la viscosidad observado puede derivar en el empobrecimiento de una de las mejores propiedades de estos materiales: su f\u00e1cil procesabilidad.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Caracterizacion viscoelastica y comportamiento reologico de polimeros termotropicos en fase nematica.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Caracterizacion viscoelastica y comportamiento reologico de polimeros termotropicos en fase nematica. <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Marta Tormes Alberdi <\/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 01\/01\/1998<\/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>Pedro Antonio Santamar\u00eda Ibarburu<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Jos\u00e9 Manuel Pere\u00f1a Conde <\/li>\n<li>Mar\u00eda  Eugenia Mu\u00f1oz Bergareche (vocal)<\/li>\n<li> Nazabal Etxeberria Juan  Luis (vocal)<\/li>\n<li>Jos\u00e9 Mu\u00f1oz Garcia (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Marta Tormes Alberdi En el presente trabajo se realiza la caracterizaci\u00f3n viscoel\u00e1stica de dos copoli\u00e9steres comerciales, el [&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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