{"id":116682,"date":"2018-03-11T10:45:57","date_gmt":"2018-03-11T10:45:57","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/cyclic-derivatives-of-d-glucose-and-tartaric-acid-as-building-blocks-for-renewable-polyesters\/"},"modified":"2018-03-11T10:45:57","modified_gmt":"2018-03-11T10:45:57","slug":"cyclic-derivatives-of-d-glucose-and-tartaric-acid-as-building-blocks-for-renewable-polyesters","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/quimica-macromolecular\/cyclic-derivatives-of-d-glucose-and-tartaric-acid-as-building-blocks-for-renewable-polyesters\/","title":{"rendered":"Cyclic derivatives of d-glucose and tartaric acid as building blocks for renewable polyesters"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Cristina Japu <\/strong><\/h2>\n<p>En esta tesis se han sintetizado mediante reacci\u00f3n de policondensaci\u00f3n en masa tres series de copoliesteres arom\u00e1ticos derivados del poli(etilen tereftalato) (pet), poli(butilen tereftalato) (pbt) y poli(hexametilen tereftalato) (pht) en los que se han sustituido parcial o totalmente las unidades tereftalicas o las unidades oxialquil\u00e9nicas por di\u00e1cidos y dioles c\u00edclicos y bic\u00edclicos obtenidos por derivatizaci\u00f3n de mon\u00f3meros de origen natural como son el \u00e1cido tart\u00e1rico y la d-glucosa. Tambi\u00e9n se han sintetizado mediante policondensaci\u00f3n en masa y en disoluci\u00f3n por v\u00eda enzim\u00e1tica una serie de copoliesteres alif\u00e1ticos derivados del poli(butilen sebacato) en los que las unidades oxibutil\u00e9nicas y seb\u00e1cicas se han reemplazado por dioles y di\u00e1cidos bic\u00edclicos derivados de la d-glucosa. Todas las series se han caracterizado espectrosc\u00f3picamente mediante ftir y rmn en disoluci\u00f3n. Mediante rmn de 1h se ha determinado la composici\u00f3n de los copol\u00edmeros. Por otro lado mediante rmn de 13c se ha estudiado la microestructura de los mismos. Dicho estudio revel\u00f3 que todos los copol\u00edmeros eran al azar. Los pesos moleculares determinados mediante cromatograf\u00eda de permeabilidad en gel y viscosimetr\u00eda capilar  resultaron ser aceptables, aunque en todos los casos disminu\u00edan a medida que aumentaba el contenido del mon\u00f3mero de origen renovable. Las propiedades t\u00e9rmicas se han evaluado mediante calorimetr\u00eda diferencial de barrido (dsc) y an\u00e1lisis termogravim\u00e9trico. Se ha observado que la estabilidad t\u00e9rmica no se ve apenas afectada cuando la sustituci\u00f3n se realiza sobre la unidad oxialquil\u00e9nica y que por otro lado desciende cuando es la unidad tereft\u00e1lica la sustituida. Los nuevos copol\u00edmeros presentaron temperaturas de transici\u00f3n v\u00edtrea superiores, observ\u00e1ndose que este aumento era superior  en los copol\u00edmeros que incorporaban el diol o el di\u00e1cido bic\u00edclico derivado de la d-glucosa que en los que incorporaban  el diol o el di\u00e1cido monociclico derivado del \u00e1cido tart\u00e1rico. Los copolimeros eran por lo general menos cristalinos, menos cristalizables y con temperaturas de fusi\u00f3n inferiores. La estructura cristalina de los mismos determinada mediante difracci\u00f3n de rayos-x era semejante a la de los homopolimeros pet, pbt y pht. Se ha estudiado la degradabilidad hidrolitica y la biodegradabilidad de todos ellos mediante medidas de p\u00e9rdida de peso, pesos moleculares, microscop\u00eda electr\u00f3nica de barrido (sem), observ\u00e1ndose un aumento de ambas propiedades para los nuevos copol\u00edmeros.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Cyclic derivatives of d-glucose and tartaric acid as building blocks for renewable polyesters<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Cyclic derivatives of d-glucose and tartaric acid as building blocks for renewable polyesters <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Cristina Japu <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Polit\u00e9cnica de catalunya<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 21\/11\/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>Antx\u00f3n Mart\u00ednez De Ilarduya S\u00e1ez De Asteasu<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: virginia C\u00e1diz deleito <\/li>\n<li>Jos\u00e9 Alberto M\u00e9ndez gonz\u00e1lez (vocal)<\/li>\n<li>katja Loos (vocal)<\/li>\n<li>tzanko Tzanov (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Cristina Japu En esta tesis se han sintetizado mediante reacci\u00f3n de policondensaci\u00f3n en masa tres series 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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