{"id":71285,"date":"2018-03-09T23:15:55","date_gmt":"2018-03-09T23:15:55","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/estudio-de-la-degradacion-de-los-pola%c2%admeros-commodities-en-el-medio-ambiente\/"},"modified":"2018-03-09T23:15:55","modified_gmt":"2018-03-09T23:15:55","slug":"estudio-de-la-degradacion-de-los-pola%c2%admeros-commodities-en-el-medio-ambiente","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/quimica\/estudio-de-la-degradacion-de-los-pola%c2%admeros-commodities-en-el-medio-ambiente\/","title":{"rendered":"Estudio de la degradaci\u00f3n de los pol\u00edmeros commodities en el medio ambiente"},"content":{"rendered":"<h2>Tesis doctoral de <strong>  Coul\u00f3n Grisa Ana Mar\u00eda <\/strong><\/h2>\n<p>En este trabajo se estudiaron las condiciones bi\u00f3ticas de relleno sanitario de sao giacomo de caxias do sul, rs, brasil, mediante an\u00e1lisis multivariante de 14 par\u00e1metros f\u00edsico-qu\u00edmicos del lixiviado producido en las c\u00e9lulas de relleno a lo largo del tiempo, observando la degradaci\u00f3n\/biodegadaci\u00f3n de pol\u00edmeros \u00abcommodities\u00bb del relleno. La elecci\u00f3n de polietileno de baja densidad (pebd), polietileno de alta densidad (pead), polipropileno (pp) y policlorato de vinilo (pvc), se bas\u00f3 en la abundancia de los polienos en los residuos s\u00f3lidos depositados. Se realizaron determinaciones termogravim\u00e9tricas, estructurales y morfol\u00f3gicas de estos materiales degradados en dicho ecosistema. considerando la estabilizaci\u00f3n microbiol\u00f3gica y el relleno en fase de maduraci\u00f3n final, los pol\u00edmeros commodities estudiados presentaron degradaci\u00f3n oxidativa, por mecanismos de peroxidaci\u00f3n y transferencia en cadena. Se caracterizaron e identificaron las modificaciones termogravim\u00e9tricas (tg y dtg) y estructurales por espectroscopia de ft-ir, y las morfol\u00f3gicas de con el meb. Se atribuy\u00f3 la mayor degradaci\u00f3n al pebd, pues a partir de tres a\u00f1os de enterramiento hubo escisi\u00f3n de cadena al azar y reticulaciones (degradaci\u00f3n tipo norrish i y ii); mientras que, el pead present\u00f3 un aumento de la cristalizaci\u00f3n en la degradaci\u00f3n (2ea) v\u00eda peroxidaci\u00f3n abi\u00f3rica con reticulaci\u00f3n de cadena. las pel\u00edculas de pp biodegradados se presentan escamadas y con sifuras en la superficie oxidada y al azar.  la mayor actividad microbiana fue analizada sobre las pel\u00edculas de ps, con colonias superficiales, formaci\u00f3n de olig\u00f3meros y cambios de tacticidad. en las pel\u00edculas de pvc se detect\u00f3 una exudaci\u00f3n de los aditivos del pol\u00edmero comercial, mostrando el inicio de mecanismod de degradaci\u00f3n\/biodegradaci\u00f3n, seguidos de la p\u00e9rdida de hcl y de la erosi\u00f3n bi\u00f3tica del material.  palabras clave: an\u00e1lisis de componentes principales, pol\u00edmeros comm<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Estudio de la degradaci\u00f3n de los pol\u00edmeros commodities en el medio ambiente<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Estudio de la degradaci\u00f3n de los pol\u00edmeros commodities en el medio ambiente <\/li>\n<li><strong>Autor:<\/strong>\u00a0  Coul\u00f3n Grisa Ana Mar\u00eda <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Le\u00f3n<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 18\/11\/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>Zeni Andrade Mara<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal:  Luengo rodr\u00edguez Jos\u00e9 M\u00aa <\/li>\n<li> Garc\u00eda p\u00e9rez Jos\u00e9 Miguel (vocal)<\/li>\n<li> Garc\u00eda mart\u00ednez Jes\u00fas M\u00aa (vocal)<\/li>\n<li> Del pino guti\u00e9rrez Javier (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Coul\u00f3n Grisa Ana Mar\u00eda En este trabajo se estudiaron las condiciones bi\u00f3ticas de relleno sanitario de sao [&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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