Balaban, Rosângela de CarvalhoPereira, Bruno Henrique de Albuquerque2018-06-062018-06-062018-01-25PEREIRA, Bruno Henrique de Albuquerque. Desenvolvimento e estudo das propriedades em meio aquoso de derivados termorresponsivos da carboximetilcelulose. 2018. 66f. Dissertação (Mestrado em Química) - Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte, Natal, 2018.https://repositorio.ufrn.br/jspui/handle/123456789/25281The present work studies the synthesis and characterization of two copolymers with thermoresponsive properties, consisting of amino terminated poly (ethylene oxide / propylene oxide) grafts in a carboxymethylcellulose (CMC) backbone. Grafting occurred from a coupling reaction between the –NH2 group of the Jeffamine® M-1000 and M-2070 (commercial nomenclature of polyetheramines) with the COOgroups from CMC, by using 1- ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC) and N-hydroxysuccinimide (NHS) as coupling agents. The structural characterization of the copolymers and their precursors was done by means of IR and 1H NMR spectroscopy. On the IR spectrum of the copolymers it was possible to observe the effectiveness of the grafting reaction due to the presence of the amide group band. In addition, determination of the grafting degree of the Jeffamine chains in the CMC backbone in both copolymers was possible thru the 1H NMR spectrum, it was obtained 9.52% for CMC-g-Jeffamine® M-1000 and 14.14% for CMC-g-Jeffamine® M-2070. The behavior in aqueous medium was studied through visual tests, rheological analysis, Dynamic Light Scattering and UV-vis spectroscopy, the thermo-associative properties of the synthesized copolymers were verified in saline medium. The CMC-g-Jeffamine® M-1000 copolymer exhibited high apparent viscosity values even in a hostile medium, of high ionic strength and high temperature conditions. The CMC-g-Jeffamine® M-2070 copolymer also exhibited the thermoassociative behavior, however its viscosity values are lower than those achieved by CMC-g-Jeffamine® M-1000 copolymer.Acesso AbertoCopolímerosAuto-associaçãoCarboximetilcelulosePoli(óxido de etileno/óxido de propileno)EnxertiamasterThesisCNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA