Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2018-01-23T14:20:40Z No. of bitstreams: 1 ZulmarJofliDosSantosJunior_TESE.pdf: 3964236 bytes, checksum: 3b3bfc71a2c718ffc333877fed25c592 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2018-01-25T11:00:02Z (GMT) No. of bitstreams: 1 ZulmarJofliDosSantosJunior_TESE.pdf: 3964236 bytes, checksum: 3b3bfc71a2c718ffc333877fed25c592 (MD5) / Made available in DSpace on 2018-01-25T11:00:03Z (GMT). No. of bitstreams: 1 ZulmarJofliDosSantosJunior_TESE.pdf: 3964236 bytes, checksum: 3b3bfc71a2c718ffc333877fed25c592 (MD5) Previous issue date: 2017-08-31 / As quest?es ambientais v?m provocando discuss?es entre v?rios atores sociais compostos por grupos de ativistas, ambientalistas, pol?ticos, cientistas, pesquisadores, discentes, institui??es p?blicas e privadas. Dentro deste universo o presente trabalho prop?ese a obter e caracterizar um comp?sito de matriz de resina Poli?ster Ortoft?lica com carga de refor?o/ enchimento de fibra vegetal da esp?cie Agave Angustifolia Haw na propor??o de 5%, 7,5% e 10% em massa em rela??o ? matriz. Foram fabricadas mantas de fibra da agave para tr?s formula??es e, para a obten??o do comp?sito, utilizou-se o processo de prensagem a frio. As mantas de agave, intercaladas com a resina, foram colocadas no molde com orienta??es defasadas de 90? entre as mesmas e pesando 5g cada. Os corpos de prova das formula??es dos comp?sitos foram fabricados em molde fechado, baseados em normas espec?ficas e foram submetidos a ciclos de ensaios mec?nicos, t?rmicos, f?sicos e qu?micos. Sendo determinadas as resist?ncias mec?nicas a tra??o, flex?o, impacto, propriedades termof?sicas, a densidade, a absor??o de ?gua doce e salgada, e a composi??o qu?mica atrav?s da Espectrometria de Fluoresc?ncia de Raios X (FRX). Provou-se a viabilidade de obten??o do comp?sito para todas as formula??es estudadas. A formula??o mecanicamente mais vi?vel foi a de 10% de fibra de Agave Angustifolia Haw. Todas as formula??es apresentaram resist?ncias mec?nicas ? tra??o e ao impacto superiores ? da resina matriz, traduzindo uma fun??o de carga de refor?o da fibra de Agave utilizada. As fibras comportaram-se como carga de enchimento quando todas as suas formula??es apresentaram resist?ncias mec?nicas a flex?o inferior ? da resina matriz. / Environmental issues have raised discussions among several social agents such as activists, ambietalists, politicians, scientists, professors and both private and public institutions. Within this scope, this paper aims to develop and carachterize an Orthophthalic Polyester resin matrix composite with reinforcing / filling load of vegetable fiber of the species Agave Angustifolia Haw in the proportion of 5%, 7.5% and 10% in mass comparing to the matrix. Agave fiber blankets were made for three formulations and, to obtain the composite, the cold pressing process was used. The agave blankets, intercalated with the resin, were placed in the template with 90? lagged orientations between them and weighing 5g each. The test specimens of the composite formulations were fabricated in a closed mould, based on specific standards and subjected to mechanical, thermal, physical and chemical test cycles. The tensile strength, flexural strength, impact, thermophysical properties, density, freshwater and saltwater absorption, and chemical composition are determined by X-Ray Fluorescence Spectrometry (FRX). The feasibility of obtaining the composite was tested for all formulations studied. The mechanically most viable formulation was the one composed by 10% Agave Angustifolia Haw fiber. All the formulations had higher tensile and impact strength than the matrix resin, leading to a reinforcing load function of the Agave fiber used. The fibers behaved as fillers when all of their formulations presented mechanical strength at lower flexion than the matrix resin.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-08-01T12:12:38Z No. of bitstreams: 1 LarissaCarolineFernandesCosta_DISSERT.pdf: 2007912 bytes, checksum: 69954dca07d2068ae02c52bd9db08760 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-08-03T20:10:46Z (GMT) No. of bitstreams: 1 LarissaCarolineFernandesCosta_DISSERT.pdf: 2007912 bytes, checksum: 69954dca07d2068ae02c52bd9db08760 (MD5) / Made available in DSpace on 2017-08-03T20:10:46Z (GMT). No. of bitstreams: 1 LarissaCarolineFernandesCosta_DISSERT.pdf: 2007912 bytes, checksum: 69954dca07d2068ae02c52bd9db08760 (MD5) Previous issue date: 2017-04-07 / Apresenta-se um comp?sito formado por resina poli?ster e carga de res?duos de p? de m?rmore (RPM) produzidos pelo corte de pedras ornamentais. O res?duo produzido foi processado para a obten??o de p?s. V?rias formula??es do comp?sito foram testadas, variando-se o percentual de carga em rela??o ?s reninas de poli?ster, cristal ou escura. Todas as formula??es escolhidas, 50% RPM, 100% RPM, 150% RPM, 200% RPM e 250% RPM apresentaram viabilidade de processamento e obten??o do comp?sito. O p? de m?rmore e os comp?sitos produzidos foram caracterizados para a determina??o de propriedades f?sicas, mec?nicas e t?rmicas. Os resultados da caracteriza??o das formula??es do comp?sito mostraram que o p? de m?rmore esteve presente no comp?sito como carga de enchimento. A propriedade em que o comp?sito apresentou melhor resultado que a resina matriz foi ? resist?ncia ao impacto. Analisando-se a processabilidade, todas as formula??es do comp?sito apresentaram-se vi?veis, para as duas resinas estudadas. O comp?sito demonstrou-se vi?vel para a fabrica??o de mesas, cadeiras, pranchas, obras de arte, pe?as para banheiros, divis?rias para ambientes, estruturas que n?o requerem resist?ncia ? grandes esfor?os. Uma importante vantagem do comp?sito estudado ? a diminui??o da quantidade de resina a ser utilizada, uma vez que a carga de p? de res?duo pode alcan?ar 250% em rela??o ? matriz, diminuindo-se o custo do material obtido para a fabrica??o de estruturas diversas. O comp?sito polim?rico mostrou-se vi?vel para substituir pedras de m?rmore e granito naturais. / It presents a composite formed by polyester resin and load of marble dust residues (RPM) produced by the cut of ornamental stones. The residue produced was processed to obtain powders. Several composite formulations were tested by varying the load percentage relative to polyester, crystal or dark renin. All formulations chosen, 50% RPM, 100% RPM, 150% RPM, 200% RPM and 250% RPM presented feasibility of processing and obtaining the composite. The marble powder and composites produced were characterized for the determination of physical, mechanical and thermal properties. The results of the characterization of the composite formulations showed that the marble powder was present in the composite as a filler. The property in which the composite presented better results than the matrix resin was the impact strength. Analyzing the processability all the formulations of the composite were feasible, for the two resins studied. The composite has proven to be feasible for the manufacture of tables, chairs, planks, works of art, parts for bathrooms, partitions for environments, structures that do not require resistance to great efforts. An important advantage of the composite studied is the decrease in the amount of resin to be used, since the residue powder load can reach 250% in relation to the matrix, reducing the cost of the material obtained for the manufacture of various structures. The polymer composite proved to be feasible to replace natural marble and granite stones.