Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-03-20T20:04:27Z No. of bitstreams: 1 LuanCarvalhoSantanaDeOliveira_DISSERT.pdf: 2245545 bytes, checksum: 12d2d7b903a4e317e9d386eb57ca0374 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-03-22T20:17:43Z (GMT) No. of bitstreams: 1 LuanCarvalhoSantanaDeOliveira_DISSERT.pdf: 2245545 bytes, checksum: 12d2d7b903a4e317e9d386eb57ca0374 (MD5) / Made available in DSpace on 2017-03-22T20:17:43Z (GMT). No. of bitstreams: 1 LuanCarvalhoSantanaDeOliveira_DISSERT.pdf: 2245545 bytes, checksum: 12d2d7b903a4e317e9d386eb57ca0374 (MD5) Previous issue date: 2017-01-20 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / A utiliza??o de res?duos industriais est? em evid?ncia na atualidade, principalmente em fun??o da quest?o ambiental. Nos ?ltimos anos in?meros comp?sitos foram obtidos e estudados, com a utiliza??o de res?duos e fibras vegetais, desmistificando o conceito de que um material s? pode ser chamado de comp?sito se a carga for de refor?o. Obteve e estudou-se um comp?sito de matriz de resina poli?ster (ortoft?lica e tereft?lica) e carga de enchimento de raspa de madeira produzida em marcenarias. Foram estudados os processos de obten??o dos comp?sitos e a caracteriza??o de propriedades mec?nicas, t?rmicas e f?sicas nas amostras dos comp?sitos com fra??o m?ssica de 10, 20 e 30%, para tr?s diferentes granulometrias, totalizando seis formula??es para porcentagens. Por?m, foi escolhida a formula??o com 20%, pois com essa porcentagem j? tinha atingido a satura??o da mistura. Os ensaios realizados foram de tra??o, flex?o, t?rmico, absor??o de ?gua, densidade, biodegrada??o, degrada??o ambiental e MEV. Os comp?sitos obtidos, em todas as formula??es estudadas, apresentaram resist?ncia mec?nica inferior a da matriz, por?m n?o inviabilizou sua utiliza??o para aplica??es onde n?o s?o requeridos significativos esfor?os. Em termos de resist?ncia t?rmica o comp?sito proposto foi competitivo com a resina matriz, tendo comportamento um pouco inferior. Como esperado os comp?sitos apresentaram maiores ?ndices de absor??o de ?gua quando comparados ?s matrizes polim?ricas. A densidade aparente dos comp?sitos n?o apresentou varia??o significativa em rela??o ?s matrizes utilizadas. Demonstrou-se, portanto, que os res?duos agregados ? resina t?m a fun??o de carga de enchimento. O comp?sito foi utilizado para a fabrica??o de tampos de bancos, demonstrando-se sua viabilidade de aplica??o na fabrica??o de estruturas apara baixas solicita??es mec?nicas. / The use of industrial waste is nowadays evident, especially in the environmental issue. In recent years, the results have been obtained with the use of waste and vegetable fibers, the dismemberment of the concept of a material can be called composite. A polyester resin composite (orthophthalic and terephthalic) composite and filler of wood produced in woodworking was obtained and studied. The processes of obtaining composites and a characterization of mechanical, thermal and physical properties in composite samples with a more specific fraction of 10, 20 and 30% were studied for three different granulometries, totaling six formulations for percentages. However, a formulation with 20% was chosen, because with that percentage already had a saturation of the mixture. The tests carried out for tensile, flexural, thermal, water absorption, density, biodegradation, environmental degradation and MEV tests. The composites obtained in all the studied formulations had lower mechanical resistance than the matrix, however it did not make it impossible to use them in applications where no significant efforts are required. In terms of thermal resistance or composite proposed to competitive with a resin matrix, having somewhat lower behavior. As expected the composites presented higher water absorption indices when compared to the polymer matrices. The apparent density of the composites does not present significant variation in relation to the used dimensions. It has been demonstrated, therefore, that the residues aggregated to the resin have a filling charge function. The composite was used for the manufacture of seat tops, demonstrating its feasibility of application in the fabrication of structures for low mechanical stresses.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-08-09T22:54:12Z No. of bitstreams: 1 JoseAntonioMartinsNeto_TESE.pdf: 2915653 bytes, checksum: 3e8f8a24fb45e2bdcd86834ce7b0d770 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-08-12T22:54:51Z (GMT) No. of bitstreams: 1 JoseAntonioMartinsNeto_TESE.pdf: 2915653 bytes, checksum: 3e8f8a24fb45e2bdcd86834ce7b0d770 (MD5) / Made available in DSpace on 2016-08-12T22:54:51Z (GMT). No. of bitstreams: 1 JoseAntonioMartinsNeto_TESE.pdf: 2915653 bytes, checksum: 3e8f8a24fb45e2bdcd86834ce7b0d770 (MD5) Previous issue date: 2016-03-04 / A constante e atual busca de alternativas sustent?veis tem levado a demanda de esfor?os dos pesquisadores na investiga??o e obten??o de novos materiais, motivando a escalada do desenvolvimento produtivo ecologicamente correto e apresentando solu??es simples e pr?tica com rentabilidade econ?mica vi?vel. Neste sentido, a utiliza??o de materiais procedentes de fontes renov?veis naturais, vegetais, apresenta grande potencial de aplicabilidade e s?o vistos como material alternativo para um desenvolvimento sustent?vel. A sustentabilidade questionada, dentre outros quesitos, depende da renov?vel multiplica??o da mat?ria-prima. Como material alternativo as fibras vegetais podem ser aplicadas para produ??o de uma gama de materiais comp?sitos amenizando o uso de materiais oriundos de fontes n?o renov?veis Nesta tese foram utilizadas mantas de sisal para obten??o de um comp?sito tendo como matriz uma resina poli?ster ortoft?lica. As mantas foram submetidas a tratamento superficial, em ?gua fervente, por 15 minutos. As mantas de fibras de sisal utilizadas tinham, respectivamente, 5%, 10% e 15% da massa do comp?sito. O comp?sito foi obtido e caracterizado mec?nica e termicamente para as formula??es escolhidas. Foram fabricadas v?rias placas do comp?sito para obten??o dos corpos de provas para os ensaios de caracteriza??o obedecendo ?s normas pertinentes. Os comp?sitos obtidos apresentaram resist?ncia mec?nica de tra??o e flex?o inferiores ? da matriz, sendo vi?vel sua utiliza??o onde s?o requeridas baixas solicita??es de carga. O resultado mais expressivo do comp?sito estudado deu-se para a absor??o de energia de impacto, muito superior a da matriz utilizada. Outras propriedades de destaque foram a absor??o em ?leo e a densidade. Provou-se a viabilidade de obten??o do comp?sito para as tr?s formula??es estudadas C5, C10 e C15, cuja mais vi?vel foi a C10. Para demonstrar a viabilidade de utiliza??o do comp?sito foram fabricados um rel?gio de parede, um banco, uma cadeira e uma prateleira, estruturas de baixas solicita??es mec?nicas. Concluiu-se que as mantas de sisal exerceram a fun??o de carga no comp?sito. / The constant search for sustainable alternatives has earned great effort of researchers in research and obtaining new materials, encouraging the rise of eco-friendly productive development and providing simple and practical solutions to economic profitability. In this sense, the use of materials derived from natural renewable sources, vegetables, has great potential applicability to sustainable development. As alternative materials plant fibers can be applied to production of a range of composite materials easing the use of materials derived from non-renewable this thesis were sisal mats used for achieving a composite matrix having as one orthophthalic polyester resin. The webs were subjected to surface treatment in boiling water for 15 minutes. The webs of sisal fibers used were, respectively, 5%, 10% and 15% of the composite weight. The composite was obtained and characterized mechanically and thermally to the chosen formulations. several plates of the composite to obtain the body of evidence for the characterization tests complying with the relevant rules were made. The obtained composites showed strength tensile and bending lower than the array, so it can be used where are required low load requests. The most significant result of the composite studied given to the impact energy absorption, far superior to the matrix used. Other properties were highlighted in oil absorption, and density. It proved the feasibility of obtaining the composite for the three formulations studied C5, C10 and C15 being the most feasible to C10. To demonstrate the feasibility of using composite were made a wall clock, a bench, a chair and a shelf, low mechanical stress structures. It was concluded that the sisal rugs exercised the load function in the composite.

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.