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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Obten??o e caracteriza??o de um comp?sito polim?rico de matriz poli?ster e refor?o/carga de tecido plano de algod?o

Marques, Marcelo de Souza 23 February 2016 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-20T22:04:58Z No. of bitstreams: 1 MarceloDeSouzaMarques_TESE.pdf: 37145342 bytes, checksum: eb13cda95cd905ff751d5965bb02d4ae (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-07-21T21:20:45Z (GMT) No. of bitstreams: 1 MarceloDeSouzaMarques_TESE.pdf: 37145342 bytes, checksum: eb13cda95cd905ff751d5965bb02d4ae (MD5) / Made available in DSpace on 2016-07-21T21:20:45Z (GMT). No. of bitstreams: 1 MarceloDeSouzaMarques_TESE.pdf: 37145342 bytes, checksum: eb13cda95cd905ff751d5965bb02d4ae (MD5) Previous issue date: 2016-02-23 / Obteve-se e estudou-se a viabilidade do uso de TPA ( Tecido Plano de Algod?o) tipo tela, para ensacamento, com gramatura de 216,8 g/cm2 em um comp?sito de matriz de resina poli?ster ortoft?lica cristal. O processo de obten??o do comp?sito foi testado em rela??o ao n?mero m?ximo de camadas que poderia ser utilizado, sem comprometer a sua processabilidade e a fabrica??o dos CPs em molde compressivo. Foram escolhidas e testadas cinco configura??es/formula??es, com 1, 4, 8, 10 e 12 camadas de tecido plano de algod?o - TPA. O TPA n?o foi submetido a tratamento qu?mico, passando apenas por um processo de lavagem mec?nica. O comp?sito em suas v?rias configura??es/formula??es foi caracterizado para a determina??o de suas principais propriedades f?sicas. As propriedades de maior viabilidade do comp?sito foram a resist?ncia a flex?o, aproximando-se da matriz e a resist?ncia ao impacto, com superioridade em rela??o a resina de poli?ster. Outra propriedade que demonstrou bom resultado em rela??o a outros comp?sitos foi a absor??o de ?gua. Analisando-se todas as propriedades determinadas as configura??es/formula??es com maior viabilidade foram a TA8 e TA10, por combinarem boa processabilidade e resist?ncia mec?nica mais elevada, com menor perda em rela??o a resina poli?ster matriz. O comp?sito apresentou comportamento mec?nico inferior ao da resina matriz para todas as formula??es estudadas, com exce??o da resist?ncia ao impacto. O MEV evidenciou uma boa ades?o entre as camadas de TPA e a resina poli?ster matriz, sem a presen?a de micro vazios na matriz confirmando o eficiente processo de fabrica??o dos corpos de prova para caracteriza??o. O comp?sito proposto apresentou viabilidade para a fabrica??o de estruturas com baixas solicita??es de esfor?os mec?nicos, e como foi demonstrado para a fabrica??o de prot?tipos solares. / He was obtained and studied the feasibility of using TPA (Tissue Cotton Plan) screen type, for bagging, with a weight of 207.9 g / m2 in a composite of orthophthalic crystal polyester resin matrix. The process for obtaining the composite was tested against the maximum number of layers that could be used without compromising the processability and manufacturing of CPs in compression mold. Five configurations / formulations were selected and tested at 1, 4, 8, 10 and 12 layers of cotton tissue - TPA. TPA was not subjected to chemical treatment, only by passing a mechanical washing process. The composite in its various configurations / formulations was characterized to determine its physical properties. The properties of the composite were higher viability resistance to bending, approaching the matrix and impact resistance, superiority in relation to the polyester resin. Another property that has shown good result compared to other composite has water absorption. Analyzing all the properties set the settings / formulations with higher viability were TA8 and TA10, by combining good processability and higher mechanical strength, with lower loss compared to polyester resin matrix. The composite showed lower mechanical behavior of the resin matrix for all the formulations studied except the impact resistance. The SEM showed a good adhesion between the layers of TPA and polyester resin matrix, without the presence of micro voids in the matrix confirming the efficient manufacturing process of the samples for characterization. The composite proposed proved to be viable for the fabrication of structures with low requests from mechanical stresses, and as demonstrated for the manufacture of solar and wind prototypes, and packaging, shelving, decorative items, crafts and shelves, with good visual appearance.

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