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Master's Dissertation
DOI
10.11606/D.88.2003.tde-05122014-173313
Document
Author
Full name
Ana Cláudia Ramos
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2003
Supervisor
Committee
Oliveira Junior, Osvaldo Novais de (President)
Gonzalez, Jose Pedro Donoso
Job, Aldo Eloizo
Title in Portuguese
Caracterização elétrica e mecânica de fitas isolantes de blendas de PVC
Keywords in Portuguese
Blendas de PVC
Caracterização elétrica
Caracterização mecânica
Abstract in Portuguese
O policloreto de vinila (PVC) é comercialmente utilizado em diversas aplicações, destacando-se os filmes flexíveis. Para a fabricação destes compostos de PVC, utilizam-se vários tipos de aditivos, tais como plastificantes, estabilizantes térmicos, lubrificantes, retardantes de chama e outros. No presente trabalho foram produzidos compostos de PVC a partir de uma formulação referencial, variando-se a concentração de pigmento, carga, modificador de impacto e plastificantes. A preparação das amostras foi feita através de uma misturadeira intensiva (Mecanoplast), calandra de 2 rolos e prensa, obtendo-se placas flexíveis de 1 mm de espessura. Os resultados das análises térmicas (DMA e TGA) mostraram que o uso e a quantidade de plastificantes foram os principais fatores que influenciaram as propriedades de mudança de fase (Tg) e estabilidade térmica do material. As análises das propriedades mecânicas (resistência à tração e alongamento) mostraram que estas propriedades foram influenciadas pelas proporções de cargas, modificador de impacto e plastificantes na composição. As medidas elétricas (rigidez dielétrica) não foram afetadas pela variação da adição de materiais nas amostras analisadas
Title in English
Electric and mechanical characterization of insulating films of PVC blends
Keywords in English
Electric characterization
Mechanical characterization
PVC blend
Abstract in English
Poly(vinyl chloride) (PVC) is commercially used in several applications, especially in flexible films. Aiming the production of products, PVC can be filled with a variety of additives, like plasticizers, thermal stabilizers, lubricants, flame-retardants and others. In this work PVC compounds were produced based on a known formulation, using different weight ratios for pigment, filler, impact modifier and plasticizers. Samples were prepared through intensive mixing using two rolls calendrer followed by a hot press to form films with 1 mm thickness. Thermal analysis results (DMA and TGA) showed that plasticizers are the most important factors that influenced the material properties such as phase behavior (Tg) and thermal stability. Mechanical properties analysis (breaking strength and elongation) were influenced by fillers, impact modifier and plasticizers proportions used in the composition. Electrical properties (dielectric breakdown strength) were not affected by different weight ratios in the analyzed samples
 
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AnaClaudiaRamosM.pdf (16.43 Mbytes)
Publishing Date
2014-12-08
 
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