Poliurethane
Mostrando 1-5 de 5 artigos, teses e dissertações.
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1. Estudo do efeito do uso de poliol reciclado nas propriedades mecânicas da espuma rígida de poliuretano. / Study of the effects of the use of a recycled polyol in the main mechanical properties of a rigid polyurethane foam.
O poliuretano (PU) representa um dos grupos mais importantes de polímeros, com uma grande variedade de tipos e alta versatilidade de aplicações. É uma classe de polímeros na qual as unidades formadoras da cadeia polimérica são interligadas por ligações uretânicas, -O(CO)(NH)- . As macromoléculas são formadas pela reação de pré-polímeros conte
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/05/2011
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2. Adição de poliuretana em pastas de cimento para poços de petróleo como agente de correção do filtrado
Chemical admixtures, when properly selected and quantified, play an important role in obtaining adequate slurry systems for quality primary cementing operations. They assure the proper operation of a well and reduce costs attributed to corrective cementing jobs. Controlling the amount lost by filtering through the slurry to permeable areas is one of the most
Publicado em: 2008
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3. "Biodegradação de poliuretano derivado do óleo de mamona" / "Biodegradation of poliurethane derived of castor oil"
The environment requires polymers that can be completely biodegraded through the action of several environmental factors, including microorganisms. The present work studied biodegradation of polyurethane foam obtained from castor oil, a renewable natural material, constituting a viable alternative to traditional PU foams. Biodegradation was compared for cast
Publicado em: 2006
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4. Homogeneous particlebord from bamboo bonded by polyurethane resin castor oil based / Chapas de particulas homogeneas de bambu aglomeradas com resinas poliuretana bi-componente a base de oleo de mamona
The aim of this research Homogeneous Particleboard of Bamboo Bonded whith Poliurethane Resin Castor Oil Based was to manufacture and to evaluate particleboards made with two alternative materials, looking for the productive process sustainability. Particles from Bambusa vulgaris were employed due to the its fast production cycle and its availability in B
Publicado em: 2006
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5. Characterization techniques for evaluation of mechanical properties of acrylic polyurethane coating of optical fiber. / Técnicas de caracterização para avaliação das propriedades mecânicas dos revestimentos de poliuretano acrilado de fibra óptica.
The datas and information transmission in the optical fiber have been increasing in the last years. The interest to evaluate the mechanical reliability became necessary, after that a optical fiber, from a cable installed, was cracking very easily. The principal aim of this work was establishing methodologies to evaluate the polymer degradation state. Through
Publicado em: 2002