Thermoplastic Polyurethane
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Bonding properties and crystallization kinetics of thermoplastic polyurethane adhesive
ABSTRACT The advantages of heterophasic thermoplastic polyurethanes (TPUs), such as their phase behavior and mechanical properties, make these materials an important class of adhesives. Whereas the amorphous phase contributes to good adhesion properties, the crystalline phase is responsible for the cohesive force of TPU adhesives. This work investigates the
Matéria (Rio J.). Publicado em: 06/12/2018
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2. Improved Thermal Stability and Wettability Behavior of Thermoplastic Polyurethane / Barium Metaborate Composites
In this paper, it was targeted to the enhance thermal stability and wettability behavior of thermoplastic polyurethane (TPU) by adding barium metaborate. TPU-Barium metaborate composites were prepared by adding various proportions of barium metaborate to TPU. The chemical structures of the composites were characterised by fourier transform infrared spectrosc
Mat. Res.. Publicado em: 26/02/2016
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3. Flexible thermoplastic composite of Polyvinyl Butyral (PVB) and waste of rigid Polyurethane foam
This study reports the preparation and characterization of composites with recycled poly(vinyl butyral) (PVB) and residue of rigid polyurethane foam (PUr), with PUr contents of 20, 35 and 50 wt %, using an extruder equipped with a Maillefer single screw and injection molding. The components of the composites were thermally characterized using differential sc
Polímeros. Publicado em: 2015-04
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4. Degradación in-vitro de mezclas de poliuretano termoplástico y almidón modificado
The chemical structure of the cassava starch was modified by acylation. Cassava starch modified was mixed with urethane prepolymer based on castor oil modified by transesterification (MCO) and isophorone diisocyanate (IPDI) in order to prepare starch-blended thermoplastic polyurethanes. Polyurethanes were exposed to in-vitro degradation then monitored for ch
Polímeros. Publicado em: 07/06/2013
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5. Castor oil and commercial thermoplastic polyurethane membranes modified with polyaniline: a comparative study
The study of conducting polymeric membranes is decisive in some areas, as in fuel cells and electrodialysis. This work aims the study of membranes using conventional and conductive polymers blends. Two types of polyurethane were used as conventional polymers, commercial thermoplastic polyurethane and polyurethane synthesized from castor oil and 4-4-dicyclohe
Mat. Res.. Publicado em: 10/05/2013
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6. Thermoplastic polyurethane synthesis using POSS as a chain modifier
In this study, thermoplastic polyurethanes (TPUs) were synthesized using the one-shot process in solution. To obtain the samples n-phenylaminopropyl polyhedric oligomeric silsesquioxane (POSS) was added as a chain modifier during the synthesis in four different amounts. The samples were characterized by infrared spectroscopy (FTIR), thermogravimetric analysi
Materials Research. Publicado em: 31/07/2012
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7. Electrical conductivity and thermal properties of functionalized carbon nanotubes/polyurethane composites
Multi-walled carbon nanotubes (MWCNTs) functionalized with amine and carboxyl groups were used to prepare polyurethane/MWCNT nanocomposites in two distinct concentrations: a lower value of 1 mass% (spray coating) and a higher one of ~50 mass% (buckypaper based). The MWCNT-NH2 sample contained only 0.5 mass% of amine groups, whereas MWCNT-COOH contained 5 mas
Polímeros. Publicado em: 13/03/2012
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8. Síntesis de poli ácido láctico y poli ricinoleato empleando calentamiento por microondas y su utilización en la producción de termoplasticos de poliuretano
In this paper we report on the synthesis of thermoplastic polyurethane (TPU) using oligomers synthesized from DL Lactic acid and ricinoleic acid. These polyols were obtained from renewable sources by polycondensation of monomers without catalysts. The effect of microwaves on the reactions was evaluated, where non-thermal effects were found to lower the activ
Polímeros. Publicado em: 13/05/2011
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9. Nanocompósitos de poliuretano termoplástico com argila organofílica / Thermoplastic polyurethane nanocomposites with organoclay
A vasta gama de sistemas poliméricos classificados como compósitos tem sido alvo constante e crescente do meio acadêmico e científico. A possibilidade de obtenção de propriedades combinadas e múltiplas, associada a nanotecnologia, enriquece a condição de pesquisa abrindo assim uma extensa área de atuação. Neste trabalho foi proposto o estudo de n
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/12/2010
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10. Síntese de poliuretano termoplástico modificado com POSS via extrusão reativa
Neste trabalho, foram sintetizados poliuretanos termoplásticos (TPU) via solução em reator e via extrusão reativa em extrusora dupla rosca. Os TPUs foram obtidos com o uso de pré-polímero 4,4‟-difenilmetano (MDI) e poliol poliéster, a hidroquinona bis-2-(hidróxietil)-éter (HQEE), e o n-fenilaminopropil-POSS. Os reagentes e produtos foram carac
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/12/2010
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11. Reciclagem de resíduo de espuma rígida de poliuretano através da incorporação de polímeros termoplásticos, ABS, PSAI e OS
Nowadays, the refrigeration industry uses the rigid polyurethane foam (PUR) as a thermal insulation and structural component in doors and cabinets of refrigerators and freezers. The waste of PUR generated in the manufacturing represents great volumes, which are considered an environmental problem. Some attempts of recycling this material have already been ex
Publicado em: 2005
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12. Avaliação do processamento e propriedades de compósitos de poliuretano termoplástico reforçados com fibras silexil, em comparação com outras fibras/cargas comercialmente utilizadas
The introduction of fibers/fillers in polymers is a common strategy to produce material with enhanced properties and low densities for applications such as in the automobile industry. In this work, a novel kind of an inorganic short fiber (Silexil), obtained from mineral resources, was characterized and applied as a reinforcing agent in thermoplastic polyure
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/09/2004