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Itens para a visualização no momento 61-70 of 78
Síntese de poliuretano termoplástico modificado com POSS via extrusão reativa
(2014-06-03)
In this work, thermoplastic polyurethanes (TPU) were synthesized in solution process and reactive extrusion in twin-screw extruder. The TPUs were obtained with the use of pre-polymer based on 4,4´-Methylenediphenyl ...
Estudo das propriedades magnéticas e estruturais de (Nd, Pr) FeB nanocristalino com adição de TiC e Cr
(2014-05-30)
The addition of both Ti and Cr-C refine the grains in nanocomposites of Nd-Fe-B, increasing substantially the coercive field Hc . This motived our investigation of the effect of the addition of Ti-C and Cr to nanocomposites ...
Estudo para a otimização do processamento de formulações de resina fenólica aplicada à material de fricção
(2014-05-22)
Friction materials are composites the polymer matrix of which is usually a novolak phenolic resin. Performance requirements of friction materials demand a steep control of the processing conditions, during crosslinking ...
Desenvolvimento de membranas de polissulfona para imobilização de lipase
(2014-05-13)
Preparation and characterization of polysulfone (PSU) membranes and the immobilization of lipase enzyme in these membranes to produce enantioselective membranes, in order to separate chiral compounds, is the subject of the ...
Expansão térmica sintonizável do ZrW2O8
(2014-05-14)
Zirconium tungstate (a-ZrW2O8) exhibits isotropic negative thermal expansion over a wide range of temperature. Under high-pressures this material transforms to a metastable amorphous phase (a-ZrW2O8). a-ZrW2O8 can be fully ...
Síntese e Caracterização de elastômeros microcelulares de poliuretano
(2014-05-13)
In this work, three different microcellular polyurethanes elastomers (EMPU) based on 4,4-diphenylmethane diisocyanate (MDI) with different rigid phase contents were prepared (Formulations 1, 2 and 3 with 32, 35 and 42% of ...
Desenvolvimento de nanocompósitos de borracha clorobutílica/borracha natural com montmorilonita para aplicação em revestimentos internos de pneus sem câmara de ar
(2014-06-23)
The aim of this work is combining the properties of chlorobutyl rubber (CIIR) and natural
rubber (NR) in a binary blend for applications in tubeless tire inner liner, using
organomodified clay - montmorillonite (OMMT) – ...
Geração de EPS no tratamento de água residuária de refinaria de petróleo em MBR e sua influência em micro e ultrafiltração
(2014-06-24)
The production of extracellular polymeric substances (EPS) in membranes bioreactor
(MBR) for the removal of organic matter and nitrogen compounds present in wastewater from
oil refinery as well as a possible influence ...
Desenvolvimento de bandas de rodagem para pneus de automóvel com aditivos alternativos
(2014-06-24)
The present study aimed at characterizing and determining the technical viability of a natural rubber
tread (NR) with the incorporation of oil proceeding from vegetable source and vulcanization
activator with less zinc ...