Cure Temperature
Mostrando 13-24 de 43 artigos, teses e dissertações.
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13. Study of castor oil polyurethane - poly (methyl methacrylate) semi-interpenetrating polymer network (SIPN) reaction parameters using a 2³ factorial experimental design
In this work was employed a 23 factorial experiment design to evaluate the castor oil polyurethane- poly(methyl methacrylate) semi-IPN synthesis. The reaction parameters used as independent variables were NCO/OH molar ratio, polyurethane polymerization time and methyl methacrylate (MMA) content. The semi-IPNs were cured over 28 h using two thermal treatments
Publicado em: 2010
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14. Contribuição ao estudo da aderência de revestimentos de argamassa e chapiscos em substrato de concreto / Contribution to study of the bond strength of mortar renderings and slurry mortars on concrete substrate
A grande ocorrência de manifestações patológicas em revestimentos de argamassa associadas à falha de aderência a substratos de concreto cada vez mais chama a atenção do meio técnico, pois além de prejuízos às edificações, pode representar risco aos usuários, motivando diversos trabalhos sobre o assunto. Abordando o problema, a presente dissert
Publicado em: 2010
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15. Influência do pré-aquecimento e do modo de ativação na resistência máxima à tração e no grau de conversão de dois cimentos resinosos de dupla ativação.
This study evaluated the degree of conversion (DC) using Fourier transformed infrared analysis (FTIR) and ultimate tensile strength (UTS) of pre-heated dual-cured resin cements (RCs) exposed to different activating modes: light-activation through a glass slide (GS) or through a pre-cured 2-mm thick resin composite disc (A2 - A2 shade), or specimens were allo
Publicado em: 2010
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16. INFLUENCE OF SiO2 ON MECHANICAL PROPERTIES OF DGEBA / INFLUÊNCIA DO SIO2 NAS PROPRIEDADES MECÂNICAS DA DGEBA
In this study we used a different route, simple and economical: the dissolution of the SiO2 powder DGEBA with a hardener to base polymercaptan ( aradur 90 ). Analysis was performed micro hardness in different percentages of the concentration of SiO2. The hardness of multicomponent solid is approximately equal to the average hardness of the material compositi
Publicado em: 2009
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17. Estudo e caracterização de matérias-primas para o desenvolvimento de blocos sílico-calcários
The types of products manufactured calcium silicate blocks are very diversified in its characteristics. They include accessory bricks, blocks, products in dense material, with or without reinforcements of hardware, great units in cellular material, and thermal insulating products. The elements calcium silicate are of great use in the prefabricated constructi
Publicado em: 2009
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18. Aderência de revestimentos externos de argamassa em substratos de concreto : influência das condições de temperatura e ventilação na cura do chapisco / External mortar rendering bond in concrete substrates : influence of temperature and ventilation conditions during the slurry layer curing
A prevenção de manifestações patológicas em revestimentos de argamassa, em especial os descolamentos, é refletida no interesse das empresas construtoras e pesquisadores por um maior conhecimento das propriedades dos elementos constituintes do sistema, bem como dos fatores externos. Destes pode-se citar as variáveis que intervêm nos mecanismos de ader
Publicado em: 2008
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19. Adhesiveness of cold rolled steels for car body parts
The aim of this work was to evaluate the adhesiveness of uncoated and zinc-electrogalvanized steel sheets used in the automotive industry. Three types of adhesives, one acrylic and two epoxy resins, were employed to join low carbon cold rolled steels, one uncoated and another electrogalvanized, both previously degreased or chemically pickled. Mechanical stre
Materials Research. Publicado em: 2007-09
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20. Alterações cromáticas de silicones utilizados na confecção de próteses faciais após envelhecimento / Chromatic alterations in silicons used for facial prosthesis after aging
Owing to the fact that pigmented silicons used in the making of facial prosthesis or the rehabilitation of patients with facial flaws present , in clinical experience, chromatic alteration as time passes by, and due to the shortage of experimental papers in the specific literature, specially in relation to industrial silicon of acetic cure, the present paper
Publicado em: 2007
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21. Study of adhesion time, temperature and gluing pressure on shear strength of Eucalyptus grandis wood glued with adhesive solvent free / Estudo do tempo de adesão, da temperatura e da pressão de colagem na tensão limite de cisalhamento de uniões de madeira de Eucalyptus grandis coladas com adesivo sem solvente
The use of glu-lam is a viable alternative for exploitation of all wood potential presenting a series of advantages. The linking between layers however has a basic paper in glu-lam good quality. Therefore for a good performance of glu-lam structures it is fundamental the choice of an adhesive which has a great mechanics resistance and also resistance to the
Publicado em: 2007
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22. Dynamics of defects and surface structure formation in reticulated vitreous carbon
Morphological and microstructure properties of reticulated vitreous carbon (RVC) were analyzed by scanning electron microscopy (SEM), micro-Raman spectroscopy and x-ray diffraction (XRD) techniques as a function of heat treatment temperature (HTT). Samples produced in the HTT range of 1000 to 2400 K have demonstrated a strong dependence of HTT in their struc
Brazilian Journal of Physics. Publicado em: 2006-06
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23. Characterization of cure of carbon/epoxy prepreg used in aerospace field
Carbon/epoxy 8552 prepreg is a thermoplastic toughened high-performance epoxy being used in the manufacture of advanced army material. Understanding the cure behavior of a thermosetting system is essential in the development and optimization of composite fabrication processes. The cure kinetics and rheological behavior were evaluated using a differential sca
Materials Research. Publicado em: 2005-09
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24. In vitro and in vivo appraisal of pre-heated resin composite with relation to polymerization kinetics / "Avaliação in vitro e in vivo da resina composta pré-aquecida em relação à cinética de polimerização
This work examined multiple aspects of pre-heating dental resin composite prior to light-curing: the monomer conversion and polymerization kinetics as a function of cure temperature, light-exposure duration and depth; the performance of the heating device (maximum temperature, thermal stability of device and temperature change when pre-heating compules); and
Publicado em: 2005