Polymethylmethacrylate
Mostrando 13-24 de 50 artigos, teses e dissertações.
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13. Nitroxide mediated and atom transfer radical graft polymerization of atactic polymers onto syndiotactic polystyrene
'Living' radical graft polymerization was employed to prepare graft copolymers with nitroxide-mediated arylated syndiotactic polystyrene as the backbone and polystyrene (PS), poly(p-methylstyrene) (PMS) and poly(methylmethacrylate) (PMMA) as branches. A two-stage process has been developed to synthesize the macroinitiator. First, syndiotactic polystyrene (sP
Brazilian Journal of Chemical Engineering. Publicado em: 2012-06
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14. Reconstruction of bony facial contour deficiencies with polymethylmethacrylate implants: case report
Facial trauma can be considered one of the most serious aggressions found in the medical centers due to the emotional consequences and the possibility of deformity. In craniofacial surgery, the use of autologous bone is still the first choice for reconstructing bony defects or irregularities. When there is a shortage of donor bone or a patient refuses an int
J. Appl. Oral Sci.. Publicado em: 2011-08
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15. Effect of additives on the compressive strength and setting time of a Portland cement
Improvements in strength and setting time of Portland cements (PC) are needed to enhance their performance as endodontic and load bearing materials. This study sought to enhance the compressive strength and setting time of a PC by adding one of the following additives: 20% and 30% poly-methylmethacrylate (PMMA), 20% and 30% irregular and spherical amalgam al
Brazilian Oral Research. Publicado em: 2010-06
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16. Moldagem por injeção de microcomponentes ópticos poliméricos gerados em insertos usinados por torneamento de ultraprecisão / Injection molding of polymer micro-optical components generated in inserts by ultra-precision turning
Este trabalho analisou o processo de moldagem por injeção de micro elementos ópticos difrativos usinados em insertos de cobre eletrolítico com ferramenta de diamante com ponta única. Quatro tipos de microestruturas características foram selecionados neste estudo, a saber: lente anesférica, lente de Fresnel, grade de difração (blaze grating) e sensor
Publicado em: 2010
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17. Preparação e estudo fotofísico de nanopartículas de sílica marcadas com compostos fluorescentes / Preparation and photophysical study of silica nanoparticles grafted with fluorescent compounds
Photophysical behavior of 9-aminoacridine (9AA) and derivatives, safranine O, auramine and 9-vinylanthracene was investigated, in silica particles. Firstly, commercial silica was modified and grafted with acridinic dyes; however, photophysical studies became unviable, due to its morphology. Silica nanospheres were prepared by Stöber method, with mean diamet
Publicado em: 2009
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18. Estudo da reação tecidual à administração intraperitoneal de polimetilmetacrilato (PMMA) em ratos da linhagem Wistar
This experimental study aims to analyze the responses and tissue migration of Polymethylmetacrylate (PMMA) after implantation in the peritoneal cavity of rats. Methods: We used 80 male Wistar rats, adult, weighing between two hundred and ninety-four hundred grams, distributed in randomly in 4 groups: Group in which it was administered 0.4 ml of 0.9% saline S
Publicado em: 2009
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19. Development of luminescent systems based on PHB and PMMA polymers doped with rare earth complexes / Desenvolvimento de sistemas luminescentes à base dos polímeros PHB e PMMA dopados com complexos de terras raras
This work presents the preparation, characterization and studies of photoluminescence properties based on trivalent rare earth coordination complexes of βdiketonates and salicylates (β-diketonates = acac- and tta-; salicylates = Hsal- and RE3+ = Sm3+, Eu3+, Gd3+ and Tb3+) doped into polymers PHB (poly3hydroxybutyrate) and PMMA (polymethylmethacryla
Publicado em: 2009
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20. Estabilização de fraturas femorais e umerais de cães e gatos mediante pino intramedular e fixação paracortical com polimetilmetacrilato. / Stabilization of femoral and humeral fractures of dogs and cats by Intramedullary pin and paracortical fixation with polymethylmethacrylate.
Humeral and femoral fractures are frequent in the clinical routine of dogs and cats, and various methods of stabilization of the same, with their advantages and disadvantages are proposed in the literature. This study aimed to evaluate a new technique for stabilization of femoral and humeral fractures through use of intramedullary pin and paracortical fixing
Publicado em: 2008
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21. Construction and evaluation of microsystems for flow analysis / Construção e avaliação de microssistemas para analise em fluxo
This work describes the construction, characterization and application of microsystems for flow analysis. Laser ablation was employed for the development of a system in poly(methylmethacrylate), whose channels, with rectangular cross sections measuring 200 mm width by 4,5 mm depth, were sealed with an adhesive plastic film. This device supported flow rates u
Publicado em: 2008
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22. Study of the influence of synthesis conditions on the size particles of polystyrene and poly(methylmethacrylate) with lanthanide complexes / Estudo da influÃncia das condiÃÃes de sÃntese no tamanho de partÃcula de lÃtices de poliestireno e poli(metilmetacrilato) e incorporaÃÃo de complexos de lantanÃdeos
A polimerizaÃÃo em emulsÃo à um processo utilizado na produÃÃo de lÃtex sintÃticos. A tÃcnica à muito utilizada, pois permite a produÃÃo de grande variedade de polÃmeros, permitindo o controle das propriedades fÃsico-quÃmicas e morfolÃgicas do lÃtex. A concentraÃÃo do monÃmero, iniciador, fluxo de nitrogÃnio, velocidade de agitaÃÃo e a
Publicado em: 2008
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23. Evaluation of the resistance to the fracture of temporary fixed prostheses implant-supported varying the extension of the cantilever and the fiber type: glass fibers and poliaramid fibers / Avaliação da resistência à fratura de próteses fixas provisórias implanto-suportadas variando o comprimento do cantilever e o tipo de fibra: fibras de vidro e fibras de poli(aramida)
In the oral rehabilitator treatment, the provisory restorations have extremely importance. The resistance and durability of materials used in the execution are critical, especially in extended treatments and in vast toothless spaces. The goal of this work was to demonstrate the resistance and the types of fracture of specimens that simulate a fixed prosthesi
Publicado em: 2007
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24. Avaliação da replicagem de moldes torneados com ferramenta de diamante usando prensagem a quente em polimetilmetacrilato (PMMA) / Evaluation of the replication of molds generated from single point diamond turning using hot embossing in polymethylmethacrylate (PMMA)
In this work, different types of microstructures were generated by single point diamond turning and microindentation for will replicated through the hot embossing. Tests were carried to evaluate the generation these microstructures by two distinct methods: micro-deformation and micro-machining, planned to observe the replication of the mark generated by the
Publicado em: 2006