Polyamides
Mostrando 1-12 de 36 artigos, teses e dissertações.
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1. Evaluation of degradation of furanic polyamides synthesized with different solvents
Abstract Aromatic polyamides have properties of industrial relevance. However, the industrial and technological advancement has followed the trend of sustainability by seeking renewable source materials. In this work, polyamides were synthetized using 2,5-furandicarboxylic acid with p-phenylene diamine, triphenyl phosphite and two solvents (NMP and DMAc). To
Polímeros. Publicado em: 27/06/2019
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2. Synthesis and characterization of new soluble polyamides from Acenaphtohydrazinomercaptotriazole diamine
AbstractA diamine Acenaphtohydrazinomercaptotriazole (AHTD) was synthesized in one step from acenaphthoqinone and 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole. The diamin was characterized by FTIR, 1HNMR, 13CNMR and melting point. Diamin was used to prepare novel polyamides. The low temperature solution polycondensation of diamin with tow aromatic and tow a
Polímeros. Publicado em: 2015-08
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3. Aplicações de enzimas na síntese e na modificação de polímeros
Enzymes are biological catalysts that offer great potential for use in the synthesis and modification of polymers, being more specific and greener than chemical catalysts. In this work, enzymes from the classes of hydrolases (lipase, cutinase and protease) and of oxidoreductases (horseradish peroxidase, manganese peroxidase and laccase) were identified as th
Quím. Nova. Publicado em: 2014
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4. Avaliação comparativa de materiais poliméricos em coletores de admissão para aplicações de motores diesel / Comparative evaluation of polymeric materials on intake manifold for diesel engines application
In the modem world where we live, due to incited competition in the automobilist market, emerges the necessity an engine much more economic and il is worsen by the international competition with the Asian markets. Thus, accelerate not only the race for the raise of the quality and cost reduction of products, but also for the environment topics, such as the r
Publicado em: 2010
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5. Avaliação da eficacia de materiais texteis na atividade fisica / Evaluation of textile materials efficiency in physical activity
The present study Evaluation of Textile Materials Efficiency in Physical Activity compared how the different properties of fibers, like cotton and polyamide 6.6, affect sportive performance. The purpose of this study was to evaluate the improvement of physical performance during physical activities due the use of clothing made with high technology fabric
Publicado em: 2008
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6. Estudo do efeito da radiação ionizante sobre as propriedades da poliamida 6 com reforço de fibra de vidro / Study of the effect of ionizing radiation on properties of polyamide 6 with fibreglass reinforcement
É cada vez maior a utilização de polímeros reforçados com fibra de vidro no mercado nacional. Entre eles utiliza-se a poliamida 6 que apresenta ótima resistência à tração, ao impacto e à absorção de umidade comparada à poliamida 6 sem reforço de fibra de vidro, sendo atualmente utilizada na indústria automobilística em peças sob o capô, em
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/05/2007
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7. Blendas de poliamida reciclada e polietileno proveniente da recuperação de embalagens multicamadas / Blends of recicled polyamide and polythylene recovered from multilayer packing waste
Blendas de poliamida e polietileno são exemplos de misturas imiscíveis e incompatíveis. Entretanto, a compatibilidade pode ser alcançada adicionando-se compatibilizantes ou promovendo a mistura reativa. Neste projeto teve-se como objetivo o preparo e a caracterização de blendas de poliamida-66 reciclada (rPA-66) e diferentes polietilenos, incluindo mat
Publicado em: 2007
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8. Blendas de poliamidas e poli-(metacrilato de metila)
The miscibility of polyamide (PA)/ poly-(methyl methacrilate) (PMMA) blends was investigated. Emphasis was dane on the morphology of mixtures obtained by different preparation methods. Films of polyamides-6, 6/9 and 12 and PMMA were prepared from solutions in m-cresol. The PA-6/ PMMA blend showed clearly the highest miscibility. This blend was then prepared
Publicado em: 1995
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9. The theoretical limits of DNA sequence discrimination by linked polyamides
Linked polyamides bind in the minor groove of double-stranded DNA in a partially sequence-specific manner. This report analyzes the theoretical limits of DNA sequence discrimination by linked polyamides composed of two to four different types of heterocyclic rings, determining (i) the optimal choice of base-binding specificity for each ring and (ii) the opti
The National Academy of Sciences.
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10. Cyclic polyamides for recognition in the minor groove of DNA.
Small molecules that specifically bind with high affinity to any designated DNA sequence in the human genome would be useful tools in molecular biology and potentially in human medicine. Simple rules have been developed to rationally alter the sequence specificity of minor groove-binding polyamides containing N-methylimidazole and N-methylpyrrole amino acids
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11. Binding site size limit of the 2:1 pyrrole-imidazole polyamide-DNA motif.
Polyamides containing N-methylimidazole (Im) and N-methylpyrrole (Py) amino acids can be combined in antiparallel side-by-side dimeric complexes for sequence-specific recognition in the minor groove of DNA. Six polyamides containing three to eight rings bind DNA sites 5-10 bp in length, respectively. Quantitative DNase I footprint titration experiments demon
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12. Estimation of the DNA sequence discriminatory ability of hairpin-linked lexitropsins
Three- and four-ring polyamides containing N-methylimidazole and N-methylpyrrole, and their hairpin-linked derivatives, bind side-by-side in the minor groove of DNA in a sequence-specific manner. The sequences recognized by side-by-side molecules are dependent on the pairings of the polyamide rings to the bases. In this study we report a mathematical model f
The National Academy of Sciences of the USA.