Copolymers
Mostrando 1-12 de 272 artigos, teses e dissertações.
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1. BINARY MICELLES (E45S8/F127) FOR QUERCETIN AND GRISEOFULVIN SOLUBILISATION
Micelles have aroused interest due to their ability to assist in the transport of poorly soluble drugs. In this study the mixture of copolymers F127/E45S8 in different proportions (F/ES 30/70, 50/50 and 70/30) was performed to improve the bioavailability of griseofulvin and quercetin. The results of cytotoxicity (MTT assay) revealed that the copolymers F127
Quím. Nova. Publicado em: 2020-09
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2. Synthesis and characterization of mesoporous materials with SBA and MCM structure types
Resumo Materiais mesoporosos são estruturas promissoras para aplicação em catálise e adsorção devido à elevada área superficial e grande tamanho dos poros. Materiais mesoporosos foram sintetizados pelo método hidrotérmico com novos surfactantes, distintos daqueles observados na literatura, a fim de realizar um estudo de sua estrutura e obter materi
Cerâmica. Publicado em: 14/11/2019
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3. Microbial Synthesis and Characterization of Biodegradable Polyester Copolymers from Burkholderia Cepacia and Cupriavidus Necator Strains Using Crude Glycerol as Substrate
Abstract Polymers are materials of pronounced importance in the modern world, since they are massively present in everyday life, especially in the form of packaging. However, most of these materials are derived from non-renewable sources and their disposal generates large volumes of waste, which is extremely damaging to natural environments. In this context,
Braz. arch. biol. technol.. Publicado em: 24/10/2019
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4. Obtenção e caracterização de copolímeros de Poliacrilonitrila (PAN) para uso em processos de fiação em extrusora
RESUMO A disponibilidade de novos materiais, processos e equipamentos sempre traz perspectivas favoráveis ao mercado. A busca por processos alternativos e pela redução do custo da obtenção de precursores de materiais de alto desempenho tem se tornado primordial para o desenvolvimento do setor industrial de produtos com valores mais acessíveis, visando
Matéria (Rio J.). Publicado em: 16/09/2019
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5. Sulfonated Styrene-Acrylic Acid Copolymers with pH-Indicator Property
In this study, a polymer pH-indicator was synthesized by sulfonation of poly(styrene-co-acrylic acid) with concentrated sulfuric acid. The synthesized polymer pH-indicator exhibited pH-responsive color changes in aqueous solutions, being purple in alkaline medium (pH < 4), whereas yellow in acidic medium (pH > 9). The sulfonation process extent and polymer c
J. Braz. Chem. Soc.. Publicado em: 16/09/2019
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6. Synthesis and Characterization of Modified Polystyrene with Oleic Acid and an Allyl Ester Derivative
Polystyrene (PS) is one of the most widely used polymers in the world, having a wide applicability. PS can be used in pure or modified forms, and the commercial materials most used for modifications are non-renewable and have high costs. For this reason, studies have been carried in order to evaluate renewable components application such as vegetable oils, f
Mat. Res.. Publicado em: 05/09/2019
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7. Numerical Simulation of Atom-Transfer Radical Polymerization of tert-butyl Methacrylate
Block copolymers based on tert-butyl methacrylate (tBMA) have many uses, such as thermo‐responsive polymers, amphiphilic copolymers, and many applications in the medical field. Atom-transfer radical polymerization (ATRP) is the main technique to produce these controlled macromolecular architectures. This paper provides a simplified kinetic modeling and com
Mat. Res.. Publicado em: 02/09/2019
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8. Poly(trimethylene carbonate-co-L-lactide) electrospun scaffolds for use as vascular grafts
Currently, there is great clinical need for suitable synthetic grafts that can be used in vascular diseases. Synthetic grafts have been successfully used in medium and large arteries, however, their use in small diameter vessels is limited and presents a high failure rate. In this context, the aim of this study was to develop tissue engineering scaffolds, us
Braz J Med Biol Res. Publicado em: 12/08/2019
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9. Synthesis and characterization of amphiphilic block copolymers by transesterification for nanoparticle production
Abstract Poly(ε-caprolactone)-block-poly(ethylene glycol)-poly(ε-caprolactone) (PCL-PEG-PCL, triblock) and Poly(ε-caprolactone)-block-(poly(ethylene oxide)−poly(propylene oxide)−poly(ethylene oxide)-poly (ε-caprolactone) (PCL-PEO-PPO-PEO-PCL, pentablock) copolymers were synthesized by transesterification with reduction of PCL molecular mass, enabling
Polímeros. Publicado em: 04/07/2019
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10. Coating of urea granules by in situ polymerization in fluidized bed reactors
Abstract The main objective of the present work is to produce and characterize urea granules coated with polymers prepared with aqueous solutions of acrylic acid and glycerol. Both coating and drying of urea granules were performed in a fluidized bed reactor. Fourier transform infrared spectroscopy analyses indicated the presence of poly(acrylic acid) and ac
Polímeros. Publicado em: 21/03/2019
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11. Synthesis and characterization of the photoswitchable poly(methyl methacrylate- random-methacrylate spirooxazine)
Abstract The photoswitchable poly(methyl methacrylate-random-methacrylate spirooxazine) was synthesized via atom transfer radical polymerization with the feed mole ratio of MMA/MSp comonomer of about 5.5/1. Well-defined poly(methyl methacrylate- random-methacrylate spirooxazine) have been obtained with the average molecular weight (Mn) of 6500 g/mol and pol
Polímeros. Publicado em: 18/03/2019
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12. Process Evaluation of Sugar-Based Polymeric Colloidal Nanocarrier Formation
Abstract Several studies have demonstrated that sugar-based nanocarriers are recommended to develop drug delivery systems since they are biocompatible and biodegradable and might improve the therapeutic index of currently used drugs by reducing their toxicity and enhancing their bioavailability. Therewith, this work studied the processing conditions to forma
Mat. Res.. Publicado em: 31/01/2019