Reaction Calorimetry
Mostrando 1-12 de 88 artigos, teses e dissertações.
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1. A Greener Enzymatic Oligoesterification of Biobased Renewable Synthons
Polyesters of xylitol and succinic acid were prepared yielding from 70 to 75% by enzyme-catalyzed esterification using a molar mass from 1:1 to 2:5 at 120 and 140 °C employing from 1 to 10% m/m of enzyme. Control over branching degree was achieved by tuning the reaction conditions (temperature, time, comonomer ratio, enzyme content). This one-step process f
J. Braz. Chem. Soc.. Publicado em: 2021-06
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2. Synthesis, Characterization, and Synergic Photocatalytic Activity of Amorphous TiO2/Chitosan Carbon Microspheres
In this work, we report the synthesis and characterization of new amorphous graphene-like TiO2/chitosan carbon microspheres and its performance as photocatalyst. Four different carbon chitosan microspheres materials were obtained based on the distinctive procedure to incorporate TiO2 and TiOSO4 to chitosan structure by pyrolysis at 600 °C. Detailed characte
J. Braz. Chem. Soc.. Publicado em: 2020-06
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3. Preparation and physicochemical characterization of prazosin conjugated PLGA nanoparticles for drug delivery of flutamide
In the current work, a sustained drug delivery system of flutamide (FLT) was developed using Poly(D,L-lactide-co-glycolide) (PLGA) decorated bypoly(ethylene glycol) (PEG) grafted prazosin (PLGA-PEG-Praz) as a targeting moiety. In a multi-step reaction, PLGA was linked to PEG and prazosin. The structure of the synthesized polymers was confirmed by FTIR and 1H
Braz. J. Pharm. Sci.. Publicado em: 08/04/2019
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4. Synthesis, characterization and antibacterial activity of novel poly(silyl ether)s based on palm and soy oils
Abstract In this research, palm oil and soy oil were used as a natural polyol to prepare novel poly(silyl ether)s. Palm oil and soy oil were first converted to monoglyceride by one step via alcoholysis process in the presence of 0.1% CaO as a catalyst. The monoglycerides were characterized by Fourier transform infrared spectrometer (FT-IR), nuclear magnetic
Polímeros. Publicado em: 29/11/2018
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5. PRODUCTION, CHARACTERIZATION AND USAGE OF A NOVEL DISULFONIC ACID-FUNCTIONALIZED IONIC LIQUID AS A HIGHLY EFFICIENT AND DUAL-FUNCTIONAL CATALYST FOR THE SYNTHESIS OF 1,8-DIOXO-9,10-DIARYL-DECAHYDROACRIDINES
We have produced a novel ionic liquid {N,N,N',N'-tetramethylethylene-diaminium-N,N'-disulfonic acid trifluoroacetate ([TMEDSA][TFA]2)}, and identified it by analysis of 1H NMR, 13C NMR, 19F NMR, mass, TG (thermogravimetry) and DSC (differential scanning calorimetry) data. Then, we have applied [TMEDSA][TFA]2 as a dual-functional catalyst for the production o
Quím. Nova. Publicado em: 2018-07
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6. Severe Plastic Deformation and Additive Distribution in Mg-Fe to Improve Hydrogen Storage Properties
Magnesium (Mg) is a light metal with relatively low cost. Its hydride (MgH2) is interesting for the safe hydrogen storage in solid state and has a high gravimetric capacity of 7.6%. Practical application of Mg is still hampered by high reaction temperatures and slow kinetics. In order to improve it and focus on more viable industrial processing conditions, M
Mat. Res.. Publicado em: 30/10/2017
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7. Differential Scanning Calorimetry study on curing kinetics of diglycidyl ether of bisphenol A with amine curing agents for self-healing systems
ABSTRACT Epoxy resin is one of the most important polymeric matrixes for diverse uses, such as aeronautical, mobile, electronics and others. Providing a material capable of self-healing microcracks will allow it to have a more reliable and longer use. In order to study this new property of self-healing to an epoxy resin, a Differential Scanning Calorimetry (
Matéria (Rio J.). Publicado em: 20/07/2017
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8. Characteristics and enhanced antioxidant activity of glycated Morchella esculenta protein isolate
Abstract Morchella esculenta (L) Pers. is a highly valued edible and medicinal fungus that remains underutilized. For this study, the effects of glycation treatment on antioxidant activity and characteristics of the M. esculenta protein isolate (MPI) were investigated via the Maillard reaction. Conjugation between MPI and xylose was proven via UV-vis, FT-IR,
Food Sci. Technol. Publicado em: 20/07/2017
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9. SELECTIVE SYNTHESIS OF PEG-MONOESTER USING CESIUM HETEROPOLY ACID AS HETEROGENEOUS CATALYST
Esterification of oleic acid with polyethylene glycol 600 (PEG-600) to produce polyethylene glycol monooleate (PEG-monooleate) and polyethylene glycol dioleate (PEG-dioleate) as by-product has been studied in the presence of heterogeneous acid catalysts, i.e. cesium heteropoly acid (Cs HPA). The results are compared with those obtained from a classical homog
Quím. Nova. Publicado em: 2017-06
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10. Novos surfactantes alquil poliglicosídicos à base de amilose extraída da batata inglesa (Solanum tuberosum L.)
Alkyl polyglycosides (APGs) are new biodegradable surfactants, non-toxic, synthesized from abundant renewable sources, potentially more appropriate than anionic surfactants. A range of glycosides denoted APG-Cy was synthesized by the Köenig-Knorr reaction using C10, C16 and C18 alcohols and derived from the degradation of amylose from English potato. The mo
Quím. Nova. Publicado em: 2017-04
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11. Characteristics and thermodynamics of the interaction of 6-shogaol with human serum albumin as studied by isothermal titration calorimetry
ABSTRACT The interaction between 6-shogaol, a pharmacologically active ginger constituent, and human serum albumin (HSA), the main in vivo drug transporter, was investigated using isothermal titration calorimetry (ITC). The value of the binding constant, Ka (5.02 ± 1.37 × 104 M−1) obtained for the 6-shogaol-HSA system suggested intermediate affinity. Ana
Braz. J. Pharm. Sci.. Publicado em: 2016-09
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12. EVALUACIÓN TÉRMICA DEL CURADO DE ADHESIVOS BASE SBR USANDO PERÓXIDO DE DICUMILO
Curing is an important process in adhesive formulation, but scant reports on the study of the kinetics of curing in adhesive are currently available, particularly for formulations including styrene-butadiene copolymers. The focus of the present work was to thermodynamically quantify the curing reaction in pressure-sensitive adhesives (PSA) obtained from s
Quím. Nova. Publicado em: 2015-06