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Synthesis of Phenyl Esters Using SiO2-SO3H Catalyst in Conventional Heating and Microwave-Irradiated Esterification Processes
(Amer Scientific Publishers, 2019-06-01)
A SiO2-SO3H amorphous catalyst containing a small surface area of 115.0 m(2)g(-1) and 1.32 mmol H+/g was prepared from fine construction sand and sodium carbonate and sulfonated with H2SO4. In a 10% (w/w) basis, it is very ...
Devulcanization of natural rubber industry waste in supercritical carbon dioxide combined with diphenyl disulfide
(Pergamon-Elsevier Science Ltd, 2020-12)
The elimination of rubber wastes without affecting the environment is one of the most important challenges of the 21st century waste management. Accordingly, the present work is focused on the recycling of natural rubber ...
DIELECTRIC RELAXATIONS IN POLY(THIOCARBONATES)
(JOHN WILEY & SONS INC, 1994)
The dielectric absorptions observed on six poly (thiocarbonates) (PTC) containing different substituents in the interphenylic carbon atom are subjected to a study. The a relaxation process associated with the glass transition ...
Ultrasound-assisted leaching-dispersive solid-phase extraction followed by liquid-liquid microextraction for the determination of polybrominated diphenyl ethers in sediment samples by gas chromatography-tandem mass spectrometry
(Elsevier Science, 2010-06)
Ultrasound-assisted leaching-dispersive solid-phase extraction followed by dispersive liquid-liquid microextraction (USAL-DSPE-DLLME) technique has been developed as a new analytical approach for extracting, cleaning up ...
Efeitos da administração do disseleneto de difenila sobre o dano hepático induzido por 2-nitropropano, cádmio e tetracloreto de carbono
(Universidade Federal de Santa MariaBRBioquímicaUFSMPrograma de Pós-Graduação em Ciências Biológicas: Bioquímica Toxicológica, 2008-02-01)
The liver presented exceptional characteristics, like controlling energy production, immunological defenses, and blood reserve. In the environment like in the work place, the human is exposed to a different kind of hepatotoxic ...
1,1-Diphenyl-4-(thiophen-2-yl)but-3-yn-1-ol
(2018-11)
The asymmetric unit of the title homopropargyl alcohol, C20H16OS, contains two independent molecules comprising a hydroxy group, a 3-(2-thiophenyl)- propargylic moiety and two aromatic rings linked to a central carbon atom. ...
1,1-Diphenyl-4-(thiophen-2-yl)but-3-yn-1-ol
(2018-11)
The asymmetric unit of the title homopropargyl alcohol, C20H16OS, contains two independent molecules comprising a hydroxy group, a 3-(2-thiophenyl)- propargylic moiety and two aromatic rings linked to a central carbon atom. ...
Optimization of β-cyclodextrin-based extraction of antioxidant and anti-browning activities from thyme leaves by response surface methodology
(Elsevier, 2018-11)
Thyme (Thymus vulgaris) has been demonstrated to extend the shelf-life of food products, being also a potential source of bioactive compounds. The aim of this research was to optimize the ultrasound assisted extraction ...