منابع مشابه
Controlled hydrogenative depolymerization of polyesters and polycarbonates catalyzed by ruthenium(II) PNN pincer complexes.
Ruthenium(II) PNN complexes depolymerize many polyesters into diols and polycarbonates into glycols plus methanol via hydrogenation. Notably, polyesters with two methylene units between ester linkages depolymerize to carboxylic acids rather than diols. This methodology represents a new approach for producing useful chemicals from waste plastics.
متن کاملPhotolytic depolymerization of alginate.
A photochemical reaction has been developed for the partial de-polymerization of sodium alginate, a polysaccharide utilized in medicine, pharmacy, basic sciences and foods. An aqueous solution of sodium alginate was photochemically depolymerized to approximately 40% of its average molecular weight using ultraviolet light in the presence of titanium dioxide catalyst at pH 7 over a period of 3h. ...
متن کاملSynchrotron Radiation Studies on Even-Odd and Odd-Even Nylons
Aliphatic polyamides derived from odd diamine or odd dicarboxylic acid units cannot adopt a conventional sheet structure when molecular chains have an all trans conformation. However, typical fiber diffraction patterns of this sheet structure were observed in several polyamides derived from odd units such as nylons 65 and 56. Consequently, a new structure based on the establishment of intermole...
متن کاملEnzymatic depolymerization of emulsan.
Emulsan, the polyanionic emulsifying agent synthesized by Acinetobacter calcoaceticus RAG-1, was depolymerized by an enzyme obtained from a soil bacterium YUV-1. The extracellular emulsan depolymerase was produced when strains RAG-1 and YUV-1 were grown together on agar medium. The enzyme was extracted from the agar and concentrated by ultrafiltration and ammonium sulfate precipitation. The mol...
متن کاملDepolymerization and Degradation
Almendros, G., Martín, F. and González-Vila, F.J., 1987. Depolymerization and degradation of humic acids with sodium perborate. Geoderma, 39: 235-247. Two humic acids of different origin (peat and soil) were degraded with a 5 % sodium perborate solution (140 OC). This degradation process consists mainly of a stoichiometric production of hydrogen peroxide while the perborate is reacting with car...
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ژورنال
عنوان ژورنال: Journal of the American Chemical Society
سال: 2020
ISSN: 0002-7863,1520-5126
DOI: 10.1021/jacs.0c05675