Results 241 to 250 of about 49,564 (298)

Oxidative Depolymerization of Polyphenylene Oxide into Benzoquinone

ChemSusChem, 2023
AbstractPoly(2,6‐dimethyl‐1,4‐phenylene oxide) (PPO) is one of the most important engineering plastics commonly utilized in various fields. Herein, chemical recycling of PPO was performed via oxidative depolymerization to form 2,6‐diemthyl‐p‐benzoquionone (26DMBQ) as a sole aromatic product in 66 % yield using nitronium ions (NO2+) as a mild oxidant ...
Yoshihiro Shimoyama, Yumiko Nakajima
openaire   +2 more sources

Anil formation by oxidative depolymerization

Journal of the Chemical Society, Chemical Communications, 1973
Mixtures of substituted anilines and oligomers of poly-(2,6-dimethyl-1,4-phenylene) ether in benzene were oxidized by sodium bismuthate to give anils such as 2,6-dimethyl-p-benzoquinone-4-(2′,4′,6′-trimethyl)anil, a product of oxidative depolymerization.
Emil Kon, Edward McNelis
openaire   +1 more source

Periodate oxidized alginates: Depolymerization kinetics

Carbohydrate Polymers, 2011
Abstract Limited periodate oxidation (0–8%) of alginates results in enhanced degradability, extending the range of applications of alginates as biomaterials, e.g. in tissue engineering. Oxidation produces dialdehydes that are highly sensitive to alkaline β-elimination, even under physiological conditions (pH 7.4, 37 °C).
Kåre A. Kristiansen, Henrik Berg Tomren, Bjørn E. Christensen   +2 more
openaire   +1 more source

Depolymerization of oxidized bituminous coals

Fuel, 1974
Abstract Certain high-sulphur-containing, high-volatile bituminous (hvb) coals have been converted into products which are almost completely soluble in chloroform. These products were obtained by a series of reactions involving initial oxidation with 2N nitric acid, depolymerization with boron trifluoride-phenol, and acetylation.
Larry J. Darlage, J.P. Weidner, S.S. Block   +2 more
openaire   +1 more source

Depolymerization of lignin by wet air oxidation

Bioresource Technology Reports, 2020
Abstract In the present study, effect of temperature (150–250 °C) and pressure (500–1500 psi) was investigated for depolymerization of lignin by wet air oxidation (WAO). Commercial alkali lignin was used as representative lignin material. The degradation/oxidation products of WAO treatments were identified to understand the potential value of the ...
Sibel Irmak, Juhyon Kang, Mark Wilkins
openaire   +1 more source

Oxidative Depolymerization of Lignin in Ionic Liquids

ChemSusChem, 2010
AbstractBeech lignin was oxidatively cleaved in ionic liquids to give phenols, unsaturated propylaromatics, and aromatic aldehydes. A multiparallel batch reactor system was used to screen different ionic liquids and metal catalysts. Mn(NO3)2 in 1‐ethyl‐3‐methylimidazolium trifluoromethanesulfonate [EMIM][CF3SO3] proved to be the most effective reaction
Kerstin, Stärk, Nicola, Taccardi, Andreas, Bösmann, Peter, Wasserscheid   +3 more
openaire   +2 more sources

Sulphite and oxidative—reductive depolymerization reactions

Food Chemistry, 1997
Abstract Addition of sulphite at levels between 0.004 and 1% helps to protect the water soluble neutral polysaccharide guar gum from thermal degradation. The greater the amount of sulphite incorporated the more viscous the guar is post-retorting. Starch granules, from a wide range of sources, swell when heated in excess water.
Lorna A. Paterson, Sandra E. Hill, John R. Mitchell, John M.V. Blanshard   +3 more
openaire   +1 more source