Results 261 to 270 of about 49,564 (298)

Oxidative chemical depolymerization of thermoset epoxy resin for green recycling

Journal of Industrial and Engineering Chemistry, 2021
Abstract Carbon-fibre-reinforced plastics (CFRPs) have been widely used in many fields, which has inevitably resulted in the production of large amounts of waste composites. Therefore, the recycling of high-value carbon fibres has become a topic of great interest.
Doo Hun Kim, Ayeong Yu, Munju Goh
openaire   +1 more source

Chemical change involved in the oxidative-reductive depolymerization of heparin

Carbohydrate Research, 1992
A solution of hog intestinal heparin (average M(r) 12,000, anti-clotting activity 168 USP units/mg) in 0.2 M phosphate buffer (pH 7.2), was incubated in the presence of Fe2+ for 20 h at 50 degrees under an O2 atmosphere to yield oxidative-reductively depolymerized heparin (ORD heparin, average M(r) 3,000, anti-clotting activity 34 USP units/mg ...
K, Nagasawa, H, Uchiyama, N, Sato, A, Hatano   +3 more
openaire   +2 more sources

TOWARDS CATALYTIC OXIDATIVE DEPOLYMERIZATION OF LIGNIN

2016
Lignin is one of the most abundant and underutilized biopolymers on earth. Primarily composed on three monolignol units (sinapyl, coniferyl, and p-coumaryl alcohol), lignin is formed through a radical pathway resulting in an assortment of linkages, of which the β-O-4 linkage is the most prevalent (up to 60% in some hardwood species).
openaire   +1 more source

Application of the oxidative induction test to depolymerizing systems

Thermochimica Acta, 2001
Abstract Since the development of the oxidative induction time (OIT) test by former Bell Telephone Laboratories researchers, there have been many studies to broaden its applicability to polymers beyond the original polyolefins. The basic premise in OIT studies is that a detectable oxidation onset is based on the differential reactivity between the ...
Lecon Woo, Atul Khare, Henk P. Blom, Craig Sandford, Samuel Y. Ding   +4 more
openaire   +1 more source

Depolymerization of lignin by catalytic oxidation with aqueous polyoxometalates

Applied Catalysis A: General, 2013
Abstract In this work a method for the depolymerization of lignin by catalytic oxidation was studied. Using H 5 PMo 10 V 2 O 40 as the catalyst, various lignin spices including pyrolytic lignin, hydrolytic lignin, alkali lignin, sodium lignosulfonate and calcium lignosulfonate were tested for the oxidative degradation.
Yan Zhao, Qing Xu, Tao Pan, Yong Zuo, Yao Fu, Qing-Xiang Guo   +5 more
openaire   +1 more source

The Depolymerization of Lignin via Aqueous Alkaline Oxidation

1993
Lignins derived from fractionation processes (organosolv or steam/aqueous technologies) are, by all standards, rather “pure” lignins and their use as feedstock for conversion into low molecular weight phenolics has prompted renewed research interest. Several conversion strategies are possible. Among them pyrolysis, hydrocracking, hydrolysis and partial
G. Wu, M. Heitz, E. Chornet
openaire   +1 more source

A comparative study of secondary depolymerization methods on oxidized lignins

Green Chemistry, 2019
DDQ oxidized lignins were used as substrates to assess the effectiveness of secondary depolymerization methods for the production of aromatics.
Yang Song, Ali Hussain Motagamwala, Steven D. Karlen, James A. Dumesic, John Ralph, Justin K. Mobley, Mark Crocker   +6 more
openaire   +1 more source

Oxidative Depolymerized Nanocelluloses for Pickering Emulsion

Proceedings of the Virtual 2021 AOCS Annual Meeting & Expo, 2021
Li Ziqian, Oliver Bogojevic, Zheng Guo
openaire   +1 more source

Mechanochemical Treatment Facilitates Two-Step Oxidative Depolymerization of Kraft Lignin

ACS Sustainable Chemistry & Engineering, 2018
Mechanochemical treatment of Indulin AT kraft lignin by ball-milling with KOH and toluene produces significant carbonyl functionality, among other changes. The chemical reactivity of the lignin is increased, resulting in greater lignin degradation from porphyrin oxidation followed by Baeyer–Villiger oxidation.
Soledad G. Yao, Justin K. Mobley, John Ralph, Mark Crocker, Sean Parkin, John P. Selegue, Mark S. Meier   +6 more
openaire   +1 more source

Oxidative Depolymerization of Lignin to Low Molecular Weight Aromatics

2019
To date, most lignocellulosic biorefinery strategies have focused on optimizing conversion of cellulose to ethanol, leaving lignin as an underutilized biomass constituent. Lignin is engineered by nature with the intent to protect plants from chemical and biological attack; this leaves lignin with high structural irregularity and recalcitrance ...
openaire   +1 more source