Acrylamide was grafted in low density polyethylene during melt processing in the presence of a free radical initiator using a torque rheometer in a closed system. Effects of processing time, acrylamide and benzoyl peroxide concentrations were studied. FTIR studies revealed that the degree of grafting increased by an increase in acrylamide concentration. Maximum grafting was obtained at 7 mi...

S-(1-Oxido-2-pyridinyl)-1,1,3,3-tetramethylthiouronium hexafluorophosphate (HOTT) facilitates the first examples of efficient radical cyclisation with (hetero)aromatic substitution via Barton ester intermediates. Cyclopropyl and alkyl radicals allow access to five, six and seven-membered alicyclic-ring fused heterocycles with and without an additional fused cyclopropane, including the skeleton ...

In this study, we demonstrated an oxidative method with free radical to generate 3,5,4'-trihydroxy-trans-stilbene (trans-resveratrol) metabolites and detect sequentially by an autosampler coupling with liquid chromatography electrospray ionization tandem mass spectrometer (LC-ESI-MS/MS). In this oxidative method, the free radical initiator, ammonium persulfate (APS), was placed in a sample bott...

Free radicals in polymers are produced during synthesis and interaction with catalysts, initiator of chemical reactions, fillers, stabilizers, and other substances which as chemically or physically active remain dissolved in condensed phase of final product. Also γ irradiation causes both immediate and time dependent changes which arise from the presence of long living free radicals. The free r...

High yield photolytic reduction of a series of thiaphosphoranes Z p SR to give Z p H with UV-light-induced tri-n-butyltin hydride through phosphoranyl radical Z p is described. This reaction is inhibited by a-methylstyrene and initiated by a radical initiator such as azobisisobutyronitrile

Photolysis of dibenzyl ketone derivatives adsorbed on ZSM-5 zeolites produces persistent benzyl radicals (initiator radicals), which add to methyl acrylates (monomers) to generate persistent adduct radicals. Both initiator and adduct radicals are readily observable by conventional steady-state EPR spectroscopy at room temperature and are persistent for time periods ranging from seconds to many ...

Acrylate grouting material has been widely used in dams, tunnels and other underground buildings. This paper introduces the basic components of acrylate grouting material, then the reaction mechanism and dynamics of gelation process are discussed based on the theory of free radical polymerization. By measuring the relationship between gelation time and the concentration of initiator ammonium pe...

Polymethylmethacrylate-graphene (PMMA/RGO) nanocomposites were prepared via in situ bulk polymerization using two different preparation techniques. In the first approach, a mixture of graphite oxide (GO) and methylmethacrylate monomers (MMA) were polymerized using a bulk polymerization method with a free radical initiator. After the addition of the reducing agent hydrazine hydrate (HH), the pro...

Back Cover: In article 2300005, Keling Hu, Yongjun Zhang, and co-workers demonstrate an organocatalyzed living radical polymerization method for high molecular weight polymers (HMWPs), yielding well-defined HMWPs in a metal-free sulfur-free manner. This technique is rather mild crucial eliminating the persistent effect dramatically improving livingness of propagation radicals, enabling without ...