Initiating and Cross-Linking Properties of Urea-Formaldehyde Oligomers with Peroxide Groups

Reaction of formaldehyde with proteins; cross-linking of amino groups with phenol, imidazole, or indole groups.

It has been recognized in recent years that, at elevated temperature or in acid or alkaline solution, formaldehyde can add as methyl01 groups to the amide (1, 2), guanidyl (3-8), and indole groups (9) of proteins. In contrast, the addition product of formaldehyde with amino groups forms instantaneously even at neutrality and low temperatures, but this is an equilibrium reaction and the methyl01...

Chemical cross linking versus high energy electron beam cross linking of HDPE: electrical properties study

Cross linking of high density polyethylene (HDPE) was first performed via high energy10 Mev electron beam (EB) irradiation. HDPE was also cross linked withDicumyle peroxide (DCP).The gel content of samples was determined by solvent extraction.Degree of cross linking was evaluated by hot set apparatus; as well .In order to clarify the effectof nature of cross linking, correlation of electrical p...

Application of Oligomers with Urea Linkage as Flame Retardant and Antibacterial Materials in Jute Fabric

Urea-formaldehyde Adhesive Resins*

Approximately 1 million metric tons of urea-formal-dehyde resin are produced annually. More than 70% of this urea-formaldehyde resin is used by the forest products in-*This information was written and prepared by a U.S. Government employee on official time and it is, therefore, in the public domain and not subject to copyright.

Analysis of chromatin structure by in vivo formaldehyde cross-linking.

Recent advances leave no doubt that higher order chromatin structures play a fundamental role in many developmentally important mechanisms of gene regulation. In particular analyses in genetic model systems like yeast and Drosophila uncovered novel proteins that are involved in the regulation of chromatin structures. Many of these proteins do not bind directly to DNA but interact in large multi...