The structure of urea-formaldehyde (UF) resin was studied in light of the influence of various synthesis parameters on the chemical structure of the resulting resin solutions. The structural variability was analyzed by 13C nuclear magnetic resonance spectroscopy (NMR). Using appropriate pulse ...
The structure of the phenol-containing molecule and the number of phenol rings distinguish different types of epoxy resins. DGEBA (diglycidyl ether of bisphenol-A) is one of the most widely used epoxy resins today. Modifying the ratio of epichlorohydrin to BPA during production can generate high ...
focused on overview of the chemical composition,structure features,extraction and separation methods as well as biological activities and applications of raw lacquer,lacquer polysaccharides,laccases,glycoproteins,lacquer wax(oil),etc.The present problems and ideas on development of lacquer trees were put ...
phenylethylene, or styrene, a clearliquidhydrocarbonwith the chemical structure CH2=CHC6H5. Styrene is polymerized by using free-radical initiators primarily in bulk and suspension processes, althoughsolutionandemulsionmethods are also employed. The structure of thepolymerrepeating unit can be ...
摘要: PROBLEM TO BE SOLVED: To provide a chemical-resistant resin sheet suitable for a lining material of tanks, a reaction vessel, a reaction tank, a reaction tower or the like using an inexpensive material and a continuous manufacturing method and constitution....
Part IV: Structure elucidation of oligomeric molecules Various wet chemical and spectroscopic methods used in lignin chemistry as well as pyrolysis-gas chromatography/mass spectrometry were applied to elucidate... B Scholze,C Hanser,D Meier - 《Journal of Analytical & Applied Pyrolysis》 被引量: ...
The main products of the HSGC-MS analysis of the liquid tar were vanillin, cresols, dihydroeugenol, methoxy- eugenol, trans-isoeugenol and guaiacol forming the non-condensed structure of lignin in the feedstocks. In addition, the presence of p-cresol in the tar is due to high abundance of...
A multiscale model for the synthesis of thermosetting resins: From the addition reaction to cross-linked network formation A multi-scale model that can simulate the influence of the synthetic conditions (e.g., molar ratio) on the structure and physical properties of thermosetti... Li, JingJumpe...
Solvent extraction Oxidation Lignite Extract residue Chemical structure 1. Introduction Solvent extraction and oxidation of coal under mild conditions can be used in order to understand the chemical structure of coal. It can also be used as a means of conversion of low-rank coals into value-added...
1.1 Composition and structure 1.1.1 Composition 1.1.1.1 Chemical composition The chemical composition of a material can be defined as the distribution of the individual components that constitute the material. The material can be a pure substance, which contains only one chemical component; in this ...