Radiation induced changes in the structure of CIS-1, 4-polybutadiene
Abstract The processes occurring during electron irradiation of cis-polybutadiene have been investigated. The concentration of unsaturated bonds decays during irradiation with the formation of intermolecular crosslinks, intramolecular cyclic structures and polyene groups. The decay processes can be described by equations which approximate to first order kinetics. Rate constants for the decay processes have been estimated from the experimental data.
Finding environmentally gentle methods to graft Lewis acid on the surface of mesoporous materials is a topic of current interest. Herein we describe the optimization of a preparation procedure of a mesoporous silica-supported ErIII catalyst using the microwave-assisted post-calcination functionalization of Mobil Composition of Matter-41 silica as the key step. The required time for functionalization was reduced from several hours to 10 min using sealed-vessel microwave technology. Control experiments using conventional heating at the same temperature demonstrated that the rate increase is owing to a simple thermal/kinetic effect as a result of the higher reaction temperature. The resulting ErIII catalyst was tested for the first time as a catalyst in the continuous flow deprotection of benzaldehyde dimethylacetal and a complete leaching study was performed.