Selektive Cellulosederivatisierung unter heterogenen Reaktionsbedingungen und Strukturaufklärung mit mehrdimensionaler NMR-Spektroskopie

The influence of the phase behavior and of changes of the reaction phase state on the distribution of substituents during different types of cellulose reactions was investigated. New synthesis pathways for cellulose esters, ethers and silylderivatives with high uniformity containing mainly homopolymer structure or copolymer structure were described. The resulting polymers were characterized by two-dimensional n.m.r. spectroscopy. Also in the case of high molecular weight cellulose derivatives (d.p.>1000) high resolved n.m.r. spectra were obtained by suitable sample preparation. It allows the full peak assignment and the quantitative estimation of different anhydroglucose units with different substitution patterns and functional impurities without polymer degradation also in high molecular weight samples. Structure property relations of selected cellulose derivatives were discussed.