Synthesis of a new kind of carbohydrate-modified polysiloxanes and its morphological transition of molecular aggregates in water

Allylamides of gluconic acid were synthesized by the reaction of allylamine with lactones using dimethyl formamide as a solvent. In this reaction, hydroxyl groups were protected by trimethylsilyl groups via three different pathways that connect sugar units onto the polysiloxane chains. A series of well-defined polysiloxanes with pendent sugar units were prepared by hydrosilation of the trimethylsilyl-protected allylamides with hydric polysiloxanes in the presence of the Platinum dioxide as a catalyst. The catalytic activity and selectivity were discussed in detail. All products were characterized by FT-IR, 1H NMR, and 13C NMR spectroscopy, respectively. Furthermore, the shapes of molecular aggregates of target polymers in water were studied by transmission electron microscopy, which reveals that the transitions of micelles- morphologies from spheres to vesicles can be controlled by adjusting hydrogen content of primary materials or by changing initial solvents.