Sugar Silicone Polymer Synthesis And Solution Properties

Allylamides of gluconic acid were synthesized by the reaction of allylamine with lactones using dimethyl formamide as a solvent, and their .hydroxyl groups were protected by trimethylsilyl groups in three different pathways for the following connection of sugar units onto polysiloxane chains through them. A series of well-defined polysiloxanes with pendent sugar units were prepared by hydrosilylation 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.After equilibrating perhydrous silicone oil with octamethylcyclotetrasiloxane and hexamethyldisiloxane while sulfuric acid act as a catalyst. The hydrogen of silicone oil could be varied from 0 up to 100%, and the molecular weight of the containing hydrogen silicone oil can also be varied from 3000 g mol^-1 up to 12000 g mol^-1.Hydrosilation addition is the most important process for preparing carbohydrate modified PDMS. But it is difficult to find a suitable catalyst in this reaction because the amino groups do poison to the common Speier's catalyst. After testing large variety of Karstedt catalyst and complexes of transition metal ions such as (Et₂S) PtC12, Platinum dioxide and bis(1,5-cyclooctadiene)dirhodium dichloide et al to prepare several kinds of aminopropyl polysiloxane-base polymer, it was showed that Platinum dioxide was also an effective catalyst in the reaction with a yield almost one hundred percent (100%) according to the ¹H-NMR of crud product, without induction period, and the remanent catalyzer could be easily reclaimed by filtration.Though trimethylsiyl group is widely used in the protection of hydroxyl groups, it is still difficult to keep conformations of the sugar units during cleaving the...