Abstract
Corn starch was selectively oxidized by sodium meta periodate to afford dialdehyde starch of which degree of oxidation was 92.1%.
The reactions of the dialdehyde starch with urea in various conditions were studied.
It was found that 0.12 moles of urea were added to the dialdehyde starch even in pH 2.6 at 25-30°C within three hours, and that a maximum of 0.44 moles of urea was added at 55-60°C. The extent of reaction of urea was not more than one mole in other conditions of reaction.
The reaction products are high polymers carrying a number of both aldehyde and amide groups along, the molecular chain. They are hoped for many interesting applications in paper industry. The investigations are now continuing in our laboratory.
