Date of Award


Degree Name

Bachelor of Science


Pulp and Paper Technology


An attempt is made herein to compare the efficiency of commercially available cationic starches and those prepared in the laboratory using a pearl corn starch and different cationic resins. The efficiency of each is determined through evaluation of the resulting wet-web strength and dry strength tests. Results show that cationic starches can be prepared in the mill and comparable strengths are obtained with their use.

It has long been known that cellulose developes a negative charge from the carboxyl groups when dispersed in water. The same effect is found when starch is diluted in water. Wet end addition of starch has been proven to improve the strength of the resulting mat of fibers. This strength improvement results mainly from the entanglement of the fibers and starch molecules. The retention of starch in this type of system is very poor.1