Date of Award
Bachelor of Science
Paper Science and Engineering
Greater improvements in dry strength values can be obtained by maintaining the system's pH at the pH of precipitation formation, pHp. By using the pHp as the system's pH, more aluminum can be adsorbed onto the fibers. With more aluminum adsorbed onto the fibers, there are more possible interaction sites for the polyacrylamide to be fixed between the fibers; and thereby give a higher dry strength response.
An optimum level of polyacrylamide, .5% based on dry fiber,· was used in achieving maximum dry strength effectiveness. When the order of addition of the rosin, aluminum species, and polyacrylamide system was varied, no significant differences in dry strength results were apparent.
McKeel, Sally A., "Impact of Aluminum Chemistry and Order of Addition on Anionic Polyacrylamide Dry Strength Resins" (1983). Paper Engineering Senior Theses. 318.