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1 Water Soluble Polymers for Paper Strength Li Zhu Department of Chemical Engineering McMaster University, Hamilton, Ontario, Canada
2 Outline u Introduction u Dry strength resins u Wet strength resins
3 Cellulose Structure REF. Pulp and Paper. Chemistry and chemical Technology Vol. I
4 Hydrogen Bonds
5 Dry Strength Resin--- Starch u Glucose units
6 Cationic Starch
7 Cationic PAM
8 Conclusion---I u Dry strength resin should contain: D Cationic charges D H-bonding potential.
10 Wet--- Urea Formaldehyde Resin
11 Melanine Formaldehyde Resin
13 Wet Strength Enhancing Ref. Charles E. Farley, wet-strength resin and application, Chapter 3
14 Cationic Aldehyde Starch
15 Conclusion---II u Wet strength resin should be able to: D Homo-crosslinking D Covalent bonding with fibers
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