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The influence of different polymers on the aggregation tendency of cellulose microfibril suspension was evaluated with optical microscopy. The aggregation tendency of fibril suspensions was compared with aggregation behavior of surface fibrils on fibers by different polymers. The material properties of fiber bonding domain were evaluated by mechanical testing of model composites of cellulose microfibrils and polymers. Recently developed set-up combining tensile testing, infrared drying, and online moisture sensor was applied to study the polymer effects on the development of sheet tensile strength during drying. The specific interactions between polymers and cellulose fibrils, observed as dispersing and aggregating effects of polymers on cellulose fibrils, reflected both on composite and paper properties. The strength development during drying was specific for different polymers and for different adsorption conditions, which emphasized the physico-chemical function of strength additives. For example, chitosan, adsorbed at high pH, increased the sheet strength throughout the drying range, whereas cationic starch affected the strength only at solids above 80% in the drying sheet.

Paper chemistry: Effect of polymers on aggregation of cellulose fibrils and its implication on strength development in wet paper web