Paper engineered with cellulosic additives: effect of length scale
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Composites of cellulose fibers were made with paper-making technology. Two types of microfibrillated cellulose (MFC), obtained by with either homogenization or ball milling, were blended with hardwood fibers to give composites having high strength and low air permeability. The strengthening effects of the MFCs were compared with strengthening by cellulose microparticles (CMPs) made by cryogenic milling, with and without polyamideamine-epichlorohydrin addition. The MFC from homogenization was fully retained on the fiber web due to a broad size distribution; in contrast, the retention ratio for MFC produced by ball milling was lower than 50 % because of its smaller particle size. The small size caused the resulting paper to display a more compact and denser structure. The main distinction between the papers made with the two types of MFC was the elongation at break under wet conditions, suggesting that they reinforce the paper in different ways. On the other hand, CMPs act as mechanical debonders and could find application in tissue paper, increasing paper bulk and decreasing the density and thus improve tissue softness.
KeywordsMFC Polymer Paper Composite Permeability Strength
The financial contribution of Australian Research Council (LP0990526), Visy and Nopco paper technology is acknowledged. Thank to Dr. W.K.J. Mosse, P. Chandran and I. Stopka for the cellulose micro-particles, Professor X. Wang and Associate Professor T. Tsuzuki from Deakin University for providing cellulose nanofibrils, and S. Sharman, S. Varanasi, S. Narayanan and H. Chiam for technical help.
- Espy HH (1995) The mechanism of wet-strength development in paper—a review. Tappi J 78(4):90–99Google Scholar
- Niskanen K (1998) Papermaking science and technology: paper physics, Book 16. Fapet Oy, Helsinki Google Scholar
- Seth RS (1995) The effect of fiber length and coarseness on the tensile-strength of wet webs—a statistical geometry explanation. Tappi J 78(3):99–102Google Scholar
- Su JL, Mosse WKJ, Sharman S, Batchelor W, Garnier G (2012) Paper strength development and recyclability with polyamideamine-epichlorohydrin (PAE). Bioresources 7(1):913–924Google Scholar
- Yoon SH (2006) Adsorption kinetics of polyamide-epichlorohydrin on cellulosic fibres suspended in aqueous solution. J Ind Eng Chem 12(6):877–881Google Scholar