PAPER making! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL FROM THE PUBLISHERS OF PAPER TE Volume 7, Number 2, 2021
Accessibility of fiber surface sites for polymeric additives determines dry and wet tensile strength of paper sheets J.-L. Schäfer, S. Sch ö lch, O. Prucker, T. Brandstetter, J. Rühe, A. Ritter v. Stockert, T. Meckel & M. Biesalski This contribution focuses on understanding of paper wet-strength properties, by taking a closer look at the spatial distribution of wet-strengthening polymers inside the cellulosic fiber network deposited under different treatment conditions using confocal laser scanning microscopy as in situ imaging tool. We compare the behavior of paper samples treated with a photochemically cross-linkable copolymer using an impregnation process employing three different solvents, namely water, 2-propanol (IPA) and 1-butanol (BuOH), respectively. As these solvents swell paper fibers to quite different extents, the deposition of the polymer, on, in or in-between the cellulosic fibers varies quite strongly, as is shown by in-depth analysis using confocal laser scanning microscopy. The difference in accessibility of distinct surface sites exclusively on or also in and between the fibers controls the macroscopic tensile strength under both dry and wet conditions. Contact information: J.-L. Schäfer, A. R. v. Stockert, T. Meckel & M. Biesalski: Department of Chemistry, Macromolecular Chemistry & Paper Chemistry, Technical University Darmstadt, Alarich-Weiss-Straße 8, 64287 Darmstadt, Germany S. Sch ö lch, O. Prucker, T. Brandstetter & J. Rühe: Department of Microsystems Engineering (IMTEK), Laboratory for Chemistry & Physics of Interfaces, Albert-Ludwigs-Universita¨t Freiburg, Georges-Ko¨hler- Allee 103, 79110 Freiburg, Germany Cellulose (2021) 28:5775 – 5791
https://doi.org/10.1007/s10570-021-03817-7 Creative Commons Attribution 4.0 International License
The Paper Industry Technical Association (PITA) is an independent organisation which operates for the general benefit of its members – both individual and corporate – dedicated to promoting and improving the technical and scientific knowledge of those working in the UK pulp and paper industry. Formed in 1960, it serves the Industry, both manufacturers and suppliers, by providing a forum for members to meet and network; it organises visits, conferences and training seminars that cover all aspects of papermaking science. It also publishes the prestigious journal Paper Technology International and the PITA Annual Review , both sent free to members, and a range of other technical publications which include conference proceedings and the acclaimed Essential Guide to Aqueous Coating .
Article 9 – Polymeric Strength Additives
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