Accessibility of fiber surface sites for polymeric additives determines dry and wet tensile strength of paper sheets

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 imagin...

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Bibliographic Details
Published in:Cellulose (London) 2021-06, Vol.28 (9), p.5775-5791
Main Authors: Schäfer, J.-L., Schölch, S., Prucker, O., Brandstetter, T., Rühe, J., Stockert, A. Ritter v., Meckel, T., Biesalski, M.
Format: Article
Language:English
Subjects:
Accessibility
Additives
Bioorganic Chemistry
Butanol
Cellulose fibers
Ceramics
Chemistry
Chemistry and Materials Science
Composites
Copolymers
Glass
Laser applications
Microscopy
Natural Materials
Organic Chemistry
Original Research
Physical Chemistry
Polymer Sciences
Scanning microscopy
Solvents
Spatial distribution
Sustainable Development
Tensile strength
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Summary: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.
ISSN:0969-0239
1572-882X
DOI:10.1007/s10570-021-03817-7