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Cross-Linking Cellulosic Fibers with Photoreactive Polymers: Visualization with Confocal Raman and Fluorescence Microscopy

Janko, Marek ; Jocher, Michael ; Boehm, Alexander ; Babel, Laura ; Bump, Steven ; Biesalski, Markus ; Meckel, Tobias ; Stark, Robert W. :
Cross-Linking Cellulosic Fibers with Photoreactive Polymers: Visualization with Confocal Raman and Fluorescence Microscopy.
[Online-Edition: http://dx.doi.org/10.1021/acs.biomac.5b00565]
In: Biomacromolecules, 16 (7) S. 2179-87. ISSN 1525-7797
[Artikel] , (2015)

Offizielle URL: http://dx.doi.org/10.1021/acs.biomac.5b00565

Kurzbeschreibung (Abstract)

The properties of paper sheets can be tuned by adjusting the surface or bulk chemistry using functional polymers that are applied during (online) or after (offline) papermaking processes. In particular, polymers are widely used to enhance the mechanical strength of the wet state of paper sheets. However, the mechanical strength depends not only on the chemical nature of the polymeric additives but also on the distribution of the polymer on and in the lignocellulosic paper. Here, we analyze the photochemical attachment and distribution of hydrophilic polydimethylacrylamide-co-meth-acrylate-benzophenone P(DMAA-co-MABP) copolymers with defined amounts of photoreactive benzophenone moieties in model paper sheets. Raman microscopy was used for the unambiguous identification of P(DMAA-co-MABP) and cellulose specific bands and thus the copolymer distribution within the cellulose matrix. Two-dimensional Raman spectral maps at the intersections of overlapping cellulose fibers document that the macromolecules only partially surround the cellulose fibers, favor to attach to the fiber surface, and connect the cellulose fibers at crossings. Moreover, the copolymer appears to accumulate preferentially in holes, vacancies, and dips on the cellulose fiber surface. Correlative brightfield, Raman, and confocal laser scanning microscopy finally reveal a reticular three-dimensional distribution of the polymer and show that the polymer is predominately deposited in regions of high capillarity (i.e., in proximity to fine cellulose fibrils). These data provide deeper insights into the effects of paper functionalization with a copolymer and aid in understanding how these agents ultimately influence the local and overall properties of paper.

Typ des Eintrags: Artikel
Erschienen: 2015
Autor(en): Janko, Marek ; Jocher, Michael ; Boehm, Alexander ; Babel, Laura ; Bump, Steven ; Biesalski, Markus ; Meckel, Tobias ; Stark, Robert W.
Titel: Cross-Linking Cellulosic Fibers with Photoreactive Polymers: Visualization with Confocal Raman and Fluorescence Microscopy
Sprache: Englisch
Kurzbeschreibung (Abstract):

The properties of paper sheets can be tuned by adjusting the surface or bulk chemistry using functional polymers that are applied during (online) or after (offline) papermaking processes. In particular, polymers are widely used to enhance the mechanical strength of the wet state of paper sheets. However, the mechanical strength depends not only on the chemical nature of the polymeric additives but also on the distribution of the polymer on and in the lignocellulosic paper. Here, we analyze the photochemical attachment and distribution of hydrophilic polydimethylacrylamide-co-meth-acrylate-benzophenone P(DMAA-co-MABP) copolymers with defined amounts of photoreactive benzophenone moieties in model paper sheets. Raman microscopy was used for the unambiguous identification of P(DMAA-co-MABP) and cellulose specific bands and thus the copolymer distribution within the cellulose matrix. Two-dimensional Raman spectral maps at the intersections of overlapping cellulose fibers document that the macromolecules only partially surround the cellulose fibers, favor to attach to the fiber surface, and connect the cellulose fibers at crossings. Moreover, the copolymer appears to accumulate preferentially in holes, vacancies, and dips on the cellulose fiber surface. Correlative brightfield, Raman, and confocal laser scanning microscopy finally reveal a reticular three-dimensional distribution of the polymer and show that the polymer is predominately deposited in regions of high capillarity (i.e., in proximity to fine cellulose fibrils). These data provide deeper insights into the effects of paper functionalization with a copolymer and aid in understanding how these agents ultimately influence the local and overall properties of paper.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Biomacromolecules
Band: 16
(Heft-)Nummer: 7
Verlag: American Chemical Society
Fachbereich(e)/-gebiet(e): 10 Fachbereich Biologie
10 Fachbereich Biologie > Membrane Dynamics
11 Fachbereich Material- und Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Physics of Surfaces
Profilbereiche
Profilbereiche > Thermo-Fluids & Interfaces
Exzellenzinitiative
Exzellenzinitiative > Exzellenzcluster
07 Fachbereich Chemie
07 Fachbereich Chemie > Fachgebiet Makromolekulare Chemie
Zentrale Einrichtungen
Hinterlegungsdatum: 28 Jul 2015 09:58
Offizielle URL: http://dx.doi.org/10.1021/acs.biomac.5b00565
Sponsoren: In addition, we gratefully acknowledge the Center of Smart Interfaces of the Technische Universitat Darmstadt for financial support., M.B. acknowledges financial support from the Verband der Deutschen Papierindustrie (VDP) within the INFOR programme (MAP NV164) and from the Bundesministerium fur Wirtschaft und Energie (BMWi) under AiF-IGF-grant no. 17919N "PhoreNast".
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