Interaction of industrially relevant cationic starches with cellulose
Industrially relevant, commercially available cationic starches have been investigated towards their interaction capacity with cellulose thin films derived from trimethylsilyl cellulose (TMSC). The starches used in this study stem from different sources (potato, pea, corn) and featured rather low degrees of substitution ranging from 0.030 to 0.062. The interaction of those starches with cellulose thin films was studied by surface plasmon resonance spectroscopy under flow conditions using concentrations of 1.0 mg ml−1 and a flow rate of 25 μl min−1. All the investigated starches employed in this study were capable to efficiently interact with the slightly negatively charged cellulose surface leading to irreversible deposition on the surface. As complementary techniques atomic force microscopy and x-ray photoelectron spectroscopy were used to confirm the presence of the starches on the cellulose film surface. Further, dynamic light scatteringand size exclusion chromatography measurements were performed to correlate adsorbed amount, particle size and molecular weight of the starches to their interaction behavior.
a – Graz University of Technology, Institute for Paper, Pulp and Fiber Technology, Inffeldgasse 23A, 8010 Graz, Austria
b – CD-Laboratory for Fibre Swelling and Paper Performance, Inffeldgasse 23A, 8010 Graz, Austria
c – Graz University of Technology, Institute for Inorganic Chemistry, Stremayrgasse 9, 8010 Graz, Austria
d – Graz University of Technology, Institute for Chemistry and Technology of Materials, Stremayrgasse 9, 8010 Graz, Austria
e – University of Leoben, Chair of Polymeric Materials, Otto-Glöckl-Strasse 9, 8700 Leoben, Austria
f – Mondi Uncoated Fine & Kraft Paper GmbH, Marxergasse 4A, 1030 Wien, Austria