From Thermally Self-Repairing to Stimulus-Responsive Barrier Coatings on Paper using Renewable Polymer Resources, 19PaperCon
In this paper we present novel strategies for biogenic barrier coatings on paper substrates that can restore (“self-repair”) a given (super)hydrophobic property, even after mechanical or thermal impact. Distinct examples will be explained, where fundamental studies were carried-out on functional barrier coatings on paper substrates, which consist of a pre-layer made from fiber immobilized alkyl ketene dimer (AKD) and a top layer consisting of cellulose- and hydroxypropyl cellulose (HPC)-ester, respectively. The procedure of polymer preparation, paper coating as well as extensive characterization of such superhydrophobic coatings on paper will be introduced. Finally, we show examples, where stimulus-responsive functional HPC are being used as coatings, where a hydrophobic surface property of a HPC-ester coated paper can be switched into the reverse, hydrophilic and polar surface by means of light-triggered change in wettability. With these results, in conclusion, we demonstrate that a tailored synthesis of cellulose- and hydroxypropyl cellulose as well as the use of such renewable polymers in coating applications, opens the possibility for a controlled design of functional coatings that can be easily recycled, and thus enhance sustainability in paper products, once transferred into emerging application.
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From Thermally Self-Repairing to Stimulus-Responsive Barrier Coatings on Paper using Renewable Polym