Abstract
A sustainable strategy for synergistic surface engineering of lignocellulose and cellulose fibers derived from wood by synergistic combination of metal‐free catalysis and renewable polyelectrolyte (PE) complexes is disclosed. The strategy allows for improvement and introduction of important properties such as strength, water resistance, and fluorescence to the renewable fibers and cellulosic materials. For example, the “green” surface engineering significantly increases the strength properties (up to 100% in Z‐strength) of chemi‐thermomechanical pulp (CTMP) and bleached sulphite pulp (BSP)‐derived sheets. Next, performing an organocatalytic silylation with a nontoxic organic acid makes the corresponding lignocellulose and cellulose sheets hydrophobic. A selective color modification of polysaccharides is developed by combining metal‐free catalysis and thiol‐ene click chemistry. Next, fluorescent PE complexes based on cationic starch (CS) and carboxymethylcellulose (CMC) are prepared and used for modification of CTMP or BSP in the presence of a metal‐free catalyst. Laser‐scanning confocal microscopy reveals that the PE‐strength additive is evenly distributed on the CTMP and heterogeneously on the BSP. The fluorescent CS distribution on the CTMP follows the lignin distribution of the lignocellulosic fibers.
Highlights
A sustainable strategy for synergistic surface engineering of lignocellulose ways of using paper is changing and the most remarkable changes are the use of and cellulose fibers derived from wood by synergistic combination of metalgraphic paper
A sustainable strategy for significantly improving the strength properties and water repellence of sheets made from lignocellulose or cellulose pulps using a synergistic combination of metal-free catalysis and sustainable polyelectrolyte complexes is presented
We found that the properties of the chemi-thermomechanical pulp (CTMP) sheets were significantly improved by the addition of a PE complex made up of cationic starch (CS) and CMC in the presence of an organic α-hydroxy acid catalyst (Table 1)
Summary
A sustainable strategy for synergistic surface engineering of lignocellulose ways of using paper is changing and the most remarkable changes are the use of and cellulose fibers derived from wood by synergistic combination of metalgraphic paper. Cordova and Hafren have shown that the use of catalysis[12] in combination with polysaccharides containing carboxyl groups (e.g., CMC and pectin) can improve the strength properties of cellulose or lignocellulose-based paper sheets by promoting covalent cross-linking and esterification (Figure 1).[13] This biomimetic approach for improvement of fiber-properties can be performed at a multiton scale.[14]
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