Grafted Copolymerization Modification of Hemicellulose Directly in the Alkaline Peroxide Mechanical Pulping (APMP) Effluent and Its Surface Sizing Effects on Corrugated Paper

Abstract

In this work, the graft copolymerization of acrylamide (AM) and methacryloyloxy ethyl trimethyl ammonium chloride (DMC) with the hemicellulose in the alkaline peroxide mechanical pulping (APMP) effluent was investigated using the Fenton agent (FeSO 4 /H 2 O 2 ) as an initiator. The effects of the reaction conditions on the characteristics of the graft copolymers were studied. On the basis of the graft copolymer characterization, the optimum conditions were as follows: total active ingredient concentration 31%, reactive temperature 50°C, amount of the initiator 0.4%, ratio of H 2 O 2 to FeSO 4 1:1, molar ratio of DMC to AM 1.5:20 and optimum percentages of C, G, GE, and viscosity are 65%, 246%, 98%, and 5020 cP, respectively. Structure elucidation of the graft copolymer was obtained by 1 H NMR spectroscopy and FT-IR. Gel-permeation chromatography (GPC) was employed to determine the molecular mass and molecular mass distribution of hemicellulose and graft copolymer. The thermal degradation properties of hemicellulose and the graft copolymers were measured by thermo gravimetric analysis (TGA). The graft copolymer was subsequently used as a corrugated paper surface sizing agent, which can significantly improve the physical strength and water resistance of corrugated paper.

Preventing Water-Induced Mechanical Deterioration of Cardboard by a Sequential Polymer Treatment

“…24 Another strategy to increase the physical strength and water resistance of corrugated paperboards is based on innovative industrial sizing procedures performed, for example, with grafted copolymers. 25 Natural sizing ingredients such as lignin have also been adopted to enhance the strength, air permeability, and hydrophobicity of the cardboard layers. 12 Recently, sequential or double polymer treatments have been shown to be quite effective in improving oil migration barrier characteristics of paperboards.…”

Hydrophobic copolymers added with starch at the size press of a paper machine: A review of findings and likely mechanisms

“…As in the case of wet-end rosin sizing, the rosin was combined with aluminum sulfate, which served as an anchor for the rosin after drying of the paper. As already noted, Dong et al (2014) showed that increased hydrophobicity could be achieved by size press addition of wood extractives isolated from alkaline peroxide mechanical pulping effluent; it was postulated that the effects were largely due to fatty acids and their interactions with alum. Results are consistent with similar effects that have been achieved with alum and fatty acids added to the papermaking furnish (Gaiduchenya 1973).…”

Emulsion Polymers of Carboxymethyl Cellulose and Methyl Methacrylate with Tetrabutylammonium Hydroxide Surfactant as Soil Stabilizer

“…This is likely due to the copolymerization reaction of -(methacryloxypropyl) trimethoxy silane with styrene and butadiene that obstructs the association of the styrene/butadiene/ -(methacryloxypropyl) trimethoxy silane molecular chains. In another study conducted by Dong et al on graft copolymerization modification of hemicellulose in the alkaline peroxide mechanical pulping, the viscosity of the graft copolymerization product rises with increasing concentration of the total active ingredients [28]. This phenomenon is ascribed to a higher monomer concentration that prompts the formation of multiple radical sites.…”