How copper corrosion can be retarded--New ways investigating a chronic problem for cellulose in paper

Abstract

To better assess the stabilization effects of chemical treatments on Cu(II)-catalyzed cellulose degradation, we developed Cu(II)-containing model rag paper with typical copper corrosion characteristics using e-beam radiation. The paper can be prepared homogeneously and quickly compared to tedious pre-aging methods. Using the Cu(II)-containing model rag paper, the stabilization effects of various chemicals on Cu(II)-catalyzed degradation of cellulose were tested. Benzotriazol was highly effective in retarding the degradation of the Cu(II)-containing model rag paper under hot and humid aging condition, as well as under photo-oxidative stress. Tetrabutylammonium bromide reduced Cu(II)-catalyzed degradation of cellulose, but its efficacy was dependent on the accelerated aging conditions. The results with the alkaline treatments and gelatin treatment suggested that their roles in the degradation mechanisms of cellulose in the presence of Cu(II) differ from those of benzotriazol and tetrabutylammonium bromide.

Keywords: Accelerated aging; Benzotriazol (PubChem CID: 7220); Calcium hydrogen carbonate (PubChem CID: 10176262); Calcium phytate (PubChem CID: 24495); Copper-catalyzed degradation of cellulose; E-beam; Ethyl-p-hydroxybenzoate (PubChem CID: 8434); GPC; Magnesium hydrogen carbonate (PubChem CID: 102204); Rag paper; Stabilization; Tetrabutylammonium bromide (PubChem CID: 74236).